leading question
A friend of mine and I both baught some hard cast bullets from the same source. They are suppose to be 92% lead 6% tin and 2% antimoney. Mine were 250 grain .452 for my 45 colt and his were 240 grain .430 for his 44 mag. We both have new Rossie model 92,s in the short rifle configuration and both bores look like a mirrior. We are both shooting 8 grains of Unique which understandably should give him a slightly faster velocity but still pretty modest. He also dropped his load to 7.5 grains of Unique with the same results. His rifle leads fairly severly and mine shows absolutely no signs of any leading. Now, if he was pushing his a lot faster and beyond what is exceptable for a bullet of this mix it would be explainable, but his velocity is not much more than mine so why does his rifle lead and mine does not?
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He may have an oversize bore or undersize bullets which allow blowby.
His bore may have left the factory rougher than yours. putting a box of jacketed bullets through while cleaning and degreasing the bore between each shot would fix that.
His bullet design may have an overly narrow lube groove. It may wipe out before the bullet reaches the muzzle. If there is also a loose fit, this problem would be worse.
One brand of dies I had caused the bullets to size down if they were too big because the die was tight.
Edit: I'd say a commercial caster probably has their lube sorted out. He didn't buy the bullets with "SPG" on them, did he? They're for blackpowder....but that's the only way I could see two similar bullet types having different lube from the same source.
It could be all from one round-maybe he had a double charge!0 -
You did not say if both of you are using the same lube. That could be the difference. 0
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