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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need some creative thinking outside the box
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<blockquote data-quote="Steve Shelp" data-source="post: 179954" data-attributes="member: 22"><p>All,</p><p> I've got some info from the 6.5 world that I think will help you figure out what can and can't be done. When Sierra came out with the 6.5 155 SMK bullet, I tried them in my 6.5-300 WWH with a 30" Hart barrel. The throat in this rifle was setup for the 139gr Norma bullets but it had burnt out enough that seating the 155s wasn't too bad. The body/boatail junction was seated approx .075" below the neck/shoulder junction of the case. It would have been nice to have a longer throat, but I was giving the 155s a quick evaluation to see how they shot and go from there. If they worked pretty good I would've throated it properly and let'um fly. But the accuracy of them never really worked for me so I stayed with the 140gr class bullets. Also the small BC change wasn't worth the effort/expense.</p><p></p><p> Anyway....through all of my testing with the 155s (a couple hundred rounds across the chrono and on paper) I never got them much over 3175fps at 10ft from the muzzle. Again that is with a full load of H870 and a 30" (8" and 9" twist) barrel in a 6.5-300 WWH. The 9" twist barrel was a shotgun with the long 155 grainers at 100yds.</p><p></p><p> So based on that and using the velocities pointed out by BuffaloBob to stay supersonic..... this is going to be cutting it rather thin and a lot of pressure for a 6.5 in a short barrel. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p><p></p><p>Good luck and hope these reference numbers help.</p><p></p><p>Steve</p></blockquote><p></p>
[QUOTE="Steve Shelp, post: 179954, member: 22"] All, I've got some info from the 6.5 world that I think will help you figure out what can and can't be done. When Sierra came out with the 6.5 155 SMK bullet, I tried them in my 6.5-300 WWH with a 30" Hart barrel. The throat in this rifle was setup for the 139gr Norma bullets but it had burnt out enough that seating the 155s wasn't too bad. The body/boatail junction was seated approx .075" below the neck/shoulder junction of the case. It would have been nice to have a longer throat, but I was giving the 155s a quick evaluation to see how they shot and go from there. If they worked pretty good I would've throated it properly and let'um fly. But the accuracy of them never really worked for me so I stayed with the 140gr class bullets. Also the small BC change wasn't worth the effort/expense. Anyway....through all of my testing with the 155s (a couple hundred rounds across the chrono and on paper) I never got them much over 3175fps at 10ft from the muzzle. Again that is with a full load of H870 and a 30" (8" and 9" twist) barrel in a 6.5-300 WWH. The 9" twist barrel was a shotgun with the long 155 grainers at 100yds. So based on that and using the velocities pointed out by BuffaloBob to stay supersonic..... this is going to be cutting it rather thin and a lot of pressure for a 6.5 in a short barrel. ;) Good luck and hope these reference numbers help. Steve [/QUOTE]
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Need some creative thinking outside the box
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