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Re: The .45-70... It just keeps getting better and better.
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Old 04-18-2005, 02:21 PM
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Default Re: The .45-70... It just keeps getting better and better.

Since I only shot the other two bullets at 50 and 100 yds, I'll combine their targets in this post. The first picture is of a -shot group at 50yds using the Silver Bullet; the second is a 7-shot group at 100. The third is a 3-shot group with the "Factory" cartridge at 50 yds, and the fourth is the "Factory" cartridge at 100.

The 500g Postells were propelled by 50.0 grains of N-135, and the 405 Silver bullets by 52.0 grains of N-135. I don't know what the "factory cartridges were using.

The average muzzle velocities and their standard deviations are:

500 Postell - 1799 f/s, 29 f/s, N=11
405 Silver Bullet - 1801 f/s, 17 f/s, N = 10
405 "Factory" - 1849 f/s, 7 f/s, N = 6

Notice that the 500 was essentially going just as fast at the muzzle as the 405 Silver Bullet was! (Felt like it too!) With a ballistic coefficient of .447, that's a potent 300 yard cartridge.

I've decided not to bore you with the quantitative analysis. Suffice it to say that I am very pleased with the accuracy (precision) of the 500 Postell using 50.0 grains of N-135. Laser Cast's Silver Bullet did better with 50.0 grains of N-135 than with 52. And the "Factroy" round was better than any of my handloads. (I hate it when that happens. ) BUT... I think I know what's up with getting my loads better. They get better every time I go to the range, so I think I'm onto the 'problem'... not enough attention to detail while reloading. I am developing new reloading techniques with these .45-70 cases and cast bullets, and consistency seems to be critical... as of course it always is with precision reloading. It's just that "new techniques" and "consistency" are mutually exclusive.

Untill the next range event,
Paul
Attached Images
File Type: jpg 45-70 50yd 405g Silver Bullet 52g N-135.JPG (60.2 KB, 72 views)
File Type: jpg 45-70 100yd 405g Silver Bullet 52g N-135.JPG (70.9 KB, 77 views)
File Type: jpg 45-70 50yd 405g Factory.JPG (58.3 KB, 77 views)
File Type: jpg 45-70 100yd 405g Factory.JPG (66.6 KB, 79 views)
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Tags
.45-70, buffalo classic, h&r 1871, martini, postell, range report, silver bullet, swinburn


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