6.8 Rem SPC build

[Grizzman]

Thanks.

I ordered the first upper part on April 29, and the last on May 17th.

I won't be too surprised if I end up with all of the lower parts before the barrel shows up.

[jmlutz]

That's going to be a fine AR Mike

[Thedragonslayer]

Very nice !!! Look forward to seeing it finished and ready to shoot!

[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.