Green Mt barrel 1 in 70 twist

[BrownBear]

Your experience makes me want to ask if you've tried tighter patches in your rifle. That was pretty much my experience with my first TC Hawken until one day I accidentally took the "wrong" patch material to the range. It took a sharp slap on the short starter to get the ball started, but suddenly it was shooting tighter groups and didn't seem to care when I upped the charges.

If you already tried thicker patches and it didn't work, I can sure understand your frustration.

 

[rmonday2]

BrownBear, Yes I have patched it till its unplesant to load and had little to no improvement on accuracy.
I have contemplated making a tool to cut the riffeling deeper but i think i will get me a collrain and fit it to it and let her be! LOL!
I got the parts to build me a Lancaster this winter so i will have something to shoot next spring.I live about 1 hour from Alvin C York's home place and just receintly found they have a shoot each march and hope to attend that event.
Ronnie.

 

[BriR]

I was told that its not the ROT as much as depth of riffeling that Thompson lacked.

That is exactly what Don Stith told me when I was in the process of buying his J&S Hawken components. Hawken rifles may have had only a 1-48" twist, but the the rifling was much deeper as compared to a T/C "Hawken," which made a difference in PRB shooting.

 

[Blackpowdersmoke]

Has anyone had any experience with this particular barrel. I have a 1 in 48 lyman trade rifle and with 75 grns of Goex 3fcan keep 5 shots touchibng at 50 yds. Hard to improve on that.

You're right about that! I have a GM 1:70 twist .54 barrel on a Renegade stock and I wouldn't say it's kickin' my T/C factory barrels butts. I haven't spent a lot of time with this barrel yet and although I have acceptable hunting accuracy, (I took a Deer with it on it's maiden hunting trip)...I feel that I can improve on it. I'm currently using 80gr. of 2F Goex and a .535 Hornady ball wrapped in a .015 Ox-Yoke patch lubed with Wonderlube. Gonna do some experimenting with different combos in the very near future....Bps

 

[Dphar]

Has anyone had any experience with this particular barrel. I have a 1 in 48 lyman trade rifle and with 75 grns of Goex 3fcan keep 5 shots touchibng at 50 yds. Hard to improve on that.

You're right about that! I have a GM 1:70 twist .54 barrel on a Renegade stock and I wouldn't say it's kickin' my T/C factory barrels butts. I haven't spent a lot of time with this barrel yet and although I have acceptable hunting accuracy, (I took a Deer with it on it's maiden hunting trip)...I feel that I can improve on it. I'm currently using 80gr. of 2F Goex and a .535 Hornady ball wrapped in a .015 Ox-Yoke patch lubed with Wonderlube. Gonna do some experimenting with different combos in the very near future....Bps

You may need 100 grains to get best accuracy from the GM using FF.
I have a douglas 1:66 that hates anything less that about 1700 fps.
A 48" twist is not "fast" its a round ball twist. It will also marginally stabilize bullets to about 2 calibers in length or a little less.
TC started using it in their MLs since it was the twist used by Jake and Sam Hawken.
I had an extremely accurate 50 caliber Douglas barrel years ago with a 48 twist. So 90 gr of FFF very well.
Dan