I've had some advise to oversize the bullet by .001 above the throat. what would be the advantage over just matching the throat size if i know all my chambers have the same throat size(used pin gauges) and is larger than the groove diameter?
what would be the advantage over just matching the throat size if i know all my chambers have the same throat size(used pin gauges) and is larger than the groove diameter?
If you if you have a gun like that 629 - 3 that just will not shoot standard .430" diameter cast bullets (or whatever is normal for your situation) well, have a look at the throat dimensions. Gas blow-by in the throat is a major source of leading.
I was using a .430" diameter Star sizer die and wound up having to put an 11 mm reamer through it. Afterwards, all was well.
The bottom line is that you must measure your gun and use ammunition that is sized appropriately for it. This could involve some trial and error, LOL.
I'm dying to try .429" swaged hollow point bullets (that I make) in my 329PD because those throats all measure .4290". Just what the base guard concept needs to work, I think. Now if I could just get some spare time...