I am having my first 6BR built and not sure if I want to go for the 109 bergers, 105’s or the 112 barnes. I was not having much luck searching for loads with a straight BR to stabilize a 109 or 112 bullet. If I were sticking with just the 105 I think I would go with a 1-8 but with the newer bullets I’m thinking a 1-7 or 1-7.5. Plan would be to have the build in 6BR with 28” bartlien the. When needed have it rechambered to a 6BRA and cut it to 25 or so and keep about the same speed. I understand I’d have to get a new die but that cost I think would be minimal for changing calibers in a year or two.
Straight 6BR. 1-8 or 1-7 twist
- Thread starter Justinmac13
- Start date
CaptainMal
Silver $$ Contributor
What are you going to do with it?
Asking that question because in a target rifle you just may be wearing out the barrel each year or so. Re-chambering costs 1/2 the price of a barrel and if it is a used barrel and you use it, it is sure not worth the effort.
As a regular BR you will be rather slow for the heavier bullets so the faster the twist the better to keep things stabilized if you are shooting say 600 or 1,000 yards. That's why I asked.
Asking that question because in a target rifle you just may be wearing out the barrel each year or so. Re-chambering costs 1/2 the price of a barrel and if it is a used barrel and you use it, it is sure not worth the effort.
As a regular BR you will be rather slow for the heavier bullets so the faster the twist the better to keep things stabilized if you are shooting say 600 or 1,000 yards. That's why I asked.
it will be used for target and PRS from 300 to 1100, I live close to the smith and it wouldn’t take much to set it back when the time comes, hopefully from what I hear I should be able to get 2500 or so, not qui
Ranger188
Silver $$ Contributor
If your going to shoot PRS out to 1000+ yds. the 6br is a little under gunned.
For 600 yd matches it's perfect.
Pick the Dasher, 6BRA, 6GT or 6x47 Those will buck the wind better at distance.
Too answer your question. If your not sure what weight you will shoot
a 8tw is ok, but the 112 and heavier will work better at distance with a 7.5
You don't need a 7 tw
For 600 yd matches it's perfect.
Pick the Dasher, 6BRA, 6GT or 6x47 Those will buck the wind better at distance.
Too answer your question. If your not sure what weight you will shoot
a 8tw is ok, but the 112 and heavier will work better at distance with a 7.5
You don't need a 7 tw
I have a 8 twist Criterian that is 28” long. It is chambered in 6BR. It is screwed into a Origin action, BnA trigger and Steiner M7.
It shoots 115g DTACs great. I am running 32g of H4350 and getting a velocity of 2,775. I am using Lapua brass and FGMM primers.
I have no problem hitting steel at 1,080 yards. I can hit 6” plates at 600 yards with boring regularity.
As long as you know your drops you don’t need to push it to max velocity.
It shoots 115g DTACs great. I am running 32g of H4350 and getting a velocity of 2,775. I am using Lapua brass and FGMM primers.
I have no problem hitting steel at 1,080 yards. I can hit 6” plates at 600 yards with boring regularity.
As long as you know your drops you don’t need to push it to max velocity.
TylerFromMS
Gold $$ Contributor
I switched from an 8 twist to a 7.5 after I got a lot of 105 hybrids that measured .020 longer than the other ones I had. It was slinging the longer ones everywhere. It tightened back up after that. I shoot at about 300ft elevation for whatever that's worth. I haven't found an issue with the 7.5 twist shooting 109s in a dasher, either.
Nice, I had not read anyone shooting 4350 and 115’s from a straight BR. The reamer the smith is using is a 104 FB, do you see any issues with the 109’s or 112’s in the .104 FB. From what I have been reading the difference from a 28” BR and a 24-26” BRA is pretty negligible when it comes to MV. Hard to tell for sure as the info I have is just from forums from guys I do not know. Having no experience with the 6BR it just seems like a 109-115 is kind of pushing it for that little cartridge.
I usually take a quick look using the Berger calculator to see what twist is recommended for the environment I'll be shooting...
https://bergerbullets.com/twist-rate-calculator/
there was a related post regarding 109s.
http://forum.accurateshooter.com/threads/6br-the-berger-109-varget.4006055/
https://bergerbullets.com/twist-rate-calculator/
there was a related post regarding 109s.
http://forum.accurateshooter.com/threads/6br-the-berger-109-varget.4006055/
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SHall
Silver $$ Contributor
Bingo!! Read no further!!
Thx for the calculator, looks like a 7.5 will be good. yes I read that thread you posted, all two posts of it was not much info which was why I posted this thread.
rkittine
Gold $$ Contributor
I do not use anything heavier than 107s in my 6BR. Have had good luck with them out to 1,000 yards. Not winning size groups, but small enough to take a woodchuck out at that range. My barrel is 1:8 and I started using 90 and 105 grainers. If I was to rebuild for the 107 Tipped Sierra's I think I would go with 1:7.5
Bob
Bob
I would go with a 7.75 and play with the heavies till you get it out of your system and it works well the 103 to 105's .... I do use the 7.75 and it will shoot the 110 a tips with regularity in the zero's and ES in the single digits from a BR IMP. and it will just hammer the same with Barts 105... I just got some 109 Berger to try but I started sorting and I don't think I want to go there...... jim
Jim
I have ordered 100 of, 105 hybrids, 109 hybrids, Sierra 107’s and Barnes 112’s. I’m guessing that there is too much irregularities you are seeing in the batch of 109’s or what’s the issue?
From what I see on David Tubb's website and video's, he uses a 7 twist for the 115 DTAC in 6xc at about 3000FPS. Altitude, and outside temp comes into play when trying to get the max BC out of a projectile. I shoot 105's to 115's of various manufactures and I wouldn't have an 8 twist. Then again I live at sea level.
Liven The Dream
Gold $$ Contributor
I measure these things... base to ogive, bearing surface, over all length and weight. the one one I see on there would be having a good chance of being uniform is the 107's. Not saying you can't get lucky and get a good lot of Bergers I did once, look and see people looking foe Berger 105 hybrid by lot #. The 109's I started checking and I had four piles and I was only through less than a hundred..... you need some more let me know.... The Hornady 110 A tip is as good as you can get for a production bullet and on par with custom bullets..... jim
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