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Barrels

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Steve 2141
Steve 2141's picture
Barrels

Does anyone know of progressive twist rate barrels being used in F Class for 6 x 47 Lapua with 105gn-107gn pills.If so what twist rates and makes.

Thanks

Geoff319
Geoff319's picture
G'Day Steve, a 1:8" twist 27"

G'Day Steve,
a 1:8" twist 27" maddco is what i use with Sierra 107's. Heavier bullets are avaialble but you will need a faster twist. Besides there are numerous bullets available in the 100-108gn range for F class/LR shooting.

I haven't chronied my load yet but estimate 3100fps based on elevations out to 500m.

I use 2209 and CCI magnum primers, start around 37.5gn and work up. I got to 39.5gns in my Hall with a small firing pin and was getting light cratering of the primer. 2213sc is another prefered powder.

The rifle/load shoots a whole lot like a 6PPC on steroids! Bloody Bewdiful!

Hope this helps

Cheerio Geoff

Geoff319
Geoff319's picture
G'day Steve, these cases will

G'day Steve,
these cases will get a soft bump from a Redding comp FLS bushing die to give around 1-2thou max resize. The bolt lift on the Hall is reasonably soft even with the slight cratering on the primer (firing pin has been bushed and is smaller than the std Hall f/pin diameter)so I know I can stoke it up if needed. Firstly, I'll fire (season) the cases 3 time before I up the load to see if i can get more out of them, much like a ppc case.

Either way the performance is right up there where I want it. So it is all good!

sorry dont know of any gain twist barrel makers..........

Cheerio Geoff

Micky T
Micky T's picture
Steve are you talking about Gain twist barrels?

If you are, then try this write up on gain twist barrels. http://accurateshooter.wordpress.com/2008/08/22/boyer-succeeds-with-bart...
Cheers Mick

RFBR HOF#1
Steve 2141
Steve 2141's picture
Gain Twist, Progressive Twist, Incremental Twist

Thanks for that Mick, I had already read that article, I was just speculating if anyone had recently tried one of these "Gain Twist" barrels and what was the outcome, as long range shooting is such a different animal compaired to short range benchrest.

Also Geoff, I get 3050 out of my Improved 6BR with 105 Bergers and need to FLS every shot, how hard is your load on your brass to get 3100, are you FLS or just necking your cases.

Thanks

DaveP
Have not seen anyone using a

Have not seen anyone using a gain twist barrel. I have a Lilja 3 groove in heavy varmit profile which works very well in the 6x47L.
I have cronographed loads with 39.5 2209 at 3150 - 3170 using 105 Lapua scenars and they group well from 100m to 1000yds, still have some testing to do yet though.

cheers
DaveP

jim mckinnie
jim mckinnie's picture
gunna give the dark side a crack

Just wondering how much free bore would be needed for a 6br to run 105ish scenars or match kings

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