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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
308 win and the berger 215
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<blockquote data-quote="Canadian Bushman" data-source="post: 866523" data-attributes="member: 41122"><p>Ok so ive figured a few things out and thought i would report my findings in case shane and i are not the only two interested in this topic.</p><p></p><p>I got my hands on 4 lbs of re17 and 250 berger 215 hybrids, and started taking measurements on my rifle.</p><p></p><p>SAAMI spec for throat length for .308 win is 2.302 ( correct me if im wrong )</p><p>My rem 700 has a throat length of 2.325. ( erosion? )</p><p>This allowed a 3.145 C.O.A.L with the berger 215 to touch the lands.</p><p>That yielded a length of engagement of .215 between bullet and case.</p><p>My rifle can not normally eject a cartridge any longer than aprx 3.050.</p><p></p><p>I ordered a 30" lilja in a #7 contour w/ a 1:10 3 groove twist that should show up between jan-feb. </p><p></p><p>Now i will do some quick load development and find a charge that yields a velocity of aprx 2550 fps and see what COAL is required to compress that charge and add .02-.03 to finalize a throat dimension for the new barrel. </p><p></p><p>I also need to decide whether i want to cut the barrel to 26" and shoot it suppressed or leave it as long as possible and utilize every inch of barrel i paid for. </p><p></p><p>My suppressor gave me an additional 60 fps in my current load but im still uncertain about accuracy with it. </p><p>Im uncertain about what velocities i could achieve with a 29.5" barrel but fairly certain accuracy would be more consistent and wont miss the additional length and weight of the can. </p><p></p><p>Needless to say the next few months ill be burning up my current stock of ammo and finalizing dimensions of the new barrels chamber and length. Hopefully it shows up a little early.</p></blockquote><p></p>
[QUOTE="Canadian Bushman, post: 866523, member: 41122"] Ok so ive figured a few things out and thought i would report my findings in case shane and i are not the only two interested in this topic. I got my hands on 4 lbs of re17 and 250 berger 215 hybrids, and started taking measurements on my rifle. SAAMI spec for throat length for .308 win is 2.302 ( correct me if im wrong ) My rem 700 has a throat length of 2.325. ( erosion? ) This allowed a 3.145 C.O.A.L with the berger 215 to touch the lands. That yielded a length of engagement of .215 between bullet and case. My rifle can not normally eject a cartridge any longer than aprx 3.050. I ordered a 30" lilja in a #7 contour w/ a 1:10 3 groove twist that should show up between jan-feb. Now i will do some quick load development and find a charge that yields a velocity of aprx 2550 fps and see what COAL is required to compress that charge and add .02-.03 to finalize a throat dimension for the new barrel. I also need to decide whether i want to cut the barrel to 26" and shoot it suppressed or leave it as long as possible and utilize every inch of barrel i paid for. My suppressor gave me an additional 60 fps in my current load but im still uncertain about accuracy with it. Im uncertain about what velocities i could achieve with a 29.5" barrel but fairly certain accuracy would be more consistent and wont miss the additional length and weight of the can. Needless to say the next few months ill be burning up my current stock of ammo and finalizing dimensions of the new barrels chamber and length. Hopefully it shows up a little early. [/QUOTE]
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308 win and the berger 215
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