Twist rate for fast 115 dtac

[45acp]

I recently received a Broughton that i ordered a while ago, and mistakenly ordered a 7 twist, rather than a 7.5. I am shooting the 115 at 3200-3300, and the 107 at around 2800 - 3000. Do I have a problem? I am not familiar with a 7 twist - BTW, it is 28" Palma contour.

 

[JER]

7 will be fine. In fact, I prefer to err on the side of too much twist,hardly any downsides) instead of on the side of not enough,plenty of downsides).

 

[45acp]

Thanks for your reply - I think you are correct. I'll know soon enough

 

[ChrisNam]

What will a 1:8 twist barrel do with the 115gr bullets?

 

[rcw3]

If it's a true 6mm 8 twist it should shoot them fine, at least it did in 3 different 1:8" twist barrels I have,2 Harts and 1 Kostyshyn). Keep in mind, some of the 5c Broughton 1:8" twist barrels were,are) not 1:8" twist barrels, but are more in the range of 1:8.25" to 1:8.5" twist. These generally will not stabilize the 115's. I found this out the hard way, I ordered 2 of these barrels, had them chambered up in 6XC, went to shoot the 115's and they would not group at all, however all 105 -107 gr bullets shot well. After going round and round on this I finally measured my barrel twist only to discover the twist of the barrels was not a 1:8" twist.

Robert Whitley

 

[joesr]

45acp...you are shooting the 6CM correct?

1:7" twist is fast given your velicities. However, it should work fine. If I were you I would have ordered a 1:8".

As you know we are shooting 1:7.5" in the Kreigers that are working very good.

Joe Hendricks

 

[45acp]

45acp...you are shooting the 6CM correct?

Probably not...

1:7" twist is fast given your velicities. However, it should work fine. If I were you I would have ordered a 1:8".

I was drunk...

As you know we are shooting 1:7.5" in the Kreigers that are working very good.

Yup...

Joe Hendricks

 

[rhino]

I would go with a 1-7.5 Twist as mentioned. Its kinda like the 6.5, 1-8 or 1-9...how about split it same thing here. Lean on the side of playing it safe.

RHINOUT!

 

[joesr]

The problem is that many of the button rifle barrels only offer twists in 1" increments.

Joe Hendricks

 

[65fan]

hope you guys are wrong about the broughten 1/8 barrels.I will be braking in a 243wssm this weekend with 115 bergers and 115tubs.will let you know if they go sideways at 1k.I sure hope not,should be driving them 3150-3200 in a 30"er.

 

[jb1000br]

martin...they are long...i got near 8.5" too...but the one i tried out of the 6br hit head on,and cut holes with the previous 105 scenar) at 100yds. Report back...

Good luck,
JB

 

[rhino]

Pac-nor makes a four groove 1-7.5 twist. they are pulled button rifled I believe.

RHINOUT!