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Rifles, Reloading, Optics, Equipment
Reloading
22/243
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<blockquote data-quote="Varmint Hunter" data-source="post: 191215" data-attributes="member: 313"><p>I have owned and shot a 22-243AI for many years. A super accurrate and max load for me was with the 75gr A-Max (moly) @ 3,668 ft/sec. RE22 was THE powder for this cartridge. I worked up a fireforming load that used 55gr bullets at 22-250 velocities. It was not very hard to get .5moa groups with fireforming loads. I use to call them "huntforming" loads because I shot groundhogs as I formed cases. However, reduced barrel life is the obvious consequence of fireforming cases for a hot cartridge. (assuming that you are using bullets rather than COW)</p><p></p><p>As much as I loved the 22-243AI, when it was time to set the barrel back and rechamber, I had it rechambered in 22-243 (plain). No case forming and similar ballistics. Not equal, but similar. Some shooters of the 22-243 claim to get the same velocity as the AI version but I can't believe that it can be done without an increase in pressure.</p><p></p><p>My 26" Hart barrel has an 8 twist which would not shoot the 80gr SMK very well, which is why I shot the 75gr A-Max. I have yet to try the newer 80-90gr A-Max and similar heavy-weights.</p></blockquote><p></p>
[QUOTE="Varmint Hunter, post: 191215, member: 313"] I have owned and shot a 22-243AI for many years. A super accurrate and max load for me was with the 75gr A-Max (moly) @ 3,668 ft/sec. RE22 was THE powder for this cartridge. I worked up a fireforming load that used 55gr bullets at 22-250 velocities. It was not very hard to get .5moa groups with fireforming loads. I use to call them "huntforming" loads because I shot groundhogs as I formed cases. However, reduced barrel life is the obvious consequence of fireforming cases for a hot cartridge. (assuming that you are using bullets rather than COW) As much as I loved the 22-243AI, when it was time to set the barrel back and rechamber, I had it rechambered in 22-243 (plain). No case forming and similar ballistics. Not equal, but similar. Some shooters of the 22-243 claim to get the same velocity as the AI version but I can't believe that it can be done without an increase in pressure. My 26" Hart barrel has an 8 twist which would not shoot the 80gr SMK very well, which is why I shot the 75gr A-Max. I have yet to try the newer 80-90gr A-Max and similar heavy-weights. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
22/243
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