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The Basics, Starting Out
I would like an explanation about action-cartridage fit.
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<blockquote data-quote="Fiftydriver" data-source="post: 102763" data-attributes="member: 10"><p>Clay,</p><p></p><p>The 257 is really in a shady middle ground as far as being called a short action round. In reality is is not a true SHORT action design. The reason is because of its case length.</p><p></p><p>If you look at the true short action rounds, the first thing you think of is the 308 Winchester based cartridges, 243 win, 260 Rem, 7-08 Rem, 308 Win, 338 Fed, 358 Win and such. These cases are roughly 2.045" in length, perfect match for a true short action receiver.</p><p></p><p>Next step up in case length you get into the 284 based wildcats and parent case. These have a case length of 2.170" in length or slightly more then 1/10" longer then the 308 based cases. This length is getting tight in receivers such as the Rem 700 except in the smaller calibers with the lighter bullets. The heavier bullets can be used in the 284 based rounds but in a repeating role in a Rem 700 SA, you have to specifically design the throat very short to allow reaching the lands with handloads and still being able to feed through the magazine. </p><p></p><p>The 284 based rounds are about as long as you can practically fit into a Rem 700 SA as a repeater and these are a tight fit at times.</p><p></p><p>Now if you compare those to the 257 and also the 6mm Rem and 7x57 you will see they have a case length of roughly 2.233". Again, noticablly longer then even the 284 case. Basically these split the difference in case lenght from the 308 based cases to the '06 length cases.</p><p></p><p>The 6mm Rem can have its bullets seated very short and still work well in a short action receiver. The 257 and 7mmx57 can as well but the bullets need to be seated very deep to work. It is really a cramp to do this in a true short action receiver. </p><p></p><p>It is for this reason that you generally hear them being chambered in standard action length so that you can seat the bullets out where they really should be and not taking up so much case capacity like they have to in a Short Action.</p><p></p><p>Hope this clears the mud for you some!!??? /ubbthreads/images/graemlins/grin.gif</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 102763, member: 10"] Clay, The 257 is really in a shady middle ground as far as being called a short action round. In reality is is not a true SHORT action design. The reason is because of its case length. If you look at the true short action rounds, the first thing you think of is the 308 Winchester based cartridges, 243 win, 260 Rem, 7-08 Rem, 308 Win, 338 Fed, 358 Win and such. These cases are roughly 2.045" in length, perfect match for a true short action receiver. Next step up in case length you get into the 284 based wildcats and parent case. These have a case length of 2.170" in length or slightly more then 1/10" longer then the 308 based cases. This length is getting tight in receivers such as the Rem 700 except in the smaller calibers with the lighter bullets. The heavier bullets can be used in the 284 based rounds but in a repeating role in a Rem 700 SA, you have to specifically design the throat very short to allow reaching the lands with handloads and still being able to feed through the magazine. The 284 based rounds are about as long as you can practically fit into a Rem 700 SA as a repeater and these are a tight fit at times. Now if you compare those to the 257 and also the 6mm Rem and 7x57 you will see they have a case length of roughly 2.233". Again, noticablly longer then even the 284 case. Basically these split the difference in case lenght from the 308 based cases to the '06 length cases. The 6mm Rem can have its bullets seated very short and still work well in a short action receiver. The 257 and 7mmx57 can as well but the bullets need to be seated very deep to work. It is really a cramp to do this in a true short action receiver. It is for this reason that you generally hear them being chambered in standard action length so that you can seat the bullets out where they really should be and not taking up so much case capacity like they have to in a Short Action. Hope this clears the mud for you some!!??? [img]/ubbthreads/images/graemlins/grin.gif[/img] Kirby Allen(50) [/QUOTE]
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The Basics, Starting Out
I would like an explanation about action-cartridage fit.
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