6.8 Rem SPC build

[wxl]

Great build. Bison suppose to have great barrels. Guess their specs is the SPCII chamber, 1/11 twist 4 groove?

I have a YHM 16" barrel upper SPCII but the faster 1/10" twist but wanted one for hunting with a slower twist. Just picked up a second hand upper with the 18" Bison SPCII 1/11" 4 twist (have not shot it yet) to see how much velocity gain I can get over the YHM barrel with my reloads.

[Grizzman]

Thanks for the feedback guys.

Yes, their website says SPCII 1:11 4 groove for the recon profile barrels.

They state in their FAQ that the velocity gain in their barrels from 16 to 18" is approximately 50 fps.

Since I handload, I should be able to get good velocity if I use powder of the right burning rate, and it'll be fun finding that powder.

[wxl]

There are not alot of recipes in the books. Most of those were for the original SPC Remington and are low powered. The SPCII allows higher pressure and I think SSA and Hornady are the only ones loading for the SPCII (SSA loads both standard and the hotter Tac loads). There are probably only 4 companies loading 6.8.
Also there are brass with large primers and small, general conscensus is the small primer case handles pressure better.

If you have not checked, there is a great forum (Home of the 6.8) that has a ton of info. Kind of the pioneers who took the original spec to the improved and tons of load development with all kinds of powders, etc.

[Grizzman]

My plan was to use the books for only a basis for powder recommendation. I plan to ignore the upper limits and work off of velocities and pressure signs. It's not an ideal situation, but it'll work fine.

I also have a subscription to loaddata.com, which may have data not contained in the standard manuals. I just bought some H335 today (haven't found any Alliant 10X in a store yet), and still need to order some bullets online. The two stores I've been in haven't stocked a bullet fully appropriate to the 6.8 SPC.

Even if I don't reach the capabilities of the cartridge, It'll far surpass anything the 5.56 is capable of achieving.

Forgot to add, I'm a member of the 6.8 forum, but haven't spent very much time there.........yet.

[jmlutz]

Good Luck with with the rest of your build, that's going to be a BadAss AR Mike

[Grizzman]

Here's an update. The BCM receiver extension, castle nut, and Magpul Miad arrived in the mail today.

The Superior Shooting Systems CS buffer and magazine springs have been ordered and are in the mail.

I just received an e-mail telling me that LMT shipped out the SOPMPOD.

I'm down to ordering an LPK and lower receiver, which I won't do till the barrel shows up.

Come on Bison.......you're holding up the show.

[Grizzman]

Here's another update on my build:

UPS attempted to deliver the barrel last Friday while I was out of town on business. Looks like I'll work from home on Monday so I can receive it. It's a win-win to me.

I just ordered a 2 MOA Aimpoint CompML3 in a LaRue LT-129 cantilever mount that I'll use as the primary optic. I also ordered an LT-707 in-line mount for the Surefire 6P LED.

I plan to put the first rounds through it next weekend.