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+--- Thread: 6mmAR loads. (/showthread.php?tid=11034)
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6mmAR loads. - 454bore - 03-20-2016
Been shooting a Grendel necked down to 6mm and it shoots well with 107 grain sierra match kings,95 grain ballistic tips,and 70 grain tnt's.
Nothing has gone over and inch.
The 107 SMK's shoot the best.
Usually around half to 3/4 inch using 27.5 grains H-4895 and 31 grains CFE.
XBR8208 shoots well also but can spike easy on pressure so been using CFE and H-4895 the most now.
The 107SMK's have a B.C. of .530 and will try them at 300 and 500 yards later.
This variant is a lot of fun to work with.
6mmAR loads. - Vasux86 - 03-20-2016
What velocities are you getting?
6mmAR loads. - 454bore - 03-20-2016
I haven't shot any loads through a chrono yet.
With a 22 inch barrel the CFE load with the 107 SMK is probably be around 2700 fps.
6mmAR loads. - 454bore - 04-17-2016
Did some shooting through a chrono and got 2660 fps with the 107SMK using H-4895.
2910 with 87 grain V-max using CFE.
2710 with 105 A-max using XBR 8208.
I've been turning 2 thou off the necks for more consistant neck tension and less pressure.
6mmAR loads. - am4966 - 04-17-2016
I had always wondered what Cartridge they use for the 6mm/AR
6mmAR loads. - 204 AR - 04-17-2016
Good info 454, I built a 243lbc this spring, also with a 22" barrel, 1-8 twist. It's quickly becoming my favorite. I'm mainly loading 55 gr varmageddons right now as I have a bunch of them. 31.6 gr of 8208 seems mild and runs 3450. I've had them close to 3600 but want max brass and barrel life. I am going to work on some loads with a2495, I'm up to 30.7, just shooting and looking for pressure signs, no crony or accuracy data yet. I also will be working on a load with 85 gr sierra bthp as I have a bunch of them and will use them for bigger game and longer ranges. Early data with them had them at 3020 fps using 29 gr of 8208 and bughole groups.
No chance to work with bigger bullets but I've read that the 95 gr smk is ideal, with a .480 bc and speeds over 2900 fps.
6mmAR loads. - 454bore - 04-17-2016
The 95 SMK does look pretty good.
The 87 V-max zeroed at 200 needs 5 moa come up at 400 yards and the 105 A-max needs 5.5 so the lighter bullet is a little flatter.
The 105 has more energy though and makes a better deer hunting bullet.
It can pass through up to 600 yards usually.
They're a lot like a ballistic tip.
They're both still over 2000 fps at 400 yards.
The berger 95 grain VLD hunting bullet is very good also.
What I like a lot about the 6mmAR is you can use bullets from 55 to 107 grains and they're all usually easy to get and cheap.
I can get the 105 A-max for 21 bucks per 100.
It has shot some very small groups at 600 and 1000 yards.
6mmAR loads. - Huckleberry75 - 07-12-2018
Tag for later. Glad to see some info on the lighter pills.
6mmAR loads. - Popeye212 - 07-13-2018
What barrels are you guys using about to build and upper in the 6mm AR?
6mmAR loads. - Trapper - 07-14-2018
I am using a Columbia River arms barrel in .243lbc, 22", 8 twist, it's the same as the 6mmAR and the 6mm Predator. Columbia makes the barrels for Black Hole Weaponry. They use polygonal rifling which give you about 100-200 fps more speed because of the way the rifling is cut.
6mmAR loads. - 204 AR - 07-14-2018
I now have 2, both 22" 1-8, one the bhw and one an arp. They run neck and neck for speeds and drops. The bhw might have a slight accuracy edge but it's close. I use 87 vmax almost exclusively now with imr 8208 as it's proven to be a good coyote bullet, bucks the wind great and doesn't drop much more than the light bullets at medium range and kicks their butt further out with much less drift. Barrel life? Who knows, the bhw has somewhere between 1500 and 2k rounds and still looks good in the bore scope.
6mmAR loads. - Popeye212 - 07-14-2018
Trapper Wrote:I am using a Columbia River arms barrel in .243lbc, 22", 8 twist, it's the same as the 6mmAR and the 6mm Predator. Columbia makes the barrels for Black Hole Weaponry. They use polygonal rifling which give you about 100-200 fps more speed because of the way the rifling is cut.
So what dies do you order and is it not formed from the Grendel brass. That was where I was headed using the Grendel case. My other question is the bolt fit on ARP barrel extension proprietary to the his barrels. In other words will .136 BCG I have fit.
6mmAR loads. - grayfox - 07-14-2018
Popeye212 Wrote:So what dies do you order and is it not formed from the Grendel brass. That was where I was headed using the Grendel case. My other question is the bolt fit on ARP barrel extension proprietary to the his barrels. In other words will .136 BCG I have fit.
The other thing to verify on Arp barrel extensions/bolts is whether the lug pattern is proprietary. The one Arp I had a few yrs ago had a different lug pattern somehow so it would only take his bolt, with a matching set of lugs. Which is ok, if you don't mind, as long as you can get his bolts... IIRC it was a more rounded shape at the lug/boltface intersect instead of squarish.
6mmAR loads. - 204 AR - 07-14-2018
The arp bbl ext on the predator is standard, set for .136" bolts.
I use a Grendel bushing die, with .266 bushing for Hdy brass. You will need a couple intermediate ones for necking down the first time. Then a Hdy 6mm seater die.
6mmAR loads. - Kswhitetails - 07-14-2018
So, something like a .254, then a 242/1?
6mmAR loads. - StoneHendge - 07-14-2018
BHW tells you how to do it.
http://blackholeweaponry.proboards.com/thread/1874/make-load-243-lbc-brass
6mmAR loads. - 204 AR - 07-15-2018
No like 280, 270 then 266.
6mmAR loads. - Popeye212 - 07-15-2018
I have a set of .243 dies can they be used for seating or is the Rem. 6mm needed for case diameter. Gotta mark this thread for reference. Better yet I have the Forster Benchrest Seater die might call Monday and see if they can do something with the seater as change out .264 to .243.
6mmAR loads. - 204 AR - 07-15-2018
No we use the Hornady die because it has a floating sleeve and works with any case diameter, so if you do a 6.8 necked down to 6, or a 6x45 it would work for those also, or 6br, 6ppc, etc. Normal 243 seating die would leave the skinny grendel case rattling around in there unsupported.
https://www.midwayusa.com/product/1011035763/hornady-custom-grade-new-dimension-bullet-seater-die pick 6mm ppc, but if you look most have the same product number.
sizer: https://www.midwayusa.com/product/754248/redding-type-s-bushing-full-length-sizer-die then add the bushings and you're all set.
6mmAR loads. - Popeye212 - 07-15-2018
Ok thanks thanks for the info. This is the Grendel seating die I have already:
https://www.midsouthshooterssupply.com/item/00070u00059/ultra-micrometer-seater-die-for-6half-grendel
It has a sleeve that supports the case as it goes in.
Wondering if it will work with this:
https://www.forsterproducts.com/product/bench-rest-seater-die-seating-stems/