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Anyway, with Lyman #2 alloy, my boolits come out .314"! As I had mentioned above, my rifles' groove diameters are both .310". I powder coat instead of lube, making my boolits about .315" +/- 0.001"
Question: I have noticed when sizing my boolits with my Lee .311 sizer (it actually sizes to .310"), it takes the powder coat completely off the driving bands. SIZING LUBE WILL HELP
Will that contribute to leading of the barrel? And, would that affect accuracy? YES and YES
I do have a .314" sizer, but that is .004" larger than my groove diameter, so I figured it is too big.... MIGHT TRY A 50/50 ALLOY TO GET SMALLER BULLETS
Antimony and mould temp determine bullet cast diameter so less and hotter might get you something that doesn't need sizing. Then you could use a normal lube so the bullet dia doesn't change much. With PC, try sizing before PC .311, and NOT after.