H4350 eqvailent in vihtavuor powder

[Lawnboi]

I’m curious are you guys seating your bullets close to the lands when you are having pressure issues after 100 rounds? 39 gr of h4350 seems low to be having pressure issues. I just built a 6 creed and will be starting some load dev here. Hoping n555 will give me what I want out of an 18” barrel. Thanks

It started life with 105 hybrids at .040 off jam. I didn’t have any major issues till the rifle hit 900 rounds and would just pressure up over the course of match. The rifle had a.150 freebore, so slightly shorter than saami, but it only got fed 105 hybrids, the reason for going with the slightly shorter fb.

The barrel was a hammer though. I swapped to h4831sc for the last few matches of the year and had no issues running similar velocity.

This was only one barrel. My other had zero issues with h4350. That said if I were buying a new 6 creed barrel today I would go with a little slower powder. I had no issues with the case being too full at realistic velocities.

 

[willfrye027]

I’ve burned through close to 20lbs of n555 and tried it in 22, 6, 25, and 6.5 creedmoor cases. Groups are equal or smaller for n555, velocity anywhere from 50-100fps for the same “pressure signs”. It’s a great powder and I prefer it over h4350.

 

[Lawnboi]

I’ve burned through close to 20lbs of n555 and tried it in 22, 6, 25, and 6.5 creedmoor cases. Groups are equal or smaller for n555, velocity anywhere from 50-100fps for the same “pressure signs”. It’s a great powder and I prefer it over h4350.

How has temp stability been for you? Always looking for h4350 alternatives.

Ever shoot any n150/160? I’m starting to try and shoot more VV powder just because it’s cheaper

 

[eoperator]

How has temp stability been for you?

Iirc my 6cm n555 had 35fps swing from 40° to -10° last winter.