Last weekend, I heard two guy debating the better long range in-line. One guy who I know shoots a good bit of BPCR, swears that a 45 with a long bullet is much more capable of long range accuracy than a fifty. He says a fifty , with more area exposed to the front is more subject to air drag than a 45. When I saw his bullets, he was using the Ideal 457-125, which is the same 500 grain bullet that I use for 500 meter sillywets with my trapdoor. Kind of weird. But he claims accuracy is as good as a BPCR. What the guy said seems to make sense.