Got a problem...maybe
I have a caster that does my bullets and he uses a 1/3 WW, 1/3 Lino, 1/3 lead alloy mix then adjusts to a BHN of 16.
You made me a two cavity XL alum mold for a 700 gr, 0.625" as cast, 50% meplat, 0.500" nose length, 0.100" front banc that is producing bullets running about 665 gr plus/minus a couple and also producing 0.629-0.630" OD bullets....the description tag went out with the trash and he has the mold so I can't measure it for about two weeks while he makes me another 250 and I see him at the gun show...I THINK I ordered a 0.625" as cast but may have messed up.
The rifle is an NEF 20 ga USH and I slugged the bore at 0.619" and the grooves are ~0.632" using one of the cast bullets, and so far the accuracy isn't doing very well...4-5" patterns at 15 yds, using several powder amounts in new Cheddite 2.96" 20 ga plastic cases both heat crimped and roll crimped.
The best group I got today was a 7/8" CC using bullets I chucked up in my lathe and turned down to a ~70% mep, ~0.800" long, 0.300" nose length and ~600 gr final weight...roll crimped once fired Cheddite cases, AA 2495 powder, chronoed at 1642 fs. I want to use those dimensions and ~735 gr which should cast at 700 gr as far as the present runs are doing...casting about 35gr light with his mix.
I want to order another SINGLE CAVITY mold for a truncated cone nose, 3 grease groove, no crimp groove, 0.300" nose length, 0.110" front band bullet but in BRASS this time, SO
My question is....just HOW/WHICH numbers to use in the design program and WHAT alloy to pick to arrive at an AS CAST 700 gr slug at ~0.623- 0.625 OD using his alloy mix??