8 twist 6BR with 55 or 58gr projectiles?

[6.5grendel]

I currently use an AR in 223 for hunting coyotes at night but was wanting to give my 6BR a try to see how it would do. I have never shot anything light out of it before. I planned on always shooting heavies out of it so it is a 26" .104 freebore with 8 twist. Would I be able to shoot 55 noslers or 58 vmax out of it without them spinning too fast and coming apart? I'm thinking muzzle velocity will be around 3600-3700fps. Has anyone shot either of these with an 8 twist barrel? I'm not looking for exceptional accuracy, just looking for a flatter trajectory and more energy on impact.

 

[Hoot]

I will also be pursuing that as well, once comfortable shooting weather returns up here. I know from the previous owner that its a laser with 105 Hybrids over Varget. That's the low hanging fruit. I love to experiment. Good Luck and don't feel like you gotta hit the max velocity. Faster twist, faster RPM for the same velocity. Maybe go a little slower without risking instability. Besides, they're short little buggers!

Hoot

 

[Clancy]

Been shooting coyotes with a BR since 2018 or so. Never missed with that gun. This was Saturday night.

I use a 13.5 and 68 grain BR bullets, but several of my friends use an 8 twist. I’d highly recommend a 65 V-Max or 70 Varmageddon. They don’t get pushed around as bad. The twist won’t be a problem in a case that size.

 

[762plinker]

yes my 2 cents worth is you are going too lite....move to the 70 area

 

[OMW57]

70 grain nosler ballistic tips here with 14 twist, Cooper Montana Varminter 6BR, MAN the coyotes REALLY HATE that rifle!

 

[Clancy]

N135 and a Federal 205, by the way.

 

[urbanrifleman]

Yes. You'll be fine.

 

[ARW]

I have a 6BRA with a 9 twist Krieger HV that is my groundhog and crow gun. I wanted speed so I tried 55gr. Bal. tips, 58gr. V-Max, 58gr. Z-Max, 65gr. V-Max, 75gr. V-Max and 70gr. Bal. tips.
The clear winner in the accuracy department was the 58gr. Z-Max at .2 to .3 groups at 100yds. at a little over 4000fps. and next was the 58gr. V-Max at .4 to .5 groups at little over 3900fps.

I had no pressure signs with any of these, even in 90 degree summer temperatures, and all of the bullets I tried held up fine in my 9 twist barrel.

 

[Hoot]

To that end. I swapped out a wrist brace assy for a pistol stub on a friends 9mm AR and he offered to get me a pound of powder for the 15 minutes it took. (I didn't tell him it only took 15) I gave him my "mildly interested" list and he showed up a few days later with a pound of LT-32. (wasn't at the top) So, my question is, Generally speaking, how much should a prudent reloader reduce these charge weights from Accurate Powder to accommodate an 8 twist vs a 14 twist that they used? Cases are 4-F Lapua, not Remington.

Thanks,

Hoot
hijacker of threads

 

[Bill Norris]

To that end. I swapped out a wrist brace assy for a pistol stub on a friends 9mm AR and he offered to get me a pound of powder for the 15 minutes it took. (I didn't tell him it only took 15) I gave him my "mildly interested" list and he showed up a few days later with a pound of LT-32. (wasn't at the top) So, my question is, Generally speaking, how much should a prudent reloader reduce these charge weights from Accurate Powder to accommodate an 8 twist vs a 14 twist that they used? Cases are 4-F Lapua, not Remington.

Thanks,

Hoot
hijacker of threads

I normally start in the middle of the charge window and work up .3 per increment.

 

[rabbit fingers]

I use 55gr Sierra blitz kings in an 8twist br. @3700fps and no problem getting to the target, accuracy plenty good enough for small varmints.

 

[6.5grendel]

Thank you everyone. I'm going to give the 58 vmax's a try.

 

[ARW]

Out of all the light 6mm bullets, the 58gr. V-Max is probably the most readily available and reasonably priced too.

Good luck.