Oldhippie: what you saw in my previous post was a sure sign of age creeping up on an already spent mind. My friend owns a Winchester Model 70 Featherweight XTR in 7x57mm and it has a 1x10 twist. The bottom line is, I screwed up that line in my post.
Your Full Stock CZ 550 in 7x57mm has a 1x8.66 twist, just like my CZ 550 American with the longer barrel. You might, if you handload, give some 160 grain Nosler Partitions a try with 48.3 grains of H414. My brother's CZ 550 Full Stock in 7x57mm puts three partitions into a .75 inch circle with that load. He has chronographed the load at 2,645 fps, which is pretty darned flat shooting for a 160 grain slug. Another 7x57mm fanatic likes Reloader 19 with the heavier bullets. A friend of my brother also owns a CZ 550 Full Stock in 7x57mm and his rifle loves 162 grain Hornady SSTs with 48.3 grains of powder. His is loaded out to 3.270 inches overall lenghth. The fellow tells me he can shoot the heads off of Texas turkies at 100 yards with that rig and load. Also said it is deadly on deer and hogs.
I appologize for the wrong twist rate on the other post. I hope this clears the matter up. The attachment show the kind of groups I can get with my CZ 550 American with the 162 grain Hornady SSTs and H414 powder. In my rifle and my brother's friend's rifle, that combination goes together like peanut butter and jelly. Tom Purdom
