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The Range
Military Surplus
Still messin' with the Mosin
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<blockquote data-quote="Dumpstick" data-source="post: 3148373" data-attributes="member: 41653"><p>I've had a couple threads on here about this 1930 Izzy Hex, and my trials and tribulations with it.</p><p> For those that care, or want to get caught up -</p><p><a href="https://www.okshooters.com/threads/messin-with-the-mosin.258322/" target="_blank">https://www.okshooters.com/threads/messin-with-the-mosin.258322/</a></p><p>and</p><p><a href="https://www.okshooters.com/threads/more-messin-with-the-mosin.259319/" target="_blank">https://www.okshooters.com/threads/more-messin-with-the-mosin.259319/</a></p><p></p><p> I was doing okay at the OKCGC Military matches; not setting the place on fire, but at least not last place (Thanks again, Darrin !).</p><p> I slugged the bore at .315", and started shooting cast sized to .316". The rifle will not chamber anything with a neck dimension fatter than .338", and I was having trouble chambering certain brands of brass - Winchester specifically. I decided to try outside turning the necks to .010" (.010 + .010 + .316 = .336" leaves me .002" for neck expansion). As soon as I did that, I started getting fliers.</p><p> Crazy fliers. Like this - Look up at the very top of the target. The shot barely clipped the paper, from 75 yds.</p><p>[ATTACH=full]123128[/ATTACH]</p><p> I don't know what is going on. According to the chrono numbers, this should shoot lights out -</p><p> Vel 1781 fps</p><p> Spread 21 fps</p><p> StdDev 8.8 fps.</p><p> See that ? Single digit deviations, very consistent numbers.</p><p> Maybe it's lube purge fliers ? Maybe the check is flying of, now that there is room in the neck for it to do so ?</p><p></p><p> On a whim, I decided to try another load. Straight from Lyman cast #3, 21.5gr 4198.</p><p>[ATTACH=full]123129[/ATTACH]</p><p></p><p> 5 shots, at least no fliers. Numbers look very goos -</p><p>Vel 1670 fps</p><p>Spread 11 fps</p><p>StdDev 5.5 fps</p><p></p><p> Are you kidding me ? 5.5 fps deviation ? The group isn't that good, but then I'm not a very good shot either.</p><p></p><p> tried another load, 22.5gr 4198</p><p>[ATTACH=full]123130[/ATTACH]</p><p></p><p> The numbers are still good, not as great as the 21.5gr load, but still -</p><p>Vel 1729 fps</p><p>Spread 24 fps</p><p>StdDev 9.15 fps</p><p></p><p> I may be on to something here....</p></blockquote><p></p>
[QUOTE="Dumpstick, post: 3148373, member: 41653"] I've had a couple threads on here about this 1930 Izzy Hex, and my trials and tribulations with it. For those that care, or want to get caught up - [URL]https://www.okshooters.com/threads/messin-with-the-mosin.258322/[/URL] and [URL]https://www.okshooters.com/threads/more-messin-with-the-mosin.259319/[/URL] I was doing okay at the OKCGC Military matches; not setting the place on fire, but at least not last place (Thanks again, Darrin !). I slugged the bore at .315", and started shooting cast sized to .316". The rifle will not chamber anything with a neck dimension fatter than .338", and I was having trouble chambering certain brands of brass - Winchester specifically. I decided to try outside turning the necks to .010" (.010 + .010 + .316 = .336" leaves me .002" for neck expansion). As soon as I did that, I started getting fliers. Crazy fliers. Like this - Look up at the very top of the target. The shot barely clipped the paper, from 75 yds. [ATTACH=full]123128[/ATTACH] I don't know what is going on. According to the chrono numbers, this should shoot lights out - Vel 1781 fps Spread 21 fps StdDev 8.8 fps. See that ? Single digit deviations, very consistent numbers. Maybe it's lube purge fliers ? Maybe the check is flying of, now that there is room in the neck for it to do so ? On a whim, I decided to try another load. Straight from Lyman cast #3, 21.5gr 4198. [ATTACH=full]123129[/ATTACH] 5 shots, at least no fliers. Numbers look very goos - Vel 1670 fps Spread 11 fps StdDev 5.5 fps Are you kidding me ? 5.5 fps deviation ? The group isn't that good, but then I'm not a very good shot either. tried another load, 22.5gr 4198 [ATTACH=full]123130[/ATTACH] The numbers are still good, not as great as the 21.5gr load, but still - Vel 1729 fps Spread 24 fps StdDev 9.15 fps I may be on to something here.... [/QUOTE]
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