how many of you gentlemen own/use a 6.8 spc AR clone?

Grumpy

The Grumpy Grease Monkey mechanical engineer.
Staff member
how many of you gentlemen own/use a 6.8 spc cartridge, AR clone?

I have the opportunity to swap a almost new 223 ar15 I own, with an 18" thin light weight barrel,
for an almost new 6.8 spc caliber AR clone, with a stainless varmint weight 20" barrel.
a friend purchased this 6.8 spc thinking it would be the ideal hog hunting rifle ,
but because he doesn't handload like I do, he's almost in panic mode as he has had a very hard time finding 6.8 spc ammo locally,
and he tells me he made a huge mistake, because he has on several occasions wanted to go out to shoot, and could not find ammo,
( Yeah I understand his concerns, yeah I'd agree with his assessment
it sucks if you can't buy ammo, and don't have the tools & knowledge to load your own ammo!)

I looked around and found everything I need to reload except empty brass in the first 20 minutes, looking online!
Im certain that brass is available someplace, in 100 cartridge boxes,
and Im rather intrigued at the deal, as I have a couple 223 ar clones but no 6.8 spc version yet
so other than the scarcity of that particular caliber ammo,
are there any downsides to the 6.8 AR clone?
yeah I know it requires magazines that are matched and won't feed from 223 mags
how does it work on hogs?
 
Last edited:

The 6.8 SPC ammo normally uses 75-120gr bullets, with 85gr, 110gr, 115gr, and 120gr bullets being the most common.
but you can certainly use the 130-140 grain projectiles if you are willing to limit shots to 250 yards and under, most of the time,
The 6.8 SPC is also loaded to a slightly higher pressure than the 6.5 Grendel (55,000psi vs 52,000psi).

You should be able to use 5.56 magazines with the 6.8 SPC round.
Magazines designed exclusively for the 6.8 SPC caliber exist,
simply because not all 5.56 magazines work consistently with the 6.8 SPC bullet.











 
Last edited:

as with most cartridges a balance must be found where projectile velocity allows consistent repeatable accuracy, decent range and acceptable and consistent expansion on impact, at safe pressures that allow you to load a bunch of ammo for future use, select a light weight and you get good velocity but rarely longer range accuracy and penetration generally suffers, go to heavy and the projectile tends to penetrate well but may not expand consistently on impact and the drop in trajectory at longer ranges due to lower initial velocity tends to make hits at ranges over lets say 200-300 yard with a rifle noticeably harder to make consistently as judging exact range tends to be critical to making consistent hits
playing with a ballistic calculator says a 200 yard zero using a 6.8 spc cartridge,
should produce hits at about 300 yards at about 10" low,

using a 130 grain bullet linked below, certainly adequate for most deer hunting and personal defensive usage!
this also packs a noticeable increase in impact energy over a 223 cartridge in any AR15 clone

you can use the 120 grain bullet for a bit more velocity and flatter trajectory

6.8 spc ammo like this is vastly preferred for hunting

25 -25.5 grains reloader 10x powder and a mag primer under a 130 grain bullets seems to be listed several places as a good combo



 
Last edited:
Back
Top