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Author Topic: 6mm Remington rate of twist?  (Read 1971 times)

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Offline the jigger

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6mm Remington rate of twist?
« on: August 12, 2011, 08:45:24 AM »
I want to build a prairie dog rifle. Will the 1 in 8 twist shoot the lighter weight(55gr,65gr) varmint bullets at published veloscities without blowing up? I want the '8 so that I can shoot the heavier bullets but I also want to shoot the lighter ones.
For the past 20yrs or so I have been conscentrating on 22's and 25's. I know nothing about the 6mm other than what I read.
I would like to hear your experiences,especially from any gunsmiths on this forum.
Thanks
GOOD LUCK and GOOD SHOOTING!!!
 
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Offline Lloyd Smale

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Re: 6mm Remington rate of twist?
« Reply #1 on: August 13, 2011, 02:22:21 AM »
i have to ask why you would want a 1 in 8 vs a 1 in 9? One in 9 does real well with 100s and not to many people shoot anything heavier in the 6mm.
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Offline parkergunshop

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Re: 6mm Remington rate of twist?
« Reply #2 on: August 13, 2011, 04:38:46 AM »
Actually the 1 in 10 twist rate does fine with the 6 M/M and .243 rounds.   Note that E. R. Shaw offers the twist rates below.

1 in 12 is too slow for the 100 grain bullets, but works fine with the 60 , 75, 80 grain bullets.   The best all around twist rate is the 1 in 10 for the 90 and 100 grain bullets.

The 1 in 12 rate is generally used with the 6 mm Remington Bench Rest, the 6 MM PPC. the 6x47 and 6x45 for the lighter bullets for target shooting.

The 1 in 8 rate is as Lloyd says for bullets over 100 grains in weight, never saw the need to use one in a 6 m/m.  It is too fast for the lighter bullets especially those under 80 grains in weight.
If you expect to get good performance from the light 55 grain and over 100 grain bullets in the 6 M/M with one twist rate you are going to be disappointed,   You need two barrels one with the slow 1 in 12 twist for the 55 grainers, and a 1 in 10 or 1 in 8 for the heavier bullets.
Shaws twist rates.
 1-8 | 1-10 | 1-12    6mm Rem. Bench Rest6mm PPC6mm Rem. Ack.6mm Rem.6mm-06 6mm/284 6mmx456mmx47.240 Wby..243 Win..243 Ack..243 WSSM
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Offline roper

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Re: 6mm Remington rate of twist?
« Reply #3 on: August 13, 2011, 06:11:47 AM »
Quote from: the jigger on August 12, 2011, 08:45:24 AM
I want to build a prairie dog rifle. Will the 1 in 8 twist shoot the lighter weight(55gr,65gr) varmint bullets at published veloscities without blowing up? I want the '8 so that I can shoot the heavier bullets but I also want to shoot the lighter ones.
For the past 20yrs or so I have been conscentrating on 22's and 25's. I know nothing about the 6mm other than what I read.
I would like to hear your experiences,especially from any gunsmiths on this forum.
Thanks
GOOD LUCK and GOOD SHOOTING!!!

I assume you want the 1/8 twist for the VLD bullets?  You might want to get on this site
http://forum.accurateshooter.com/  those guys are shooting the 1/8 twist barrels and can give you some first hand experience with them and what barrels are best.
 
I've only shot two 1/8 twist barrels 6x284 and 6br both tight neck rifles for the VLD bullets and I had other calibers to shoot the 6mm 60 to 70gr bullets.
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Offline Larry Gibson

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Re: 6mm Remington rate of twist?
« Reply #4 on: August 20, 2011, 07:42:13 AM »
"I want to build a prairie dog rifle."
If that was the main purpose of the rifle i would not compramise with the fast twist to shoot the heavier bullets.  I would go with the standard 12" twist of the .244 Rem (what the 6mm Rem was before they gave it a quicker twist to stabilize 100 gr bullets) .  I've a lot of experience shooting long range rock chucks with the .244 with a 12" twist and a .243 with a 10" twist.  The .244 had it all over the .243 with varmint weight bullets of 75 - 85 gr.  I found the Sierra 85 gr HPBT to be an excellent long range bullet in the .244 on rock chucks and PDs.  The newere ballistic tipped ones are just as good if not better but a bit more expensive.  I tried the lighter weight bullets and found them spectacular at short range (under 500 yards) but found them lacking when compared to the heavier 85 gr bullets from 400 yards+ to 800+ yards.  The higher velocity of the lighter bullets did not make up for the faster loss of that velocity and increased wind drift at longer ranges due to the much lower BC.
Larry Gibson
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