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.

 

[coleman]

Are you guys using srp or Lrp brass?

 

[willfrye027]

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

I have not had any issues but also do not test it extensively. Most of my loads got worked up in summer and shot from 80-100F. And no issues hitting/killing down to 20F on hunts in the fall. Impacts have been where they should be in a variety of temps but I have not actually measured velocity.

Never tried n150/160. Just n555 (my favorite), n565 (no gain over h1000 for me, also do not have any magnums anymore), and a little bit of n570 (smoking velocity with heavies in fast twist 25-06).

 

[wind gypsy]

Are you guys using srp or Lrp brass?

Both but mostly LRP.

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

I typically set about 50 thou off the lands and let it be unless it doesn’t shoot there. I don’t know what the issue with my gun was but factory and moderate handloads used to just get sticky as it approached 100 rds since prior cleaning. Seemed to get better as it hasn’t done similar in a few hundred rounds.