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Hodgdon Superperformance Powder for 6.8 SPC

8K views 3 replies 3 participants last post by  AKsarben 
#1 ·
I did a search and there is some stuff on the Hodgon Superperformance powder, but it's many months old, so I bring this back to quiz. Any data on the Hodgdon Superperformance of the CFE 223 powders for load data on the 6.8 SPC II?
http://www.hodgdon.com/rifle.html
 
#2 · (Edited)
CFE 223 sounds like the powder St Marks made for the new 5.56 green ammo.

Looking at the load data for CFE 223 I can tell you it will be way to slow, close to BLC-2, TAC, AA2520 in burn rate.

Lead Free 5.56mm BALL POWDER® Propellant
I
• BALL POWDER® Propellant designed for lead-free projectiles and primers
• Propellant additives developed for barrel decoppering

Green 5.56mm BALL POWDER® Propellant
Projectile 62.0 grain, 20" barrel
Propellant 5.56mm round Velocity(ft/s) Pressure(psi)

WC 844 - Standard M855 3020 55,000
SMP® 842 - Green 5.56mm 3020 54,200
This is the powder we need(to try anyway, may not be as good as 2200), I had a line on some a while back and lost it before I could get any.

6.8mm REM SPC vs. 5.56mm M855

5.56mm M855 projectile 62.0 gr, 6.8mm projectile 115 gr, barrel 16"
Propellant Round Velocity(ft/s) K.E.(lbf-ft) Pressure(psi)
WC 844 - 5.56mm M855 2900 1157 55,000
SMP® 745 - 6.8mm REM SPC 2500 1593 53,000

•6.8mm has ~40% more K.E. than the standard 5.56mm
 
#4 ·
I found the burn rate chart... finally, and it does show it to be a rather slower burn powder. Others showed a lot more promise, and I even seen some loading from Hodgdon for one they have called "Lil' Gun", which may be a bit on the fast side.

FWIW, one I have had very good success with for accurate loads is IMR's powder 8208XBR. I find that loading the case nearly full, 1/8" down from the neck, and tapping to settle the powder gives you a pretty decent compressed load, with great accuracy and no signs of excessive pressure on my 2 uppers of 6.8 SPC II - One from Harrison Beene a 16" 1:11.25 twist with 5R rifiling and the other a 4 groove 1:11 twist from Bison, but in 18" barrel. Both shooting the 100gr bullets of Speer and Sierra. Believe that was around 30 gr of IMR 8208 XBR.
 
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