Sub half moa on demand isn't easy for a five shot group. I had a rifle (6.5 creed, fairly lightweight rifle, around 9 pounds fully dressed) that I would have taken that bet with. Sold it to a buddy and I can still get behind that thing and shoot some groups in the .3's and .4's
The 300 PRC I have in the classifieds right now I would call an honest half minute gun, but 300 PRC is a whole lot harder to drive then a Creed so when I broke a .5 group with it I usually felt it was on me. This is a 5 shot group out of it, the high flier was on me
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These are 10 shot groups out of a 300 wm I sold and a 300 wsm I still have.I know the 300 wm looks like 5 but I can promise it was 10. Both very consistent guns but I wouldn't take that bet with either.
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This a a 6.5 prc my wife had, this was a typical 5 shot out of it but sometime it would shoot more in the .6's or 7's so I also wouldn't take that bet with it.
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The truth is it's all just for fun, and true half minute rifles are a whole lot harder to come by then most people think. if you can put 10 in 1 moa with good ES and call wind good you can kill anything you point a rifle at.