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Long Range Hunting & Shooting
Cold Bore Zeroing
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<blockquote data-quote="Bravo 4" data-source="post: 1272397" data-attributes="member: 8873"><p>Cold bore mapping a rifle is a good idea. Especially for a hunting or precision rifle where first round hits are desired and may be the only one fired. If the first round out of a cold (fouled) bore does not hit same poi as consecutive rounds, folks call it a first round flier. I do not, since that is the one that matters I say the rest are fliers. If I get sighter shots to bring everything in for the next several then call it the opposite. I've had issued rifles that had this going on, nothing I can do about that except learn to deal with it. To check it I would do as stated, keep track of where the first round hits. If it's consistent then it's easy to deal with. If not there may be other underlying issues.</p><p>A good idea has been mentioned, keep a target and fire your first rounds on it for a series of range sessions. Or keep your groups fired on targets in a binder/shooting logbook and mark each shot as 1-2-3 (4-5 or whatever). I do this for a fouled and clean cold bore (this helps me determine how many fouling shots each barrel needs to calm down and shoot right). Sometimes you have to clean and just don't have the luxury of shooting fouler shots.</p></blockquote><p></p>
[QUOTE="Bravo 4, post: 1272397, member: 8873"] Cold bore mapping a rifle is a good idea. Especially for a hunting or precision rifle where first round hits are desired and may be the only one fired. If the first round out of a cold (fouled) bore does not hit same poi as consecutive rounds, folks call it a first round flier. I do not, since that is the one that matters I say the rest are fliers. If I get sighter shots to bring everything in for the next several then call it the opposite. I've had issued rifles that had this going on, nothing I can do about that except learn to deal with it. To check it I would do as stated, keep track of where the first round hits. If it's consistent then it's easy to deal with. If not there may be other underlying issues. A good idea has been mentioned, keep a target and fire your first rounds on it for a series of range sessions. Or keep your groups fired on targets in a binder/shooting logbook and mark each shot as 1-2-3 (4-5 or whatever). I do this for a fouled and clean cold bore (this helps me determine how many fouling shots each barrel needs to calm down and shoot right). Sometimes you have to clean and just don't have the luxury of shooting fouler shots. [/QUOTE]
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