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> Long throating the 308 family
Long throating the 308 family
@ 05:26 am (GMT) |
BrianI have lengthened the throat on a 308, 7-08 AI and a 260 Rem. This allows the longer bullets to be seated out to about 2.950". The 260 I have been able to seat 143gr Norma Bondstrikes to 2.995".The 7-08AI has a 21" barrel and I did not see any velocity increase but the pressure signs were down and the brass lasted more than 2 or 3 firings. A Barnes 145gr LRX at about 3020 fps which is a significant increase over a 7-08. The 260 Rem will push a Barnes 127gr LRX at over 3100fps. Bumping right up against 264 Win Mag performance. All of the above are built around Savage actions with varying barrel manufacturers. I am in the process of building a custom rifle and was going to try and get the best of both worlds. A 260 AI with a lengthened throat and a 23" barrel but not the maximum for a 3" action. The idea being to get the increased powder space but not so long a throat that it rules out shorter bullets. Has anyone done this with a 260 Rem? And what were the results? Thanks |
Replies
@ 12:01 am (GMT) |
David LandwehrRe: Long throating the 308 familyHi Brian, if you're already bumping up against the 264 win mag with poor brass life I'm not sure while you're chasing more.I'm getting up near 3100fps with my 260 rem with 130gr eldm but it's a 28" barrel and my brass life is much better than yours. If you want 264 win mag ballistics, why not chamber for it. |
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@ 09:56 am (GMT) |
Brian SichterRe: Long throating the 308 familyHi DavidI have a 264WM and think it is kind of useless for what I do now - heavy and with a 24" barrel and a long action. I build lightweight mountain rifles so shorter barrels and usually short action. I built the long throated 260AI with a 23" Krieger barrel and settled on a 143gr Norma Bondstrike at 2980fps. There are no pressure signs and as a double check I measured the primer pocket and no expansion there. At 7800 ft elevation where I live and hunt the 143gr bullet gets to 700 yards with 1560 lb.f of energy. Bare the rifle weighs 5lb 13oz. It was the 7-08 Imp that was destroying brass after 2 or 3 firings which I fixed by throating the chamber and reducing pressures. The 7-08 Imp is a great cartridge. Probably my favorite build is a 284 Win in a 3.2" Defiance anTi action with a 21" barrel and weighs bare at 5lb 4oz. It is shooting a 168gr Barnes LRX at 2940fps. 6lb 2oz with 2.5-8x36 Leupold scope. |
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