I did a search, but nothing definite found. Rumor online suggests that Lee and maybe RCBS dies shape the shoulder differently and are actually made for the specs of 1911/GP90 rounds. Redding I think is made for GP11, but their dies are several times more expensive. 1) Is it still true that Lee (and RCBS?) dies are different? 2) Does it matter? If I go for the GP90, what will I be sacrificing? Accuracy? 3) Any personal experience? Your recommended dies?