As we're shooting a card, or testing ammo, and the barrel starts to warm up as more and more rounds are fired, first the bullet sits momentarily at the hottest spot in the bore, then as it travels down the bore, the bore gets cooler and cooler.
So the bullet is facing different temp extremes as it travels down the bore toward the muzzle.
So the bullet is also facing different viscosties of wax that has been deposited in the bore by previous bullets.
I wonder, if a feller could someway keep the bore cooler, from end to end, could it help waxed, lead bullet, rimfire accuracy?
Your friend, Bill Calfee