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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 Norma vs 300 Norma Imp
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<blockquote data-quote="Alex Wheeler" data-source="post: 2281643" data-attributes="member: 101859"><p>If your testing this at long range, past 600yds you will see what I mean. Its sometimes hard to pick up at 600 even. But typically a rifle will shoot its smallest group right before it shoots its largest group when going up in powder charge. So if I tune a rifle before the barrel is fully broken in and its shoots small, then I clean the barrel and go out the next day and it speeds up 20-30 fps I will have huge vertical at long range. Same goes for new brass, in many cases fired brass wants more powder than new brass. If that happens, your not shooting just a little bigger, your shooting huge vertical. Neck tension is another aspect that shows up huge at those distances. Many times fired brass wants a different neck tension than the virgin case, even if it shot well on virgin brass. Not to mention that on new brass there is no carbon in the neck. So too many things change and I have wasted a lot of effort because I had to do the job twice. Shooting 1/2 moa consistently past about 800yds requires a pretty good tune not something you can get away with much error. If we are talking 600 and in then a lot of this stuff does not show up bad enough to make the rifle unusable.</p></blockquote><p></p>
[QUOTE="Alex Wheeler, post: 2281643, member: 101859"] If your testing this at long range, past 600yds you will see what I mean. Its sometimes hard to pick up at 600 even. But typically a rifle will shoot its smallest group right before it shoots its largest group when going up in powder charge. So if I tune a rifle before the barrel is fully broken in and its shoots small, then I clean the barrel and go out the next day and it speeds up 20-30 fps I will have huge vertical at long range. Same goes for new brass, in many cases fired brass wants more powder than new brass. If that happens, your not shooting just a little bigger, your shooting huge vertical. Neck tension is another aspect that shows up huge at those distances. Many times fired brass wants a different neck tension than the virgin case, even if it shot well on virgin brass. Not to mention that on new brass there is no carbon in the neck. So too many things change and I have wasted a lot of effort because I had to do the job twice. Shooting 1/2 moa consistently past about 800yds requires a pretty good tune not something you can get away with much error. If we are talking 600 and in then a lot of this stuff does not show up bad enough to make the rifle unusable. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 Norma vs 300 Norma Imp
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