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Hey there Flatland Hunter and Omega...
I see you two and Randy have found a great new place to hang out.
Acceptable 100 yard accuracy is a personal thing. And it largely depends on just how far a fella expects to shoot at a deer or other big game.
I rely on loads that have proven themselves capable of printing right at an inch (or better) at a hundred. Now, I'm not always up to that degree of accuracy...but I like to know that I'm hunting with a rifle...bullet...and powder charge that is. (Because if it isn't, I'll look even worse!)
When working up loads, I'm very choosy about my rest - and am a firm believer of using good shooting bags and to shoot from a rock solid rest. However, I realize that I'm not going to have those things with me when I'm in the field. So, once I have a load refined to where I can keep three-shot clusters inside of an inch at 100 yards with some degree of regularity...I'll then do a lot of shooting by resting on just the shooting bench...off a fence post...across a log...or something that will pretty well duplicate the type of rest I'm likely to be faced with when hunting. And if I can still keep my shots at 1 1/2 or so inches at 100 yards...I'm extremely happy.