115 grain .311 cast boolit soup cans. Question

[Alpha1]

I am shooting 115 grain .311 cast soup cans in my 7.62x39 with 4grains of Bullseye they are traveling at approx. 1100 fps is leading likely to be a problem. Should I be gas checking them.

They work very well at 25 yards I was well surprised.

[meles meles]

We suspect Dromia won't be surprised...

[mag41uk]

No gas check required at that velocity.
Get over ,say,1500 fps and you probably will.

Tony

[Alpha1]

No gas check required at that velocity.
Get over ,say,1500 fps and you probably will.

Tony

Oh that is good to hear that makes this a incredibly cheap round to shoot and accurate to.

[dromia]

Was there any leading after you had shot them?

If not you have answered your own question.

Leading is usually due to poor boolit fit, too hard an alloy for the velocity, too brittle an alloy for the velocity, poor barrel condition, inappropriate lube for the application, copper fouling in the barrel. Get them all right and you might be surprised at how fast a non gas checked boolit can be fired without leading. I am currently getting plain based boolits to shoot well at 1900 fps in my Springfield, I suspect they will go faster just haven't tried it yet.

However some rifles shoot gas checked boolits more accurately than gas checked boolits without gas checks, it is down to the rifle. So it is always best, especially when shooting at a low velocity, to check how the rifle shoots any specific gas check boolit design with a gas check and without a gas check. You may be surprised at the difference in group size. I have no theory to explain this other than rifles are female.