Typical Max Velocity For 77 Grain In .223?

[Religious Shooter]

Looking to load up some 77's for my AR15. (Search isn't giving me squat).

Will be using Varget, RL15 and IMR 4895.

What kind of velocities can I expect from a 17" AR15? Listed velocities for those powders are for 24" barrels/fixtures.

Can I get 2750 fps out of a 17"? (I want to bring the smack down to 300+ yard plates and destruction to the closer ones. )

[ErikW]

2750 from a 17"? Sounds too optimistic. I've gone up to 2800 from a 20" and things were a little iffy. But I don't use those powders.

George runs smokin hot 77s with one or two of those powders; I'm sure he'll chime in with more info.

[Religious Shooter]

George is AWOL. What powder(s) did/are you using for the 77's?

[ErikW]

WC846. I think its commercial equivalent is BLC-2.

[Bear1142]

RS

I agree with Erik, 2750 is going to be a tad out of reach with a 17". I would think you'll come in right around high 26 low 2700 fps. I run 75's at 2800, but that's with a 20" barrel.

Don't put too much emphasis on reaching some magical fps. At 300-400 yards, you won't notice the extra 50-75 fps.

If you're going with a 17" barrel, I would recommend you try some slightly faster burning rifle powders. You're going to need a little quicker powder to get those 77's up to speed in a 17" barrel.

Erik