6.5 twist

[zeeker]

Will a 1 in nine twist work for a 260 remington upto 130 gr bullets?

 

[samsplacci71]

Yep. Once you get heavier than 130gr, 1:8 is recommended.

 

[stubblejumper]

My 1 in 9" barrel stabilizes the 142gr Matching , at least in warmer temperatures.

 

[zeeker]

So 130s should work fine.
What's the best length to cut the barrel back to for length?
I have a 30 inch blank to start with.

 

[bulletbox]

I would go with a 28-29 for target rifle....24-26 for a hunting rig

 

[zeeker]

What speed difference on length?

 

[bulletbox]

Around 35-40 fps per inch

 

[zeeker]

So what would you give as an honest velocity from 28"

 

[beeman2]

I believe Berger recommends a 1 in 8 for there 130 gr. I would go 1 in 8. What if you do want to shoot 140's at some point?

 

[bulletbox]

I have mine in 260AI I'm bushing the 140's 2960 With 27 inches of tube

 

[jonh172]

My 27" barrel 1:8 twist comfortably runs 123's at 2950.

But velocity doesn't equal accuracy so build the rifle you want and chrono your loads then calculate your drop chart.
My buddy runs his 139 Scenars at 2750 out of his T3 Sporter and that rifle is extremely accurate to 920.

 

[zeeker]

Is it worth it to do improved or strait 260?

 

[burnaby]

Where do you get brass for improved?
Lapua 260Rem brass is top notch.

Is it worth it to do improved or strait 260?

 

[zeeker]

Fire formed lapua brass

 

[bulletbox]

You gain 120 fps and never have to trim.... It's a toss up man!

 

[rl4930]

Go with the ackley. Even if you just run 260 rem velocity, the need to almost never trim is worth it.

 

[Ganderite]

I have an improved and really like it. You would get back all the velocity you lost by cutting the barrel.

 

[Ryan_mcle]

If you follow the info coming out of the applied ballistics lab, they have found it is very hard to over twist a bullet. They have actually found the bullets maintain their stability future out the faster the twist.
For all long range 6.5 bullets I would recommend a 8 twist.
As for AI I love mine but fire forming is a pain.
Out of a 30 in tube I was getting 2915 with 4831sc. I have cut that barrel to 23.75in and get 2850 with H4350. Out of my 27 in barrel I was getting 2950 with h4350.
All these loads are with Lapua 136L bullets.

Ryan

 

[marcoman]

You gain 120 fps and never have to trim.... It's a toss up man!

All things equal I don't know if there's an extra 100+ fps in the AI over a standard .260Rem.
A couple buddies shoot this cartridge and IIRC both are at approximately 2850fps with 140's. Both have 26" barrels.I know of a few .260's pushing 140's at 2840ish from 24-26" tubes.
Depending on chamber/throat/etc, I'd say its 50fps superior.

Some people fire form with full house loads so this process doesnt have to be an inconvenience. No question brass lasts longer and with less maintenance.