Vihtavouri N540 or N550 powder

[CWQ]

I have run out of RL 15. Should I use Vihtavouri N540 or N550 powder.

I am shooting 175 grain Sierra Match Kings with an Accuracy International 308, 24" barrel, model AE Mk 3 with a 1:12 twist rate.

many thanks

 

[Michael Eichele]

N540 for up to 190s in some barrels, n530 in others and n550 yet in others. I'd start with 540. I've run a lot of 540 and 550 in 308s running 168s up to the 208s. 540 has been stellar in both accuracy and velocity for 168-190. 550 is better for the heavies.

 

[CWQ]

Thanks, I was leaning to 540 and you confirmed it.

 

[Popapi]

Were you using RL15 for the bullets you mentioned???