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Grouping explaination

1298 Views 9 Replies 8 Participants Last post by  Jakeway
I would like to know what are the parameters for grouping? I'm new to accuracy shooting, and I don't want to sound like a fool when I talk about how my rifle groups. How many shots does one need to take at a group to say a rifle is accurate 3,5,10? I was assuming 3 since I thought that was what the factory claimed their 1" at 100yrds addvertising with, is this correct or does their need to be more rounds then 3? How much time is taken between each round, is it click click boom, or do you wait a minute or two for the gun to cool down? When refering to groups past 3 rounds, could one assume that the accuracy will always suffer due to fouling and an unclean barrel? To some these questions may sound dumb, but please bear with me. I guess if one is looking for a factory rifle and the claims are that it shoots 3 rounds under an inch at 100yrds, could this be false advertising for a rifle they claim to have out of the box accuracy with since we don't know where that 4th and 5th etc. round ends up at? Just give me your thoughts, not looking for any brand name rifle explaination or put downs, just looking for a general definition of "grouping", and if you can please be technical meaning trying to stay away from general opinions and such. Thanks guys.
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I like to shoot a bunch of 5 shot groups at targets I print on regular printer paper. After I shoot a bunch of groups, I can stack up the paper so the targets all line up, hold it to a strong light, and I can see simulated 10, 15, or even 20 shot groups. One day I was testing three different hand loads, with quite varying powder charges, and the stacked groups were within a 2" circle at 100 yards. That made me feel really good; not only were the groups small, but the rifle was very forgiving of variations in the ammo. (Of course, the bullets and powder type were the same. No way it would put a 120 gr bullet to the same spot as a 140 gr.)

One other thing: if someone claims a certain size 3 shot group, that should be only three shots at the target. It's not shooting 5 shots and measuring the best three. If the best three are shots 1,3, and 5, that's cheating.
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3 shots for hunting rifles. The few times I've connected beyond the first shot, I've generally regretted it as it just meant more animals to field dress.... :D
Yup. Tennessee's "3-does-a-day" limit can really ruin a weekend!
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