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Cartridge choice....
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<blockquote data-quote="codyadams" data-source="post: 2056833" data-attributes="member: 87243"><p>If your brass is in good enough condition to be worth saving, that alone would make up my mind, you would just have your smith headspace your new chamber to your current .243 AI brass so no concerns there and no real need to fireform, any forming will be very minor, and your already set up for reloading it. </p><p></p><p>I personally have a .260 AI, it's bigger brother, and I love it. It is a 29" barrel, and it is neck and neck performance wise with a couple 24" 6.5x284's I load for, maybe just a little more speed, the 5" of barrel makes up for the 5-6ish less grains of powder used. With equal length barrels, I would expect the 6.5x284 to outrun the .260ai by around 75-100ish fps, and I would expect that would carry over to the 6mm versions as well. The 6ai would be right there woth the 6x284, maybe even beat it by a small margin?? I'm not sure on that one. I would suspect the 6cm would be about 50ish fps behind the .243ai also, as equal length 6.5cm's are about 50-75 fps behind my .260ai. This is using top tier brass like adg, Peterson, Lapua, etc, which would possibly be a hindrance for the 6ai. That's about the best I can do for answering that question.</p><p></p><p>As far as inherent accuracy, I think some cartridges may have wider nodes or be easier to tune, but I believe the difference is minutiae unless your competing in bench rest. I like the 40° shoulders of the ai's personally, simply for the fact of essentially eliminating trimming. As far as your options, I think all of them are very efficient and easy to load cartridges. My father had a standard 6mm, he shot 55 grain ballistic tips well north of 4000, and it was extremely accurate and not picky at all. As long as the rifle is put together by a good smith, any of those will do fantastic, but seeing as your already set up for .243ai, that would be my choice.</p></blockquote><p></p>
[QUOTE="codyadams, post: 2056833, member: 87243"] If your brass is in good enough condition to be worth saving, that alone would make up my mind, you would just have your smith headspace your new chamber to your current .243 AI brass so no concerns there and no real need to fireform, any forming will be very minor, and your already set up for reloading it. I personally have a .260 AI, it's bigger brother, and I love it. It is a 29" barrel, and it is neck and neck performance wise with a couple 24" 6.5x284's I load for, maybe just a little more speed, the 5" of barrel makes up for the 5-6ish less grains of powder used. With equal length barrels, I would expect the 6.5x284 to outrun the .260ai by around 75-100ish fps, and I would expect that would carry over to the 6mm versions as well. The 6ai would be right there woth the 6x284, maybe even beat it by a small margin?? I'm not sure on that one. I would suspect the 6cm would be about 50ish fps behind the .243ai also, as equal length 6.5cm's are about 50-75 fps behind my .260ai. This is using top tier brass like adg, Peterson, Lapua, etc, which would possibly be a hindrance for the 6ai. That's about the best I can do for answering that question. As far as inherent accuracy, I think some cartridges may have wider nodes or be easier to tune, but I believe the difference is minutiae unless your competing in bench rest. I like the 40° shoulders of the ai's personally, simply for the fact of essentially eliminating trimming. As far as your options, I think all of them are very efficient and easy to load cartridges. My father had a standard 6mm, he shot 55 grain ballistic tips well north of 4000, and it was extremely accurate and not picky at all. As long as the rifle is put together by a good smith, any of those will do fantastic, but seeing as your already set up for .243ai, that would be my choice. [/QUOTE]
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