I"m not sure what the come on is? LC worked well enough that we never looked further. It used to be something on the lines of 15 or 19 per 1000... and in lots of instances totally free.
LC would shoot 3 inch or less at 600, my best test group load was 5 shots at 600 at appx 1.25 inches ( used ruler, didn't really care). That was a hummer barrel though. Wished it had been my barrel. LOL
My rule was 10 shot groups at 300 of 2 inches or less, and 5 shot test groups of 4 inches or less at 600, followed by 22 shot strings in matches to prove or disprove a load. LC got us there.
