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Rifles, Reloading, Optics, Equipment
Reloading
Vertical stringing
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<blockquote data-quote="greenejc" data-source="post: 1963031" data-attributes="member: 60453"><p>If the barrel strings every fourth shot and is consistent in where it strings the shot, it isn't seating, throat erosion or bedding. The consistent placement of the fourth shot rules that out. If it was bedding, throat erosion or inconsistent seating, you wouldn't get a distinct pattern with three in a tight cluster and a consistent outlier, which is to the same place, then its probably the barrel heating in a consistent pattern. You might try cryogenic stress relieving, which will cause the barrel to heat evenly instead of changing point of impact as it heats. I have an -06 Ruger m77MKII that will shoot 5 shots into 1" or 3/4 " at 100 yards, but it puts two rounds touching and one about 3/4" right, the fourth back into the first two, making a ragged hole, and the fifth cutting the third about 3/4" right and at the same elevation. All are vertically on line and spread horizontally, but grouped within an inch overall. Basically, I have a group of 3 shots and two shots, each group touching or nearly so, spread horizontally by about 3/4" and vertically about 3/8". The barrel flexes just enough to spread the group horizontally with the same pattern. No vertical spread, but consistent horizontal spread of the same size and pattern from group to group. That is barrel heat changing point of impact slightly. It will consistently shoot the same group pattern with accurate loads and with loads the rifle doesn't like. Group sizes will be larger, but the pattern is the same; a horizontal spread with a smaller vertical spread, and three rounds grouped to the right of two rounds. I'm not worried about the horizontal spread because the Ruger barrel is a pencil barrel and the overall groups are still within an inch, which is 'good enough' for what the rifle is designed and used for. But if you want to know what your rifle will really do, do some 5 and 10 shot strings. See where the barrel hits and how tight the groups are with 5 and 10 shots. This will really tell you if you have a barrel walking problem. Do it at 100, 200, 300 and 400 yards and see what the results are.</p></blockquote><p></p>
[QUOTE="greenejc, post: 1963031, member: 60453"] If the barrel strings every fourth shot and is consistent in where it strings the shot, it isn't seating, throat erosion or bedding. The consistent placement of the fourth shot rules that out. If it was bedding, throat erosion or inconsistent seating, you wouldn't get a distinct pattern with three in a tight cluster and a consistent outlier, which is to the same place, then its probably the barrel heating in a consistent pattern. You might try cryogenic stress relieving, which will cause the barrel to heat evenly instead of changing point of impact as it heats. I have an -06 Ruger m77MKII that will shoot 5 shots into 1" or 3/4 " at 100 yards, but it puts two rounds touching and one about 3/4" right, the fourth back into the first two, making a ragged hole, and the fifth cutting the third about 3/4" right and at the same elevation. All are vertically on line and spread horizontally, but grouped within an inch overall. Basically, I have a group of 3 shots and two shots, each group touching or nearly so, spread horizontally by about 3/4" and vertically about 3/8". The barrel flexes just enough to spread the group horizontally with the same pattern. No vertical spread, but consistent horizontal spread of the same size and pattern from group to group. That is barrel heat changing point of impact slightly. It will consistently shoot the same group pattern with accurate loads and with loads the rifle doesn't like. Group sizes will be larger, but the pattern is the same; a horizontal spread with a smaller vertical spread, and three rounds grouped to the right of two rounds. I'm not worried about the horizontal spread because the Ruger barrel is a pencil barrel and the overall groups are still within an inch, which is 'good enough' for what the rifle is designed and used for. But if you want to know what your rifle will really do, do some 5 and 10 shot strings. See where the barrel hits and how tight the groups are with 5 and 10 shots. This will really tell you if you have a barrel walking problem. Do it at 100, 200, 300 and 400 yards and see what the results are. [/QUOTE]
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