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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
# of Shots per Group and MOA - Results
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<blockquote data-quote="J E Custom" data-source="post: 1941275" data-attributes="member: 2736"><p>There are many reasons for the group size to increase the more shots you take.</p><p></p><p>The main thing I have found it barrel condition changes over the full series of shots. if you start with a clean barrel and do your best to control the temperature and your fatigue. you will find that at some point the accuracy/group size will open up due to fouling. Most custom quality barrels are effected starting at 4 to 7 or 8 shots. even though not a practical hunting scenario I like to first find out how many shots a rifle can do before accuracy starts to degrade by cleaning and shooting evenly spaced (Time) shots. Then I will clean again and shoot that number again. two or three groups under these conditions will tell me just how accurate the rifle is.</p><p></p><p>For hunting this makes more sense than just shooting 20 shots in a row when one or two shots are the norm. For match shooting where 20 shot strings are the norm, it is good to find out where the barrel fouling settles down and is consistent. some rifle barrels take 8 to 10 rounds and others may take many more.</p><p></p><p>For load work up I like and recommend cleaning before every load change to make the test apples to apples. If you need to fire a fouling shot before starting the test, do so. (Many barrel will throw the first shot and settle in for the next 4 or 5. I have some hunting rifles that this is the preferred process and others that shoot the first round in the same spot as the next 4 or more.</p><p></p><p>If you want to shoot 20 shots to get maxim group size that's fine, but there are a lot of variables that can skew the end results, so I would recommend shooting 4 five shot groups on different targets and cleaning between each group, then measure each group and average all 4 of them, this will tell you the true potential of the load consistency</p><p>in my opinion.</p><p></p><p>Hunting requires a different kind of testing in my opinion than targets and loads must be developed for each type of use for best results. Test for the way it will be used.</p><p></p><p>Just my opinion<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1941275, member: 2736"] There are many reasons for the group size to increase the more shots you take. The main thing I have found it barrel condition changes over the full series of shots. if you start with a clean barrel and do your best to control the temperature and your fatigue. you will find that at some point the accuracy/group size will open up due to fouling. Most custom quality barrels are effected starting at 4 to 7 or 8 shots. even though not a practical hunting scenario I like to first find out how many shots a rifle can do before accuracy starts to degrade by cleaning and shooting evenly spaced (Time) shots. Then I will clean again and shoot that number again. two or three groups under these conditions will tell me just how accurate the rifle is. For hunting this makes more sense than just shooting 20 shots in a row when one or two shots are the norm. For match shooting where 20 shot strings are the norm, it is good to find out where the barrel fouling settles down and is consistent. some rifle barrels take 8 to 10 rounds and others may take many more. For load work up I like and recommend cleaning before every load change to make the test apples to apples. If you need to fire a fouling shot before starting the test, do so. (Many barrel will throw the first shot and settle in for the next 4 or 5. I have some hunting rifles that this is the preferred process and others that shoot the first round in the same spot as the next 4 or more. If you want to shoot 20 shots to get maxim group size that's fine, but there are a lot of variables that can skew the end results, so I would recommend shooting 4 five shot groups on different targets and cleaning between each group, then measure each group and average all 4 of them, this will tell you the true potential of the load consistency in my opinion. Hunting requires a different kind of testing in my opinion than targets and loads must be developed for each type of use for best results. Test for the way it will be used. Just my opinion:) J E CUSTOM [/QUOTE]
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