6mmBR with 8 twist and light bullets

bpost

Would 80 grain Berger FB bullets be over-stabilized in an 8 twist barrel? I am getting low on 105 A-Max's and have 500 of the 80 grain Bergers. Do I have to slow them down some to reduce spin or just stuff it full of Varget and go for it?

haroldchrismeyer

Just send the 80gn bullets to me, because that is what my Sako prefers. I don't think you will have a problem with a quality bullet, but if you launch a real light bullet at a real high velocity with too much twist, they can explode when they leave the barrel. I had a friend that did that, and couldn't figure out why the bullets weren't hitting the paper. He put up paper at ten feet, and still no hole. I can't remember the caliber, but the only explanation was bullet explosion.

mrbruce

No problem at all with the 80 grain Bergers if they will hold together, and they should.....
Only one good way to find out [:D]

nononsense

bpost1958,

I thought you would enjoy reading about a shooter who just set a new NBRSA record using a rifle in your cartridge shooting both the long VLDs and the 80 gr. you're asking about:

"Roger Amos is a long-time friend. We were pleased to see that, while competing at the NBRSA 600-yard Nationals, Roger set a new NBRSA Light Gun 3-target score record of 145-4X. Roger set the record with his 13.4-lb Panda-actioned, 8-twist 6BR, the same gun he shoots in 100/200 yard benchrest matches."

"Fast-Twist Barrels at Short Ranges

Roger tells us that: "I have been shooting 8-twist barrels for several years now at 100-200-300 and they will shoot just as well as a traditional 14-twist (point blank) barrel . IF you use GOOD bullets. I have found that Barts and Fowler 62-68s will stand the extreme rotation associated with 3600+ fps and 1:8" twist. Some bullets can't take it. You just gotta try whatever you have and see for yourself. I have found the most accuracy at 100-200 with the 66-80 grain Fowler bullets or the 80gr Bergers. At 300 yards the 80gr Berger or 90gr Berger BT are excellent! At 600-1000 yards, the Berger 95gr VLDs can outperform the 105s because of their extra speed (although the 95s have a lower BC, their greater velocity can offset the BC advantage of the heavier bullet.)"


Best.

bpost

I have been playing with some 68 Bergers and a top listed load of Varget. No pressure signs yet and accuracy is besting the 105 A-Maxes. I have also tried some IMR 4895 and may be on to something, the groups showing more "roundness" than with Varget.

I found a 500 pack of Barts 68 grain 6MM bullets buried behind some 30 caliber bullets. I plan on testing them over the chronograph at 200 and 300 yards to see how they do. More to follow.