25-284 win powders?

[Brandon.miller.4]

Recently built a 25-284 win on a tikka with a 21" barrel. I'm very satisfied with where I've ended up as far as a load/accuracy/velocity/etc. But....I'm curious. Currently I'm using lapua brass with a berger 133 hybrid hunter seated at the neck/shoulder junction and roughly 15k off the lands, loaded with 55.5 grains h1000. Gun consistently shoots .5" 5 shot groups and .8-.9" 10 shot groups at a mv of 2950.

What I've noticed is that my case fill is a ways below the shoulder but I hit pressure if I go 1 grain higher. I don't feel that I NEED to change anything, as it meets my expectations fully. However, I've always wanted to try vihtavuori powders and I think n570 might be the one to grab and experiment with. I like to tinker.

What say you reloading nerds? And no I'm not trying rl26 or retumbo. I want something I can somewhat find!

 

[B23]

2950 is actually pretty fast w/H1000 and a 21 inch pipe. N570 has long fat grains and is a very bulky powder. I'm not sure you'd be able to get enough N570 in the case to out run your H1000 load. RL26 is likely going to get you some of the best velocities but if you can't get your hands on any that'll pretty much eliminate that option.

I'd look for some N565 maybe N560 or even H4831 and give those a go before I tried N570.

 

[Brandon.miller.4]

2950 is actually pretty fast w/H1000 and a 21 inch pipe. N570 has long fat grains and is a very bulky powder. I'm not sure you'd be able to get enough N570 in the case to out run your H1000 load. RL26 is likely going to get you some of the best velocities but if you can't get your hands on any that'll pretty much eliminate that option.

I'd look for some N565 maybe N560 or even H4831 and give those a go before I tried N570.

That's what I was looking for in a response thank you. I tried 4831 and it didn't produce anywhere close to the velocities or h1000, looks like I'll stick with what I got!

 

[Nbowlin]

I have a 280AI case pushed out more and it Barely clears enough 570 to do its thing. 135 at 3280.