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Rapidly expanding groups?
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<blockquote data-quote="J E Custom" data-source="post: 1335410" data-attributes="member: 2736"><p>Your experiences must be different than Mine because I have built many rifles and worked on many factory rifles and have been reloading for over 50 years and can almost predict how many rounds it will take before it becomes fouled based on the bore scope inspection of the barrel and the amount of machine/tooling marks.</p><p></p><p>Many Premium barrels break in within 7 to 10 rounds and clean up with one or two solvent patches and a light brushing. I have seen factory barrels that needed 50 or 60 and some never really cleaned up and had machine marks for the rest of there life.</p><p></p><p>If you start with a totally clean barrel and shoot groups, It will tell you when fouling has effected the accuracy. After fouling some barrel will shoot well for many rounds, just not as good as when the barrel is not fouled. Most will find that when shooting a 5 shot group, the lase shot is never as good as the first 2 or 3 and the group opens up a little.</p><p></p><p>Depending on the condition of the bore the number of good shots can range from 3 to over 10. Some like to shoot 10 shot groups to see when accuracy is effected and to get realistic groups and SDs.</p><p></p><p>On really accurate rifles (Those that shoot less than 1/10th MOA) this really shows up as a distinctive change in accuracy and can double the group size.</p><p></p><p>Just My experience.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1335410, member: 2736"] Your experiences must be different than Mine because I have built many rifles and worked on many factory rifles and have been reloading for over 50 years and can almost predict how many rounds it will take before it becomes fouled based on the bore scope inspection of the barrel and the amount of machine/tooling marks. Many Premium barrels break in within 7 to 10 rounds and clean up with one or two solvent patches and a light brushing. I have seen factory barrels that needed 50 or 60 and some never really cleaned up and had machine marks for the rest of there life. If you start with a totally clean barrel and shoot groups, It will tell you when fouling has effected the accuracy. After fouling some barrel will shoot well for many rounds, just not as good as when the barrel is not fouled. Most will find that when shooting a 5 shot group, the lase shot is never as good as the first 2 or 3 and the group opens up a little. Depending on the condition of the bore the number of good shots can range from 3 to over 10. Some like to shoot 10 shot groups to see when accuracy is effected and to get realistic groups and SDs. On really accurate rifles (Those that shoot less than 1/10th MOA) this really shows up as a distinctive change in accuracy and can double the group size. Just My experience. J E CUSTOM [/QUOTE]
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