Cool thanks ill start there and see how it goes.
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Cool thanks ill start there and see how it goes.
Sorry for late reply. With the 140VLD-H and with a Superformance powder load of 46.9gn I'm getting about 2830F/S.
Obviously this load is for my rifle and starting several grains less for your tests would be sensible.
Good Luck
What are peoples optimal oal length in this cal? Eg how does it go
In a rem short action with the 140's seated out?
And further to that, in a 20inch tube what is a realistic MV between the .260 and AI version using 143gr (yeah, yeah I know) projectiles.
Is the increase substantial?
I'd say no even though I haven't had a 260 Ai, in a 20" mine's pushing 2700 with the 140 without pressures. Anaemic I know but I'm a barrel life and accuracy guy so I'm never going to be the person who's chasing 3000 in a 6.5 with 140's.
My .260AI has a 22" barrel and I would say 2800 will be max with 140's, I have some 143grn on order to try but if you want higher speed then I would go for something else.
Yep.
I can get just under 2800fps with my 6.5x47L (140amax/Re17/24")
142gn LRAB 3007fps 24" 260AI
My barrel at 24" can produce some speed but It has a sweet spot running it slower so I don't see the point fussing around with it when it is just a bit extra wound on the turret if needed.
Don't think I have a fast barrel especially when there are standard .260s out there running the same speeds I get or faster.
I like the caliber but would have been just as happy with a standard 260 or even better a 6.5-06
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If you want 3000 at low pressures with a 140 out of a 6.5, you only got one option... have a look at a 6.5 SAUM.... (6.5 GAP 4S) with ADI2217 (H1000)....
Everything else runs smaller capacity and higher pressures, which appears to be more destructive than capacity alone... the penalty of course is around 60 grains of powder in that larger case...
Its funny but we may yet see a move back to larger capacity and slower powders to duplicate what we can achieve with smaller capacity and higher pressures for less fuss and bother and a longer lasting barrel... not to mention a larger safety margin...
My 6.5-06 did 3100 easily with 140 gr bullets.
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Attachment 45867
Don't think I've ever had an Accubond load shoot overly well. Good to see this trend continuing. Lol.
Same.
The 130gr Nosler AB shot superbly well in my .260. I thought they were a little hard and didn't leave too much of a wound track on deer but everything I shot with them died.
That will what I'll try this week. 130's AB.
Waiting for the new amax really.
Any updates with newer powders and relative performance?
I have some Superformance, R19 and 2206h.
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I am not a 260, 55 or creedmore owner but they do interest me. I keep wondering when I read about load development for these cals if any of you have tried a 6.5 x 57 AI ? Just that wee bit more capacity without getting up to a 284 case. Although it does need a med length action. Would probably send you 140's out at 3000fps
still using 2209 in my t3x 260 just got some norma brass to test out. have been using fc 7mm08. 43.5 ar2209 was 12mm 43.7 was 16mm havn't run it over a crony yet. Attachment 96543
Yep had one on a Turkish Mauser build, thumbhole stock and 28 inch barrel got it shortened to 24" then had to fire form cases a lot of fluffing around for no real world gain. @Tahr's 6.5x55 with 20" barrel was quicker. I was getting around 3000fps with 130 grain projectiles. A 6.5x284 would be a better build idea.