What ate you launching those with?
.300 RUM. Have some 199's with a .299 G7 at 3200 and change, but with a 10 twist, stability is marginal. An all copper 181 at that speed is a killer. My buddy owns the company, and the 181 in the RUM is proven. He has a customer shooting the 152 grain at 3700 fps. mtmuley