I recently had my barrel threaded and a muzzle device put on for a 308 savage 10 20" medium contour, 5r 1:10 barrel. And before this I had good accuracy with 168gr match ammo, Hornaday and FGMM. I am still very new to precision shooting and having worked through some issues I was having and testing different match ammo, my accuracy was crap. So after research I read that 1:10 twist could prefer the heavier 175gr and its been a while since I shot it, I have made a bunch of changes to my rifle (stock, scope, etc.). So I purchased one box of FGMM 175 Sierra Matchking and I was disappointed in my performance. I have been working really hard on my form, consistency, trigger manipulation. . . after 4 consecutive groups of 4 rounds I was Mad!!! you can see my results below on the middle diamond (1st set of 4, then made adjustment to zero and shot 2nd set of 4) and upper left and right groups. And I swore that I had better accuracy with the tread protector I have on it, my muzzle device is a Griffin armament taper mount paladin brake , so i took the thread protector off, and shot my last 4 rounds, mad and quicker than I did the other 4 sets and man oh man. . . I couldn't stop laughing. You can see the results on the bottom left diamond.
So for those who use thread protectors or other stuff attached to their muzzle end, make sure you test without it in the beginning and not like me. . . after many boxes of ammo
So for those who use thread protectors or other stuff attached to their muzzle end, make sure you test without it in the beginning and not like me. . . after many boxes of ammo