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 -
https://www.okshooters.com/threads/messin-with-the-mosin.258322/
and
https://www.okshooters.com/threads/more-messin-with-the-mosin.259319/
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.
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.
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
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....
For those that care, or want to get caught up -
https://www.okshooters.com/threads/messin-with-the-mosin.258322/
and
https://www.okshooters.com/threads/more-messin-with-the-mosin.259319/
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.
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.
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
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....