6mm br

[maddysdad]

given a 108 grain bullet ,how fast would it be going out of a 1/8 twist barrel that is 28 inches long and what would be the powders of choice for it

 

[KenOath]

given a 108 grain bullet ,how fast would it be going out of a 1/8 twist barrel that is 28 inches long and what would be the powders of choice for it

In my experience anywhere between 2800-2850 FPS with 30gns +- Varget..

 

[JFrank]

Mine runs roughly 2830 FPS

 

[Falfan2017]

Varget, h4895, rl15 are common. Whatever you can find these days.

 

[Wingnut00]

30.2 gr. Of varget, 108 Berger .003 off lands, 2882 over ten shots from a 28” barrel is what I’m getting.

 

[Dgd6mm]

I'm running my 6br with a 105 and IMR4895. PRS rifle.

 

[moondog]

108s in mine with Varget is running at 2830.

 

[NorCalMikie]

Never checked mine. All going in the same hole so why bother. Don't fix it if it ain't broke. Same with my 22 BR and my 6.8 BR Wildcat.
Don't go looking for trouble. You just might find it.

 

[gambleone]

RL-15 , varget or h4895.

 

[Eraser]

Never checked mine. All going in the same hole so why bother. Don't fix it if it ain't broke. Same with my 22 BR and my 6.8 BR Wildcat.
Don't go looking for trouble. You just might find it.

What kind of answerer was that?
The guy is looking for advice and you come up with "Never checked mine. All going in the same hole so why bother."

 

[byrddog]

I've owned several of them. Never ran 30 grains of varget in one. Seemed like 29.8 and lower always gave over 2800 fps or a little faster and accuracy and velocity spreads were always good. If you're looking for over 2900 with a 105, use another case. minimal speed increases really do nothing for downrange ballistics, but fouling definitely increases higher pressures. I've used imr 4166 with good results as well, but varget just seemed to always work well for me. As others stated, varget, reloder 15, h4895 and either n150 or n140 have worked well.