260 Rem, AI & Imp

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Originally Posted by 25/08IMP

Try win 760 as l had the same problem with 2209 760 was much better.

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I found the opposite, I was developing a load for the 139 Scenar and got pressure real early using w760, could only get them going about 2670 before getting sticky bolt and ejector marks. How do you find the temp stability of 760? Have read it can be quite variable between extremes of temp?

R19 for me in 260. Very nice.

Still early days but got higher speed than 2209 before pressure
Have just got some super primacy to try.


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Originally Posted by HOWA308

Ryan I started out with 2209 and got mid 2700 before pressure.... having some Superformance from my 300wsm I decided to try that knowing it was a slower burner but progressive. Have plenty of room as projectile is seated out at 2.950 COL, giving me about 20thou jump as these projectiles seem to like a close jump. Plus the BC is hard to go past!
Got some load data from the U.S. sites and got close to 2900 but backed of .5gn to allow for hotter weather. Have settled with a respectable 2830 F/S and 140 VLDs.

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Can you tell me what load you are using of super proformance as I have some to try in my 260AI with 130 Swifts

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Start around 45grns and you will be close with superperformance I reckon.

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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

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Originally Posted by HOWA308

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

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Thanks for that I tried it the other day and 47grn with the 130 was good at 2930fps but mine is an AI got some more loads to try yet but looking good.

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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?

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Originally Posted by camo wsm

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?

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Nearly as good as a 7mm08 thats pushing 140 grainers at 2930fps :)

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Originally Posted by 7mmsaum

Nearly as good as a 7mm08 thats pushing 140 grainers at 2930fps :)

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Haha I'm still struggling with my decision to make

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?

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Originally Posted by Proudkiwi

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?

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I would like to know this also :thumbsup:

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.

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Originally Posted by 7mmsaum

Nearly as good as a 7mm08 thats pushing 140 grainers at 2930fps :)

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What's the barrel length Andrew?