Lead melter
05-08-2008, 08:00 AM
So I slugged the barrel of my M-49 Moisin-Nagant this morning and after repeated measurements I keep coming up with the same things
The diameter, at the smallest point of the lands is .304" The smallest diameter of the grooves is right at .3145".
Strange thing is, shooting the Lee C312-185-1R as cast [.312" across the mold, .313" at the part line] with just the gas check bump crimped to about .316", or with the boolit sized to .313" still gives me really good accuracy in my 50 yard plinker load with 10-12 grains Unique. I also get very good accuracy with the stock .311" condom bullet in factory ammo.
Have I done something wrong while measuring the barrel slug? Is the boolit bumping up enough to fill the grooves when fired? Reckon the boolit swages into the grooves enough to give rotational stability?
Can't figure this one out. Anyone have a barrel like this? Any ideas are welcome.
The diameter, at the smallest point of the lands is .304" The smallest diameter of the grooves is right at .3145".
Strange thing is, shooting the Lee C312-185-1R as cast [.312" across the mold, .313" at the part line] with just the gas check bump crimped to about .316", or with the boolit sized to .313" still gives me really good accuracy in my 50 yard plinker load with 10-12 grains Unique. I also get very good accuracy with the stock .311" condom bullet in factory ammo.
Have I done something wrong while measuring the barrel slug? Is the boolit bumping up enough to fill the grooves when fired? Reckon the boolit swages into the grooves enough to give rotational stability?
Can't figure this one out. Anyone have a barrel like this? Any ideas are welcome.