Thanks for the Post Kurt.Kurt wrote: So far I've found that too hard of an alloy will produce flyers in the current freebore PP chambered rifle. I did some testing last month with various, stabile lead/tin/antimony mixes as hard as Lyman # 2 at 15.4 BHN. The groups got better as the alloy got softer. An alloy with a BHN of 9.8 shot the best. As I've said there is a lot of misinformation about how hard lead-tin alloys are. An alloy that has a BHN of 9.8 is much harder than even 10-1. But, here's the really odd finding from back in 2004. The Pedersoli referenced above liked 50-1 the best. I tried numerous lead-tin and lead-tin-antimony alloys, but 50-1 out-shot all of them.
Kurt
this little part caught my eye.( I figured it was by you) but my testing with my Browning 45-90 with the freebore showed just the opposite. I finally quit having flyers when I got down to 12.5 : 1 alloy. It may have to do with the different nose shape you were testing with back then or the dia the bullet you were patching. Mine was a money bullet starting at .454 patched to about .4595 to .460. ( Assuming of course we are still talking about patched to Groove, not bore.)
Brian