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I have a question about greese groove on cast bullets. I know that Lee moldes sometimes have many shallow grooves and that those were designed to be lubricated with Alox lube.
There seems to be two major types of grease grove on cast bullets; single large groove or multiple small grooves. My guess is that it has something to do with the bearing surface of the bullet.
A single groove does not apply grease to the nose of the projectile so we progress to those types that hold multiple grooves where the distribution over the length is more even.
There is a limit to the depth of a single groove as it could weaken the bullet and cause obturation and inaccuracy.
Note that the .38 Special lead WC comes with multiple grease grooves and that is certainly not a high pressure round.
If I had my "druthers" I'll always prefer the single grease groove bullets since I cast, lubricate and size my own.
Both work, mostly a cost/equipment issue as tumble lubing only requires a butter tub and lube but wax type lubes are most often used with a lubersizer or pan lubing...
The worst it means is first round of the day will lead a little more than average.
But the lube left in the bore by that first round will serve as the leading edge lube for the next round.
highwall 38 stated A single groove does not apply grease to the nose of the projectile so we progress to those types that hold multiple grooves where the distribution over the length is more even i have been shooting cast bullet rifle for years and rarley lube more than the bottom groove.
many cast bullet shooters claim that too much lube causes flyers. i do know that lube in the bottom groove works well for me, however my loads are mostly in the 1500 to 1600 fps.