Slow twist 6BR?

[Sniper338]

Ive been kicking around ideas trying to figure out how to spend money I dont have.

A slow twist 6BR, I dont see many post on this subject. I built my wife an 8 twist? Could be 7.5 twist.. shoots 105 berger vlds fabulously... since then ive been jelous and want a 6BR too.

However Im thinking about 65-95 gr bullets instead of the 105s...

What twist rate would be best for some lighter bullets? 10 or 12 twist?

What speeds are yall seeing with lighter bullets?

Ive kicked around the idea of a dasher, a brx, a brxd, bra.... and well, I got regular ol BR dies already, and the dang this just plain ol shoots as it is... 100-150 fps gain doesnt do much for me when this barrel would only see inside 300 yards 95% of its intended use... yep hunting.. I got so tickled to death over such light recoil with the 105s, a smaller bullet should be even smoother shooting...

However this begs to be asked, if Im only gonna play inside 300... would the 6 PPC pushing 65-90 gr bullets be a one step up? How would they vompare in velocity with the same bullet, same barrel length?

 

[lpreddick]

I have two slow twist 6 BRS, a 12 and a 14 twist.. I shoot paper and varmints...ghogs. My 14 tw will stabilize and one hole bullets up to 70 gr, esp custom 65-68 gr. A 12 tw will shoot 80 gr nicely. A PPC will require a smaller bolt face than the BR. I can get 3500 fps with a 65 gr bullet and not trash the brass. Barrel life is very long if you don't prairie dog hunt.

 

[Sniper338]

I have two slow twist 6 BRS, a 12 and a 14 twist.. I shoot paper and varmints...ghogs. My 14 tw will stabilize and one hole bullets up to 70 gr, esp custom 65-68 gr. A 12 tw will shoot 80 gr nicely. A PPC will require a smaller bolt face than the BR. I can get 3500 fps with a 65 gr bullet and not trash the brass. Barrel life is very long if you don't prairie dog hunt.

Is a 6BR with the lighter bullets breaking 3000 fps easily?

 

[CT10ring]

Ive been kicking around ideas trying to figure out how to spend money I dont have.

A slow twist 6BR, I dont see many post on this subject. I built my wife an 8 twist? Could be 7.5 twist.. shoots 105 berger vlds fabulously... since then ive been jelous and want a 6BR too.

However Im thinking about 65-95 gr bullets instead of the 105s...

What twist rate would be best for some lighter bullets? 10 or 12 twist?

What speeds are yall seeing with lighter bullets?

Ive kicked around the idea of a dasher, a brx, a brxd, bra.... and well, I got regular ol BR dies already, and the dang this just plain ol shoots as it is... 100-150 fps gain doesnt do much for me when this barrel would only see inside 300 yards 95% of its intended use... yep hunting.. I got so tickled to death over such light recoil with the 105s, a smaller bullet should be even smoother shooting...

However this begs to be asked, if Im only gonna play inside 300... would the 6 PPC pushing 65-90 gr bullets be a one step up? How would they vompare in velocity with the same bullet, same barrel length?

I have a 6BR 14 twist, built by Greg Tannel - Stiller singleshot action, krieger HV 26" bbl. I don't know the velocity, but it will handle 58g-75g well. I use Vmaxes for PD shooting. Bergers are more accurate but the Vmax are plenty accurate for my needs. I feel it's good to 350-400 yds. for my needs.

 

[Toby Bradshaw]

Is a 6BR with the lighter bullets breaking 3000 fps easily?

A 6PPC will shoot 3300-3400 fps with 65-68gr bullets, and the case capacity of a 6BR is larger than the PPC.

More here:
http://www.accurateshooter.com/cartridge-guides/6mmbr/

 

[alinwa]

I have 6BR's in 14.5, 14, 13, 12, 10, 8 and 7.5 and a couple gainers that go under 7.5. I haven't shot them for a while but I have books full of notes. I'll try from memory.

Some things;
- as far as bullet weight the BR case will push bullets 95 and under over 3000fps.... CAREFULLY and with custom dies and small firing pin diameter. The old 88LD was a favorite of mine for sagerats in the wind and I ran it at 3050 in the field, through temp swings etc.

- as far as "best twist" IMO an 8 simply does it all..... Yes, I've blown up a lot of bullets but I've never popped a Nosler Ballistic Tip of any sort in any weight and;

- the little NBT's are wikkid accurate even from the tight 8" twist. IME the BR case will push 55gr bullets up to 3350 comfortably. Not as fast as the 6PPC, but still plenty fast and with the 8" twist you pick up a TON of free rotational energy.

I personally don't remember ever getting the velocities lpreddick lists above but I'm not arguing it. That last 100-200fps is VERY equipment-specific! I remember many yrs ago (mid-90's??) coming on to BRC and talking about running 105's at 2900 and getting laffed off the planet, vilified even, ridiculed......

Now everybody does it.

And this website exists

 

[swd]

The 95SMK needs a 9". Great bullet. I shot a lot of them out of a 6x45 at 2800. I would think a PPC and BR would push if not exceed 3000. Either would make a dandy coyote/deer combo.

 

[Flyshooter]

Slow twist 6BR.......I really don't want to state the obvious however for the sake of friendly chatter and the fact it's too cold outside to do much more then read these forums. Well I'll convey a thought or two regarding slow twist 6BR's.
If one is looking to shoot 55 to 70 grain bullets for the purpose of target shooting or varmints then you'll want a suitable freebore. Also if most of one's shots are less then 400/300yd's and your an individual that enjoys hitting praire dogs or similar rodents with atomic clock like regularity......then yes.....a properly chambered slow twist 6BR is a great choice.

This is a realization that has been demonstrated many many many times over.

I'd acquired a 6BR zero freebore reamer and for some reason can't seem to stop building various slow twist 6BR's...??? There is a barge load of used 6PPC barrels out there which easily convert to 6BR varmint/target rifles.

Velocity's with 55gr bullets easily exceed 3700fps and 65gr easily exceed 3500fps all the while shooting tiny little groups.
Powders like RL-7, AA2230, H322, H335, N135, N133, 8208 etc etc in conjunction with Lapua brass and a mag primer......along with a muzzle brake and wow......sit down at the bench and spin the 2" spinner at 300yd's until you get hungry or the spinner pivot point over heats and seizes up.

Sounds a little over the top.......well......I've have or had just about every varmint caliber there is or did have at one time.....but to load for and shoot tight with almost no effort nothing beat a zero freebore slow twist 6BR....that's my story.

Fast twist 6BR's and 105 grain bullets with a .104 freebore are almost as much fun at 600yd's.........but this thread is about slow twist 6BR's.

 

[John from MN]

I tried the 95 grain Sierra TMK in 2 different 9.25 twist Remington factory barrels chambered in 243 and neither handled them well. Can't say the 95 grain Bergers have ever given me trouble when fired through the same twist.

Honestly, if the 95's are on the table I would stick with an 8 twist. The 6br isn't terribly hard on light bullets.

 

[rkittine]

I have one 13.5 Twist 6MM barrel that shoots 55-65 grainers well to 300 yards.

 

[SDWhirlwind]

Built myself a 6BR in 2008 with Krieger 14TW HV finished @26". Bought the reamer used on one of the forums and it is a no turn nk(.275) and freebore was long for 100gr range of bullet. Only bullets I have ever shot are 65 Vmax and 220rds of 70 TNT on pdogs. All but the 220 TNT were 65 Vmax. Had 3jugs of 2015BR setting around and it is ideal in this rig. 30gr for TNT and 30.5 for Vmax. OAL is 2.180" for Vmax and 2.210 for TNT and I have not changed it since first rds. RP 71/2. I haven't shot a 'group' with it since first ones when I worked up powder. It has 1406rds down it with original 100rds of R-P brass. The 2 bullets will shoot from .25 to .5 inches of each other at 100yd. and up to 3410fps depending on temp and powder lot but generally 3300ish. I don't push them hard. Either bullets just flat slaps the snot out of a pdog. The closer the more gruesome. Have shot them out to almost 500yds but most generally in the 300-400 before I even take it out. Under 300 is for the 222mag, 223, 222, Fireball or Bee. I don't have nobody to brag to so generally if my choices are over 400 or go home to my recliner. With all the out of staters anymore and nearly every private town poisoned my recliner gets to suffer with my fat arse much more frequently. Also it has the first model B&L 6-24 receiver mounted scope. I have shot to verify zero numerous times and never had to change it so don't think there is much throat erosion.

Chambered a Rock 8tw RV contour my brother thought had a bad chamber that was initially cut to 6XC. Done a couple yrs back but just haven't had the energy the last couple yrs to mess with it using Berger 95VLD or such and see if it is a questionable barrel. I think it was more 'pilot error'?lol Anyhoo the 6BR is a hoot as was a 22BR I had for a bit. Cheap to shoot with the powder load I use. Just can't find nothing wrong with it, especially for a pdog gun. Well, except I have't been able to use it more.

Respectfully,
Dennis

 

[powderbrake]

The 8 twist 6BR works great with 88gr Bergers at about 3100fps. It also works well with 105 Berger hybrids. I haven't shot any lighter bullets because I like the higher BC of the heavier bullets.

I would recommend against a 6PPC with the lighter bullets. Why do all that case modification when a stock 6BR will do the job?

 

[alinwa]

......................

- the little NBT's are wikkid accurate even from the tight 8" twist. IME the BR case will push 55gr bullets up to 3350 comfortably. Not as fast as the 6PPC, but still plenty fast and with the 8" twist you pick up a TON of free rotational energy.




I personally don't remember ever getting the velocities lpreddick lists above but I'm not arguing it............................

I just realized in revisiting this thread that I misspoke. (mis-remembered, brain-farted, shot a squib....?? )

Somehow I read lpreddick's post as "85gr" not "65gr" ...... probably because I've never shot a 65 to the best of my recollection....all the bullets I personally shoot in that range are 66,68 and 70 grains. As happens often my brain and my eyes see something other than my memory ........

so;

- The little 55gr NBT's ARE NOT limited to 3350, I'm 300fps off! More like "3650 easily" whereas the 6PPC, a BENCHREST 6PPC, will run a little more pressure in my experience, easily cruising at 3750 altho both cases are typically capable of 100-150fps more with varmint-length barrels.


-and YES, I completely agree with lpreddick's figure of 3500fps with 65's

 

[divingin]

I've got a Bat B/Krieger 1:13.5; with 31gn Varget, it shoots the 64.2 Berger columns to about .3" or better at 100yds (don't have easy access to anything longer.)

 

[4xforfun]

Don't have a BR, but my 12 twist dasher is AWESOME with the 65 V-MAX. Powder puff load of H335 at 3600 and itty bitty groups makes for lots of red mist!!! BBL should last a long time...brass should last FOREVER!!

 

[Spook]

If I ever were going to shoot light 6mm bullets specifically, I'd go with a 6 Grendel.

 

[swadiver]

I've got a Bat B/Krieger 1:13.5; with 31gn Varget, it shoots the 64.2 Berger columns to about .3" or better at 100yds (don't have easy access to anything longer.)

try Benchmark with Columns. worked for me

 

[rkittine]

I also like Columns (my recent batch are 64.4 Gr) and will try Benchmark,

Bob

 

[divingin]

try Benchmark with Columns. worked for me

Thanks, swadiver. I have a pound of Benchmark I was going to try. Guess I have to now.

 

[GSPV]

I shot a 1:10 for a long time. About 80 thou freebore. The Berger 90 grain boattail target was awesome. The 87 VLD hunting was good, but a bit harder to tune. I have a bunch of the BIB 95 grain flatbase laying around. I tried them. Sometimes they would shoot like a laser and sometimes throw one. Turns out that I didn’t have enough freebore and was getting into the donut.

At any rate, a 1:10 will handle boat tails up to 90 grains. Anything heavier had better be afloat base. But, keep the freebore firmly in mind.