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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Short necks=short throat life??
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<blockquote data-quote="goodgrouper" data-source="post: 58049" data-attributes="member: 2852"><p>Brian Winzor,</p><p></p><p> I am glad you asked that question. As a matter of fact, last spring I had the barrel borescoped just out of curiosity to see what 750 rounds would do to a 3 groove barrel. It looked nearly new! There was slight "lake bed" appearance for about 1/16" in front of the leade and that was it. I thought it would last forever at that rate. But somehow in the next few hundred rounds it grew to 1.5" inches of lake bed. And no, it never got really hot, except once but nothing like I couldn't touch the barrel.</p><p> I too have another .22-.250 AI, but it is an 8" twist and shoots 75 grain v-max at 3350. It started life as a .22-.284 on a 30" tube, and after it shot out I cut 3" off and did the Ackley. So that barrel has had roughly 1700 rounds down it and it is still going strong and I've only lost about .025" of the throat since rechambering. Incidentally, The barrel shot out on the .22-.284 at 950 rounds! It burned 10 grains more powder but held on to the throat to within 100 rounds of the other .22-.250 AI. But it (the .22-.284) had a longer neck! I really think that might help. </p><p> As for the other comment about how your seating depth remained the same, mine did too! I never adjusted it at all for the entire 1050 rounds. It always felt and touched the riflings so much that once a loaded round was in the gun, I had to shoot it because the rifling would pull the bullet out otherwise. Then one day it went all to hell. My groups tripled in size and I couldn't find the riflings with the bullet anymore! What frustration.</p></blockquote><p></p>
[QUOTE="goodgrouper, post: 58049, member: 2852"] Brian Winzor, I am glad you asked that question. As a matter of fact, last spring I had the barrel borescoped just out of curiosity to see what 750 rounds would do to a 3 groove barrel. It looked nearly new! There was slight "lake bed" appearance for about 1/16" in front of the leade and that was it. I thought it would last forever at that rate. But somehow in the next few hundred rounds it grew to 1.5" inches of lake bed. And no, it never got really hot, except once but nothing like I couldn't touch the barrel. I too have another .22-.250 AI, but it is an 8" twist and shoots 75 grain v-max at 3350. It started life as a .22-.284 on a 30" tube, and after it shot out I cut 3" off and did the Ackley. So that barrel has had roughly 1700 rounds down it and it is still going strong and I've only lost about .025" of the throat since rechambering. Incidentally, The barrel shot out on the .22-.284 at 950 rounds! It burned 10 grains more powder but held on to the throat to within 100 rounds of the other .22-.250 AI. But it (the .22-.284) had a longer neck! I really think that might help. As for the other comment about how your seating depth remained the same, mine did too! I never adjusted it at all for the entire 1050 rounds. It always felt and touched the riflings so much that once a loaded round was in the gun, I had to shoot it because the rifling would pull the bullet out otherwise. Then one day it went all to hell. My groups tripled in size and I couldn't find the riflings with the bullet anymore! What frustration. [/QUOTE]
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Short necks=short throat life??
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