I learned about this bullet here and have been testing them extensively in my 14 twist 24" Cooper barrel. Load is 38.7 gr H380 with an average velocity of 3556. Two sighter shots at 200 yds to test the wind yesterday went into one hole that measured .033. I shot PD's from around 200 to 394 lasered yards. The bullets performed very well at all ranges comparing favorably with the Nosler BT's I was also shooting. The 394 yd dog was still in one piece, but pretty thoroughly destroyed. I expect to shoot this bullet exclusively for a while.