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The Basics, Starting Out
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<blockquote data-quote="fmuguira" data-source="post: 2458899" data-attributes="member: 27974"><p>I ve shot 40 grs of imr4831 with an 80 gr Berger in my 22-250 AI. Very accurate and fast. </p><p></p><p>From what looking I ve done it appears imr4955 is slower burning so backing down for the extra bullet weight with a 88 gr bullet would make sense. I d say 10 percent off or so. Maybe start at 36 grs and work up carefully. If you have a chronograph that ll be very helpful. </p><p></p><p>A bunch of us are shooting 40 grs of R26 with the 88 Eldm in our 22-250 AI. Getting 3150 fps. </p><p></p><p>Proceed at your own caution but you ll really like that heavy bullet in that cartridge. One other thing to watch, we ve got 8 twist barrels and when it's hot out and if you load that bullet up to 3200 fps plus you may have bullet failure. We ve found if you approach/exceed 300,000 rpm in long barrels that bullet can disintegrate. You ll reach those rpm's much faster with your 7 twist</p></blockquote><p></p>
[QUOTE="fmuguira, post: 2458899, member: 27974"] I ve shot 40 grs of imr4831 with an 80 gr Berger in my 22-250 AI. Very accurate and fast. From what looking I ve done it appears imr4955 is slower burning so backing down for the extra bullet weight with a 88 gr bullet would make sense. I d say 10 percent off or so. Maybe start at 36 grs and work up carefully. If you have a chronograph that ll be very helpful. A bunch of us are shooting 40 grs of R26 with the 88 Eldm in our 22-250 AI. Getting 3150 fps. Proceed at your own caution but you ll really like that heavy bullet in that cartridge. One other thing to watch, we ve got 8 twist barrels and when it’s hot out and if you load that bullet up to 3200 fps plus you may have bullet failure. We ve found if you approach/exceed 300,000 rpm in long barrels that bullet can disintegrate. You ll reach those rpm’s much faster with your 7 twist [/QUOTE]
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