I just posted this in another thread nd saw this one. I use the IMR 4895 in my 243 with 55 Sierra Blitzkings. I tried both the blitzkings and Nosler BT's and found the Sierra's shot slightly better for me, but the Noslers still shot very well. I also used the IMR 4064 but found the IMR 4895 to shoot more consistent. I am not getting the best groups but I consistently get what I call 2 mating flies and a bystander, the bystander is within 1/2" of the 2 on each other and the bystander is always the third consecutive shot. I once took one shot, waited an hour, took another shot, waited another hour and took the third shot and had 1 hole in the target. With the IMR 4064 I was getting in between 1/2 and 3/4" groups in a triangle fashion. I am loading 44.5 grains of it with Federal Large rifle match primers with a 1:10 twist barrel. One thing I have found is it almost takes a barrel specifically made for these light bullets to shoot them well but it is doable with alot of playing in faster twists.