Best 556 Powder?

[markm]

@Markm: I didn't know H335 was so flashy. All my guns have proper flash hiders so the limited desert shooting I do at night I didn't notice much. If I switch to a different powder and get a lower flash signature that is a benefit.

I did a test years back with an 11.5 barrel that had the A2 flash hider. I shot W748 against H335, and it was night and day so to speak. The 748 load was actually hotter velocity wise, but gave no flash. H335 was super flash.

[B52U]

Another TAC vote here as I shoot mostly heavy bullets and it meters so easy on the dillon 550. I have used cfe223 but found it more finicky in load development and extremely dirty for carbon fouling.

[Deerhunter_28]

I like AR Comp, CFE223 and Varget.
I’ve used all 3 out to 600 with 77 SMK.
Also the AR Comp performed very well with 62 FMJBT.
All of 77 SMK are under 1 MOA if I do my part.
20” Heavy Wilson Combat barrel.

1 in 8 twist
All was in 2,700 FPS range.
AR Comp only varied in 7 FPS in 10 rounds on chronograph.
Others were in 20 FPS range.


Sent from my iPhone using Tapatalk

[markm]

8208 XBR is an exceptional powder for heavier bullet weights and my go-to for 77 and 80 grain bullets. If you can find any, stock up.

It falls in that high "ullage" category referenced in the Primer/bullet movement study by the Army Research Lab.

[IALoder]

Out of those three, TAC. I use it with everything from 55-77 grain loads and it performs well across the board. Practically speaking, it meters very well in progressives and is available at the moment while being relatively cheap.

This. TAC is also great in .308. XBR is also a great powder for covering 50-77gr as has already been posted, and meters very well for a stick powder.

[Henny]

I use H322 and like it so far

This and, or 8208XR.

Added benefit of both powders being temperature stable and meter well!

[Krazykarl]

I will be the weird one and suggest N540. Only powder that I have ever used where my measured velocities agreed with published data. Rifle used was 20" Colt A4. N540 from this rifle produced best precision with increasing velocity. 69gr Nosler was the projectile.

[markm]

I will be the weird one and suggest N540. Only powder that I have ever used where my measured velocities agreed with published data. Rifle used was 20" Colt A4. N540 from this rifle produced best precision with increasing velocity. 69gr Nosler was the projectile.

I've never tried the Vitavouri line. I was afraid I'd like it too much.

[gaijin]

Truth. I used n320 for 9mm range load.
Crazy consistent, burned clean enough the glass on optic never got “smoked” like a lot of powders.
Fortunately it became unavailable for months and I moved on. Twice the amount of my current powder for same price.
Very good stuff though.

[gunnerblue]

QUOTE=Krazykarl;3057985]I will be the weird one and suggest N540. Only powder that I have ever used where my measured velocities agreed with published data. Rifle used was 20" Colt A4. N540 from this rifle produced best precision with increasing velocity. 69gr Nosler was the projectile.[/QUOTE]

Some manufacturers publish data gleaned from test barrels and universal receivers. Hornady used to (and may still) list the specific firearm used to gather velocity