CJR
04-05-2010, 03:56 PM
I know that some have reduced bullet diameter in stages (i.e. using different die sizes) to get to a final bullet diameter. What's considered a reasonable amount of reduction in bullet diameter that can be done in one die? Any difference if bullet is soft or hard?
Right now I air-cool my 311291s, PP, size to 0.309", load and all is well in a .308 Win. However, my WQ .375s were close to BHN 20 (LBT) and stripped- off the PP during sizing. Next time I cast, I'll simply air-cool and see what happens during the sizing operation. If that doesn't work, then I'll see if I can size a WQ CB to 0.001"/0.0015" above BORE, PP, and size to 0.001"/0.002" above GROOVE diameter. Comments anyone?
From what I know so far; regular lubed CB are typically sized to GROOVE diameter or slightly more. However the CB, used for PP, can either be first sized to BORE diameter and then PP OR PP and sized to GROOVE diameter (i.e. either way results in the CB being close to BORE diameter). Being able to just size a PPCB to GROOVE diameter is a lot faster and eliminates the need to buy more sizing dies. What approach gives better high velocity accuracy?
Best regards,
CJR
Right now I air-cool my 311291s, PP, size to 0.309", load and all is well in a .308 Win. However, my WQ .375s were close to BHN 20 (LBT) and stripped- off the PP during sizing. Next time I cast, I'll simply air-cool and see what happens during the sizing operation. If that doesn't work, then I'll see if I can size a WQ CB to 0.001"/0.0015" above BORE, PP, and size to 0.001"/0.002" above GROOVE diameter. Comments anyone?
From what I know so far; regular lubed CB are typically sized to GROOVE diameter or slightly more. However the CB, used for PP, can either be first sized to BORE diameter and then PP OR PP and sized to GROOVE diameter (i.e. either way results in the CB being close to BORE diameter). Being able to just size a PPCB to GROOVE diameter is a lot faster and eliminates the need to buy more sizing dies. What approach gives better high velocity accuracy?
Best regards,
CJR