6mm remmington barrel twist.

[22/250]

hi guys been reading up on the 6mm remmington and wanted to know. what would be the best barrel twist to go for if shooting 70 grain bullets upto 100 gain bullets ?

 

[CJ6]

10

 

[JohnnyJohnson]

.244 Remington was 1 in 12

The 6MM Remington is a 1 in 9. The 1 in 9 will shoot the 105 AMax great if you can find them. It will shoot the 70 Gr BlitzKing equally well.

The 80 Gr Blitz (not Blitzking) is also a very good choice.

 

[trappst]

I've had 12, 10 and 8 twist barrels

Currently shooting the 12 twist with 70g Noslers. If you want to shoot anything remotely heavy and low drag, go with the 8 twist.

As JohnnyJohnson said, the Sierra 80g is very accurate and pretty good on coyote fur. Exit holes were only half dollar size.

 

[tiny68]

My Rem 700 Varmint Special was a 1:9.25. Worked great on the light bullets up to the 100 gr. Remmy Core-lokts and 100 gr. Nosler partition bullets. It would not stabilize the 105 SMK. My first one would. It was rebuilt it was a 6mm Ackley - Hart barrelled by Dave Tooley using his suggested 1:9 twist. Sierra told me it wouldn't shoot the 107s. They were wrong. Maybe it is just the extra speed from the AI, but sub-1" 300 yd groups are the norm. Also, shoots the 95 Berger VLD wonderful (my favorite bullet in my 6 Ackley). I newest 6mm Rem is a 28" Shilen 1:12 twist. It loves the 75 VMax at 3620 fps. Coyotes hate it. I can shoot the 87 if I drive it really hard, but it kills the Remmy brass I shoot. As stated above, the 1:8 gives you the potential to shot all sizes.

Luck, Tim

 

[22/250]

so a 1 in 8 will do it all from 75 grain bullets to 105 grain bullets lads. i have seen some unchambered krieger barrels in heavy varmint with the above twist.

so thinking of buying one and keep it till its ready to use. the 75 grain bullets is what i would use most the time. and well the ai looks good it i would more then likely have it chambered in standard 6mm remmington

 

[fullersson]

I'm not familiar with the 6mm remmington chambering, but in my .243 win on an 8 twist I shot Berger 105gr VLD's and they worked really well. I got a wild hair one day and tried the Berger 88gr flat base VLD's and alot of them blew up before they hit the targert at 300 yds. Like I said I'm not familiar with the 6mm remmington chambering but if the 6mm will produce velocities anything like the .243 you may want a slower twist for the 75gr bullets.

 

[22/250]

I'm not familiar with the 6mm remmington chambering, but in my .243 win on an 8 twist I shot Berger 105gr VLD's and they worked really well. I got a wild hair one day and tried the Berger 88gr flat base VLD's and alot of them blew up before they hit the targert at 300 yds. Like I said I'm not familiar with the 6mm remmington chambering but if the 6mm will produce velocities anything like the .243 you may want a slower twist for the 75gr bullets.

thats what i was worried about. maybe a 9 or 10 twist would be better. shame really as the barrels are going cheap.

 

[Steve Blair]

My .244 and 6mm Remington rifles have had 12, 10, 9, 8 and 7.5 twists. 9" is the most versatile twist. It will not stabilize 95 SMK in cold temperatures but the 87 V-Max and Nosler 95 BalTip shoot very well. Berger's 80 flat base varmint bullet is excellent in all twists that I have tried. At the low end, the 58 V-Max is very accurate and can be driven over 4000 fps from 26". I currently have three 6mm Rem rifles. It is a great cartridge that does everything the .243 does, a bit better.

As to bullets disintegrating; the rifling method also contributes. Sharp edges, like conventional cut rifling, seem to exacerbate the problem. I have fired a couple thousand 58 V-Max bullets > 3900 fps in 9, 10 & 12 twists and never had one fail to reach the target.

 

[cooper_m22]

I have a 6mm Remington 10 twist and it does great with 95gr VLDs. Never a problem stabilizing them. Does well with 100gr Rem coreloks and 100gr Partitions as well. Berger 88s are another favorite.

 

[22/250]

i take it alot of the varmint shooters there in the usa who want to push the 75 vmax try and get away with the slowest twist they can.

well this wont let them shoot heavier bullets it will let them drive the 75's at alot quicker speeds then it would out of fast twist ?

 

[CanusLatransSnpr]

i take it alot of the varmint shooters there in the usa who want to push the 75 vmax try and get away with the slow twist they can.

well this wont let them shoot heavier bullets it will let them drive the 75's at alot quicker speeds then it would out of fast twist ?

You are correct with that thought! When a person goes with the minimal amount of twist necessary to stabilize any given length bullet, there is "potential" to get the most speed out of said bullet. There are alot of factors that go into that also. Barrel length, how smooth the bore is, whether or not molly or danzac is being used, if the bore is .236 or .237, 5R or 5C rifling, you see where I'm going with this! Generally that is the case though!

Mike

 

[22/250]

i take it alot of the varmint shooters there in the usa who want to push the 75 vmax try and get away with the slow twist they can.

well this wont let them shoot heavier bullets it will let them drive the 75's at alot quicker speeds then it would out of fast twist ?

You are correct with that thought! When a person goes with the minimal amount of twist necessary to stabilize any given length bullet, there is "potential" to get the most speed out of said bullet. There are alot of factors that go into that also. Barrel length, how smooth the bore is, whether or not molly or danzac is being used, if the bore is .236 or .237, 5R or 5C rifling, you see where I'm going with this! Generally that is the case though!

Mike

so if you are varmint shooting then a 26 inch barrel is the minimum you guys would go to keep fps speed up. i never really had a think about different rifling and how that would affect speed and stability of the bullet.

mike what is the difference between 5r and 5c rifling ?

 

[RJinTexas]

22/250, I've owned about every combo of lenth and twist of 6mm & 6AI barrel over the years. I cut my teeth on a factory BDL Varmint special 24" 9.25tw. It would shoot everything from 55NBT's to 100gr FB Hornady into one ragged hole consistantly producing high to mid .2's. (A 9.25tw won't stabilize a 105gr Amax but it's the most versatile.) I'm a p-dog shooter and do most all my shooting from a bench so long heavy barrels are not a problem but if your want a varmint rifle that will be portable such as one for shooting g-hogs or yotes you don't want a 14lb plus rifle to lug around.

RJ

 

[CanusLatransSnpr]

22/250: There really isn't much difference between 5r and 5c rifling. The 5r means 5 groove ratchet rifling. The 5c means 5 groove canted land. Different manufacturers, different names. Broughton makes the 5c and Krieger makes the 5r, if I'm not mistaken. They are virtually the same except for Broughton is a button rifled barrel and Krieger is cut rifling.

Also, I would say 26" would be a minimum to keep fps speed up. They say you get approximately 25 fps for every inch longer of barrel you go with. Obviously there is a point of diminishing returns with barrel length. Where thats at I honestly don't know.

Mike

 

[jonbearman]

What kind of reciever is the barrel for????

 

[Steve Blair]

The 5r means 5 groove ratchet rifling.

I believe that the "5R" designation originally meant 5 groove "Russian" rifling. Boots Obermeyer obtained a barrel sample from one of the first AKS-74 rifles captured in Afghanistan. He found that the groove sides were sloped and formed a large, symmetrical included angle. The AKS-74 used 4 groove barrels, Boots used 5. The form is reputed to give better life and sealing than conventional rifling forms.

The "ratchet" and "canted land" forms are more similar to each other than to 5R. Both angle toward the trailing edge and produce an asymmetrical form. They are reputed to provide good sealing and reduced skidding tendency. Shilen's "ratchet" form has a shallow trailing edge angle. Broughton's "canted land" actually slopes the top of the land toward the trailing edge.

All the various vendors claim their form is better. YMMV