40-65 mould

[Steveu]

The saga continues. I was able to test 4 different bullets at 400 yards: Baco JIM410410M1, Saeco 740, Baco JIM409411C1 and a Pioneer Postel that weighs 454 gr. Long story short, the Saeco 740 shot the best along with the Pioneer a close second, Money then creedmoor. I think that the Pioneer did well in the 16 twist because it was a very calm day with a slight 3:00 wind, a quartering headwind might have not turned out as good. Anyhow, I am still on the hunt to solve the slight leading problem I have by switching to a 96-2-2 alloy. It has helped and I am planning to use some Swiss BP lube to see if that works and if it does not I will try some 95-2.5-2.5. I fired up the casting pot yesterday to pour some Saeco 640's and 740"s. On a whim I decided to check the fit of the 640 in the muzzle and it seemed a little tighter fit. So I dropped it in the muzzle of my 40-90sbn C. Sharps and it was even tighter. I measured the 640 and it was .3995, the 740 was .397. My question is, how tight does the bearing surface of the nose have to be?

I looked at getting some pin gauges to measure the bore diameter more accurately than trying to measure it with a cerrosafe cast with the tools I have on hand. I can get 5 minus pins for under $20 plus shipping.

Cheers,
Steve