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Rifles, Reloading, Optics, Equipment
Reloading
260 AI speed question
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<blockquote data-quote="stomp442" data-source="post: 858764" data-attributes="member: 70571"><p>I know this is an older thread but this is my input. What cases are you using? If necking down brass you really need to turn the necks for best performance. I have a savage chambered in this cartridge with a 26" criterion barrel. The sweet spot for my barrel is 2940 fps and I can achieve that quite easily in fact I had velocities over 3000 fps during load development but it was hard on primer pockets so I backed it off. I am using brass that I made from 30-06 lake city match cases that are trimmed to fit my chamber exactly. By using 30-06 cases I am able to have a slightly longer neck than people that simply fire form 260 or 243 cases. The match cases are also thicker and provide higher velocity than standard brass while using less powder. My load for 140 bergers in my AI is only 44 grains of H4831 that's giving me 2940 fps and less than 2" groups at 600 yards. I realize some barrels are faster than others and I'm sure I have a faster one but using match cases ups my velocity by 60 fps vs standard Remington brass. To achieve the same velocity using Remington cases I have to use a grain and a half more powder. My point to all this being that maybe using match cases could get you to the velocity you desire. its a lot of work to make custom cases but I feel its worth it in the long run as it greatly decreases throat erosion and extends barrel life. Shoot me a pm if you would like step by step instructions on making cases. </p><p></p><p>One other thought. Have you ran your rifle through multiple chronys to verify speed?</p></blockquote><p></p>
[QUOTE="stomp442, post: 858764, member: 70571"] I know this is an older thread but this is my input. What cases are you using? If necking down brass you really need to turn the necks for best performance. I have a savage chambered in this cartridge with a 26" criterion barrel. The sweet spot for my barrel is 2940 fps and I can achieve that quite easily in fact I had velocities over 3000 fps during load development but it was hard on primer pockets so I backed it off. I am using brass that I made from 30-06 lake city match cases that are trimmed to fit my chamber exactly. By using 30-06 cases I am able to have a slightly longer neck than people that simply fire form 260 or 243 cases. The match cases are also thicker and provide higher velocity than standard brass while using less powder. My load for 140 bergers in my AI is only 44 grains of H4831 that's giving me 2940 fps and less than 2" groups at 600 yards. I realize some barrels are faster than others and I'm sure I have a faster one but using match cases ups my velocity by 60 fps vs standard Remington brass. To achieve the same velocity using Remington cases I have to use a grain and a half more powder. My point to all this being that maybe using match cases could get you to the velocity you desire. its a lot of work to make custom cases but I feel its worth it in the long run as it greatly decreases throat erosion and extends barrel life. Shoot me a pm if you would like step by step instructions on making cases. One other thought. Have you ran your rifle through multiple chronys to verify speed? [/QUOTE]
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Reloading
260 AI speed question
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