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9.3X62AL
Guest
Roger that, Ian. Too many variables to control for.
I'll throw the other factor in; obduration is not directly related to BHn. The formula works pretty well for alloys of lead, tin and antimony with the tin being about 1/3 of the antimony percentage and Lyman #2. Anytime you change the structure of the crystals in the bullet, it skews the results, I. e. heat-treating.
I agree with Ian, that looking at the math shown in Lyman CBH #3, that it is not physically possible to make a bullet smaller than bore size by shooting it down the pistol barrel. However, it is easy to get gas cutting to blow pass the bullet.
So,get enough lube at launch,get engraved as quickly as possible....then what?
Do we have to have a lube star?And here is another issue with this sort of question...brrl length.
4Q or "Four Quarters" has become my 'simple lube' of choice. It has a track record of being my best 'cold start' lube over many loads in many guns. A positive statement is always best when many different elements are in the testing. It can't take Ian's 'blast furnace' environment; but will tolerate the mountains. I never let my loaded ammo get over 100*F even hunting Prairie Dogs in July!. I haven't tested it cold. I've shot it at minus -5*F fine, but not cold.... This winter gave many mornings at temps in the minus 30's below zero! But my wife was in the hospital very ill and she was my concern. I will speculate it will pass double digits on the minus side fine.... Ester likes bitter cold as much as this ol' man!Care to share more about that lube?
Another advantage of 4Q 3.2 Brad is it doesn't smell! I can smell a little hot beeswax, maybe the paraffin a little... Smells good hot to me. But I cook in the garage as I'm set up to.... 450* temps or lithium I do outside....My wife will make me weigh away then cook way away.