1-9 twist 6.5 ??

[Weezer]

I have had good luck with 130gn with 1-9, and 130, 140's with 1-8.5. Do you think I could get by with 140 Bergers @ 3000fps and 4000ft altitude with 1-9 ?? Thanks for any input. Weezer

 

[rscott5028]

I don't know the length of those bullets. I use SMKs that measure 1.355" and I know they work well with 1:8" twist.

You can run the numbers on JBM's website and see what they say. But, my guess is that you'll be ok.

JBM Stability Calculator... JBM - Calculations - Stability

-- richard

 

[Shooter264]

What Catridge? If you were shooting them fast enough, then yes, you would be fine. If you were shooting them less than 2900ish I would say it would be a gamble. Just my .02

 

[Weezer]

Thanks for the info. The caliber I had in mind is a 6.5xRoberts AI or 6.5-06 A Sq. AI as I have reamers for them. Weezer

 

[Oliveralan]

I shoot 140 VLDs at 3441fps from my 6.5mm Voodoo with 1-9twist at 300ft altitude with zero problems, very good performance actually!

 

[trebark]

What do you lose by going with 1:8? You can shoot both 130 and 140 grain bullets with that rate of twist. Whereas it seems questionable to go 1:9 with the 140.

 

[benchracer]

I have a 6.5x55 with a 1:9 twist. It shoots Berger 140 VLD's very accurately whether they are loaded fast or slow. I have not chronoed my loads, but the Berger 140's have shot well even with starting loads (42.2g H4831), less than 1000ft. above sea level, @ 45*F.

I say give the Bergers a shot.

 

[remingtonman_25_06]

My 264 Win Mag is a 1-9" and is stabilizing the 140g amax out to 625 yards.

It says 1-7.5" on the bullet box...

MV is 3000-3100fps, about 1000ft ASL, 40-50 degrees.