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TasunkaWitko
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| Posted: 10 September 2007 at 14:11 | IP Logged
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comments from www.handloadersbench.com:
http://www.handloadersbench.com/forum5/3184.html
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TasunkaWitko - Chinook, Montana
Helfen, Wehren, Heilen
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Joe in KY
.22 LongRifle
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| Posted: 15 September 2007 at 13:51 | IP Logged
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Hi everyone, I just found this forum. Seems like there are quite a few 7x57 fans here. I have owned a couple of them over the years and have only used bullets in the 130 to 145 gr range. I like the 145 Speer BTs the best. I am have a rifle built in 7x57 and have been looking at various bullets and it looks like I have been limiting myself way too much, the 160s especially the Hornady SSTs and A-Max bullets look real good on paper. Joe in KY
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Guests
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Welcome Joe, Lots of good info here, welcome to the site, feel free to jump in and enjoy.
Rick
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TasunkaWitko
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| Posted: 17 September 2007 at 13:41 | IP Logged
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bad weekend for testing loads - i was going to
test my handloaded 7x57 rounds sunday morning, but the
breeze was such that i decided against it, especially
since i do not have a gun vise/rest and would be
relying on blankets and ammo cans.
the "breeze" eventually developed steadily into quite a fine
north-central montana windstorm, with clouds of dirt
and dust moving along about as fast as the cars on the
highway.
i am hoping for
some more congenial weather next week; or, at least not
as much wind.
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TasunkaWitko - Chinook, Montana
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Joe in KY
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| Posted: 20 September 2007 at 01:15 | IP Logged
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I have ordered a 1:8.66 twist barrel for my 7x57 project. I plan on shooting heavier bullets most of the time what is the lightest bullet any of you have found to be accurate with this twist? thanks Joe
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TasunkaWitko
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I finally have some new information and a range report. The weather today in north-central Montana was about as beautiful as can be this time of year. No wind, nice temperature and clear skies. As a reminder, here is what we had:
- Rifle – CZ M550 American (7x57)
- Scope - Sightron S1 (3-9x40mm)
The ammunition being tested was loaded as follows:
- Winchester brass
- CCI primers (standard)
- Hornady 139-grn PSPs (flat base)
- 5 rounds of each load (see below)
When we got out there, two high school kids were sighting in and doing a good job of it. The range has only two "lanes," so we waited a while and got ready while they finished up. After they left, we set up targets at 100 yards and proceeded.
We shot a total of six 5-shot groups with at least one minute between shots and at least 5 minutes between groups. The barrel did get warm, but not hot. The bore was slightly fouled but not dirty.
For Christmas, I am definitely asking for a rifle rest or vise. As it was, I had a standard gun cradle for cleaning and mounting scopes. It worked well as a rest for holding the rifle reasonable steady, but it was impossible to set at a particular height and there was way to hold it tight in place. I ended up setting the front end on a folded jacket and managed to get it close to the height I wanted, and then held on-target from there. As a consequence, conditions were a little better than off hand, not nearly as good as bench rest. Perhaps a decent approximation of field conditions using a backpack or some similar informal rest? In any case, all measurements below should be taken with a small grain of salt, since they were not under “perfect” conditions.
While we were there, a father and his high school-aged daughter also came out to sight in her .243 for opening day. They were having a good time and it was nice to see a young lady participating in our sport.
Results were as follows (groups are measured from edge-to-edge at widest point, not center-to-center – 7mm translates to .275 inches, which should be subtracted from each group):
IMR 4064
- 38 grns – One shot missed the target, leaving a wide four-shot group measuring 3.05 inches (net - 2.775 inches). The “center” of the group was approximately ¾ inch above and 1¼ inches to the right of the bull’s eye. One case ended up with a split neck for unknown reasons.
- 39 grns – All five shots hit the target in a group measuring 2.61 inches (net - 2.335 inches). The “center” of the group was approximately ¾ inch above and 1 & 1/8 inches to the right of the bull’s eye. Were it not for a flier, the group would have been 1.89 inches (net - 1.615 inches)with the “center” ¾ inch high and ½ inch to the right of the bull's eye.
- 40 grns – All five shots hit the target in a nice group measuring 1.75 inches (net - 1.475). The “center” of the group was approximately 1½ inches above and ½ of an inch to the right of the bull’s eye. This group was interesting in that it was actually 2 groups; a three-shot group 1½ inches above the bulls eye measuring .74 inches (net - .465 inches) and a second group of two shots nearly through the same hole and about an inch to the right. It seemed to me to ultimately be the best group of all.
IMR 4831
- 44 grns – All five shots hit the target in an erratic group measuring a full six inches across, with an apparent flier at each end, left and right. The “center” of the overall group was a nice little group of three shots (almost a cloverleaf) measuring .71 inches (net - .435 inches) and placed approximately 1¼ inches below and 1/3 of an inch to the left of the bulls eye. This load certainly bears more attention in order to find out whether the fliers were shooter error or a problem with the load.
- 45 grns - This group was tainted by all kinds of misery. During the third shot, the rifle discharged as yours truly was switching off the safety with his finger on the trigger (which is quite sensitive!). This provided the kids with a visual lesson on rifle safety as well as range safety. STAY BEHIND THE FIRING LINE! Anything can happen. As a further complication, one shot missed for whatever reason. This left us with a three-shot group measuring 1.37 inches (net 1.095 inches). The center of the group was approximately 1/8 of an inch below and ¾ of an inch to the right of the bull’s eye. Without the miss and the accidental discharge, this might have been a decent group, but there is no way to know for sure.
- 46 grns – one shot missed the target, leaving a box-shaped four-shot group measuring 2.34 inches (net - 2.065 inches). The “center” of the group was approximately 1 inch to the right and ½ of an inch below the bull’s eye.
Conclusions: Even though there was no completely secure rest, the fact remains that conditions were more-or-less the same for all six groups. With that in mind, the 40 grains of IMR 4064 seem to have performed the best and I will be using that for hunting this year. Having seen a “pretty darn good” group with it, and considering that it lands with very good consistency an inch-and-a-half above the bull’s eye at 100 yards, I have high confidence that it will perform well. Obviously, some tweaking will be necessary in the future, but all things considered, this looks good.
Edited by TasunkaWitko on 15 October 2007 at 11:23
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TasunkaWitko - Chinook, Montana
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Rockydog
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Tas, Looks like a promising start. Good luck with the load you've chosen to hunt with. RD
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TasunkaWitko
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| Posted: 16 October 2007 at 09:55 | IP Logged
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with luck, i'll have time tomorrow to scan the six targets and post them in the report above. it might be good to have a visual, which may help with any analysis. from what i could see, there was no stringing (vertical or horizontal) but there might be something else.
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TasunkaWitko - Chinook, Montana
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TasunkaWitko
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| Posted: 08 November 2007 at 10:20 | IP Logged
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assuming an approximate velocity of 2600fps, i worked up some numbers using the point
blank ballistics program. here's what came out of the numbers:
Load Data
~~~~~~~~~
Name: .284 Cal, Hornady PSP - flat base, 139 grn
Ballistic Coeff: 0.392
Bullet Weight: 139
Velocity: 2600
Target Distance: 250
Scope Height: 1.500
Temperature: 45
Altitude: 3200
Ballistic Data
~~~~~~~~~~~~~~~
Range Elevation Velocity Energy ETA Drop Max Y 10mph Wind Deflect
0 yds -1.50 in 2600 fps 2086 fpe 0.000 sec 0.00 in -1.50 in 0.00 in
25 yds 0.34 in 2549 fps 2004 fpe 0.029 sec 0.16 in -0.56 in 0.04 in
50 yds 1.84 in 2498 fps 1925 fpe 0.059 sec 0.66 in -0.43 in 0.21 in
75 yds 3.01 in 2447 fps 1848 fpe 0.089 sec 1.49 in -0.22 in 0.41 in
100 yds 3.81 in 2397 fps 1774 fpe 0.120 sec 2.69 in 0.10 in 0.76 in
125 yds 4.23 in 2348 fps 1702 fpe 0.151 sec 4.27 in 0.51 in 1.25 in
150 yds 4.25 in 2300 fps 1632 fpe 0.184 sec 6.25 in 1.04 in 1.87 in
175 yds 3.85 in 2252 fps 1565 fpe 0.217 sec 8.65 in 1.68 in 2.62 in
200 yds 3.02 in 2204 fps 1499 fpe 0.251 sec 11.49 in 2.45 in 3.50 in
225 yds 1.74 in 2157 fps 1436 fpe 0.285 sec 14.76 in 3.35 in 4.50 in
250 yds 0.00 in 2111 fps 1375 fpe 0.320 sec 18.50 in 4.39 in 5.61 in
275 yds -2.21 in 2065 fps 1316 fpe 0.356 sec 22.71 in 5.57 in 6.84 in
300 yds -4.90 in 2020 fps 1259 fpe 0.393 sec 27.40 in 6.89 in 8.18 in
325 yds -8.17 in 1975 fps 1204 fpe 0.430 sec 32.68 in 8.40 in 9.73 in
350 yds -11.87 in 1931 fps 1150 fpe 0.468 sec 38.38 in 10.04 in 11.29 in
375 yds -16.21 in 1887 fps 1099 fpe 0.507 sec 44.72 in 11.89 in 13.08 in
400 yds -21.21 in 1844 fps 1050 fpe 0.547 sec 51.72 in 13.95 in 15.09 in
425 yds -26.90 in 1802 fps 1003 fpe 0.589 sec 59.41 in 16.24 in 17.29 in
450 yds -33.30 in 1761 fps 957 fpe 0.631 sec 67.80 in 18.76 in 19.69 in
475 yds -40.42 in 1721 fps 914 fpe 0.675 sec 76.92 in 21.52 in 22.27 in
500 yds -48.27 in 1681 fps 872 fpe 0.719 sec 86.78 in 24.53 in 25.02 in
525 yds -56.88 in 1642 fps 832 fpe 0.765 sec 97.39 in 27.81 in 27.94 in
550 yds -66.25 in 1604 fps 794 fpe 0.811 sec 108.76 in 31.35 in 31.01 in
575 yds -76.39 in 1566 fps 757 fpe 0.858 sec 120.90 in 35.17 in 34.23 in
600 yds -87.32 in 1529 fps 721 fpe 0.906 sec 133.83 in 39.28 in 37.58 in
625 yds -99.36 in 1493 fps 688 fpe 0.956 sec 147.87 in 43.77 in 41.25 in
650 yds -112.20 in 1458 fps 656 fpe 1.006 sec 162.71 in 48.57 in 45.03 in
675 yds -126.24 in 1424 fps 625 fpe 1.058 sec 178.75 in 53.79 in 49.10 in
700 yds -141.47 in 1391 fps 597 fpe 1.111 sec 195.98 in 59.43 in 53.45 in
725 yds -157.89 in 1359 fps 570 fpe 1.166 sec 214.40 in 65.50 in 58.02 in
750 yds -175.51 in 1329 fps 545 fpe 1.222 sec 234.01 in 72.01 in 62.81 in
775 yds -194.30 in 1299 fps 521 fpe 1.279 sec 254.81 in 78.95 in 67.79 in
800 yds -214.29 in 1271 fps 498 fpe 1.338 sec 276.79 in 86.35 in 72.95 in
Moving Target Lead Data
~~~~~~~~~~~~~~~~~~~~~~~
Range
5 Mph 10 Mph 15 Mph 20 Mph 25 Mph 30 Mph 35
Mph 40 Mph 45 Mph 50 Mph 55 Mph 60 Mph
0
yds 0.00 ft 0.00 ft 0.00 ft 0.00 ft 0.00 ft 0.00
ft 0.00 ft 0.00 ft 0.00 ft 0.00 ft 0.00 ft 0.00 ft
25
yds 0.21 ft 0.43 ft 0.64 ft 0.85 ft 1.07 ft 1.28
ft 1.49 ft 1.70 ft 1.92 ft 2.13 ft 2.34 ft 2.56 ft
50
yds 0.43 ft 0.86 ft 1.30 ft 1.73 ft 2.16 ft 2.59
ft 3.02 ft 3.46 ft 3.89 ft 4.32 ft 4.75 ft 5.18 ft
75
yds 0.65 ft 1.30 ft 1.96 ft 2.61 ft 3.26 ft 3.91
ft 4.56 ft 5.22 ft 5.87 ft 6.52 ft 7.17 ft 7.82 ft
100
yds 0.88 ft 1.76 ft 2.63 ft 3.51 ft 4.39 ft 5.27
ft 6.15 ft 7.02 ft 7.90 ft 8.78 ft 9.66 ft 10.53 ft
125
yds 1.11 ft 2.22 ft 3.33 ft 4.44 ft 5.55 ft 6.66
ft 7.77 ft 8.88 ft 9.99 ft 11.10 ft 12.21 ft 13.32 ft
150
yds 1.35 ft 2.69 ft 4.04 ft 5.39 ft 6.74 ft 8.08
ft 9.43 ft 10.78 ft 12.12 ft 13.47 ft 14.82 ft 16.17 ft
175
yds 1.59 ft 3.18 ft 4.77 ft 6.36 ft 7.95 ft 9.54 ft
11.13 ft 12.72 ft 14.31 ft 15.90 ft 17.49 ft 19.08 ft
200
yds 1.84 ft 3.68 ft 5.51 ft 7.35 ft 9.19 ft 11.03 ft
12.87 ft 14.70 ft 16.54 ft 18.38 ft 20.22 ft 22.06 ft
225
yds 2.09 ft 4.18 ft 6.27 ft 8.37 ft 10.46 ft 12.55 ft
14.64 ft 16.73 ft 18.82 ft 20.91 ft 23.00 ft 25.10 ft
250
yds 2.35 ft 4.70 ft 7.05 ft 9.40 ft 11.75 ft 14.10 ft
16.45 ft 18.79 ft 21.14 ft 23.49 ft 25.84 ft 28.19 ft
275
yds 2.61 ft 5.22 ft 7.84 ft 10.45 ft 13.06 ft 15.67 ft
18.28 ft 20.90 ft 23.51 ft 26.12 ft 28.73 ft 31.35 ft
300
yds 2.88 ft 5.76 ft 8.64 ft 11.52 ft 14.40 ft 17.28 ft
20.16 ft 23.04 ft 25.92 ft 28.79 ft 31.67 ft 34.55 ft
325
yds 3.16 ft 6.31 ft 9.47 ft 12.62 ft 15.78 ft 18.93 ft
22.09 ft 25.24 ft 28.40 ft 31.56 ft 34.71 ft 37.87 ft
350
yds 3.43 ft 6.86 ft 10.30 ft 13.73 ft 17.16 ft 20.59 ft
24.02 ft 27.46 ft 30.89 ft 34.32 ft 37.75 ft 41.18 ft
375
yds 3.72 ft 7.44 ft 11.15 ft 14.87 ft 18.59 ft 22.31 ft
26.03 ft 29.74 ft 33.46 ft 37.18 ft 40.90 ft 44.62 ft
400
yds 4.01 ft 8.03 ft 12.04 ft 16.05 ft 20.07 ft 24.08 ft
28.09 ft 32.11 ft 36.12 ft 40.13 ft 44.14 ft 48.16 ft
425
yds 4.32 ft 8.63 ft 12.95 ft 17.27 ft 21.58 ft 25.90 ft
30.22 ft 34.53 ft 38.85 ft 43.17 ft 47.48 ft 51.80 ft
450
yds 4.63 ft 9.26 ft 13.88 ft 18.51 ft 23.14 ft 27.77 ft
32.40 ft 37.03 ft 41.65 ft 46.28 ft 50.91 ft 55.54 ft
475
yds 4.95 ft 9.89 ft 14.84 ft 19.79 ft 24.74 ft 29.68 ft
34.63 ft 39.58 ft 44.52 ft 49.47 ft 54.42 ft 59.37 ft
500
yds 5.27 ft 10.55 ft 15.82 ft 21.09 ft 26.37 ft 31.64 ft
36.91 ft 42.19 ft 47.46 ft 52.73 ft 58.01 ft 63.28 ft
525
yds 5.61 ft 11.21 ft 16.82 ft 22.43 ft 28.03 ft 33.64 ft
39.24 ft 44.85 ft 50.46 ft 56.06 ft 61.67 ft 67.28 ft
550
yds 5.95 ft 11.89 ft 17.84 ft 23.78 ft 29.73 ft 35.68 ft
41.62 ft 47.57 ft 53.51 ft 59.46 ft 65.40 ft 71.35 ft
575
yds 6.29 ft 12.58 ft 18.87 ft 25.17 ft 31.46 ft 37.75 ft
44.04 ft 50.33 ft 56.62 ft 62.91 ft 69.21 ft 75.50 ft
600
yds 6.64 ft 13.29 ft 19.93 ft 26.57 ft 33.21 ft 39.86 ft
46.50 ft 53.14 ft 59.79 ft 66.43 ft 73.07 ft 79.72 ft
625
yds 7.01 ft 14.01 ft 21.02 ft 28.03 ft 35.04 ft 42.04 ft
49.05 ft 56.06 ft 63.06 ft 70.07 ft 77.08 ft 84.09 ft
650
yds 7.38 ft 14.75 ft 22.13 ft 29.50 ft 36.88 ft 44.26 ft
51.63 ft 59.01 ft 66.39 ft 73.76 ft 81.14 ft 88.51 ft
675
yds 7.76 ft 15.52 ft 23.27 ft 31.03 ft 38.79 ft 46.55 ft
54.30 ft 62.06 ft 69.82 ft 77.58 ft 85.33 ft 93.09 ft
700
yds 8.15 ft 16.30 ft 24.45 ft 32.60 ft 40.75 ft 48.90 ft
57.05 ft 65.20 ft 73.35 ft 81.50 ft 89.65 ft 97.80 ft
725
yds 8.55 ft 17.10 ft 25.66 ft 34.21 ft 42.76 ft 51.31 ft
59.87 ft 68.42 ft 76.97 ft 85.52 ft 94.07 ft 102.63 ft
750
yds 8.96 ft 17.93 ft 26.89 ft 35.85 ft 44.82 ft 53.78 ft
62.74 ft 71.71 ft 80.67 ft 89.63 ft 98.60 ft 107.56 ft
775
yds 9.38 ft 18.76 ft 28.15 ft 37.53 ft 46.91 ft 56.29 ft
65.68 ft 75.06 ft 84.44 ft 93.82 ft 103.21 ft 112.59 ft
800
yds 9.81 ft 19.62 ft 29.43 ft 39.24 ft 49.04 ft 58.85 ft
68.66 ft 78.47 ft 88.28 ft 98.09 ft 107.90 ft 117.71 ft
this is certainly adequate for the deer and antelope hunting that i expect to encounter in the near future.
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TasunkaWitko - Chinook, Montana
Helfen, Wehren, Heilen
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BEAR
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I sight mine in 2 inches high at 100 yds, so it is about 2.5 low at 200 yards. Anything over about 150 yds I laser the range, so flatness is not an issue. a taped trajectory to 400 yards is taped to the off side but stock and then I know the exact hold. Actually never killed anything over 210 with it, but that is only because I have other rifles and the opportunity never presented itself to me when I had the 7x57. I'm sure it will kill anything I can hit with it.
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pintopete
.22 LongRifle
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Hi guys, New to this forum. Glad I found it. I have been working with my 7x57 M77 tang safety and was posting on another forum. It is a long story so I will include a link to it.
http://shootersforum.com/showthread.htm?t=40155
I am looking forward to making up some new loads and trying again.
Thanks, Peter.
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BEAR
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Welcome Pinto.
I read your whole long downhill thread on the M77. You had lots of good information there. I've got a 7x57 and a 257 Robert Rugers, both from the mid '70s.
I hope your new barrel works. sort of anxious to hear if you still have the side to side "wiggle" of the stock. Mine do not do that.
Welcome. Looking forward to your range test.
BEAR
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tj3006
.416 Rigby
AKA King Leui VX-III
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Man I am teloing you try H-414 in the 7X57 and try RL-19.
I had a CZ and it was dynomite using 150 and down with the H-414 and with the 160s I used RL-19. And it was super acurate.
My #1A loves the 414 and I use other rounds If I want to shoot bigger bullets...tj3006
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The BSB SportzMan - A Forum for OutdoorzMen! : BSBlogs and Member Articles
Topic: load development - 7x57 mauser
