chrome_austex
Member
- Joined
- Apr 10, 2008
- Messages
- 496
I picked up a new Rem 700 20" threaded barrel w/ 1 in 10 twist (intended for subsonic suppressed loads?).
Does anyone have any good advice on what bullet weights to try for this faster-than-usual twist?
I've been trying to feed it 155 grain Secnar bullets which I had left over from a previous gun. These were @ 2.830 OAL 'mag-length' over 45.1 grains of IMR 4064, full-len resized, hornady match brass and CCI BR2 primers. Best accuracy is meh with 5 shot groups of 3" at 200y @ 2715 fps and only gets worse with slightly less powder. I'm wondering if I haven't yet found the powder sweet spot or if this gun just dislikes the 155s.
The gun does seem to like Federal Match ammo (168 gr) with 2" groups at 200y @ 2520 fps out of the short 20" barrel.
I notice the Federal Match ammo has R-P stamped brass. Am I giving up anything by using Hornady Match brass? I've also got a little Nosler brass I could try. Up till now all rounds through the gun were full-length resized. My next attempts will be neck sized only now that I have some brass fired through this chamber to work from.
Should I be looking heavier than 168gr ?
Does anyone have any good advice on what bullet weights to try for this faster-than-usual twist?
I've been trying to feed it 155 grain Secnar bullets which I had left over from a previous gun. These were @ 2.830 OAL 'mag-length' over 45.1 grains of IMR 4064, full-len resized, hornady match brass and CCI BR2 primers. Best accuracy is meh with 5 shot groups of 3" at 200y @ 2715 fps and only gets worse with slightly less powder. I'm wondering if I haven't yet found the powder sweet spot or if this gun just dislikes the 155s.
The gun does seem to like Federal Match ammo (168 gr) with 2" groups at 200y @ 2520 fps out of the short 20" barrel.
I notice the Federal Match ammo has R-P stamped brass. Am I giving up anything by using Hornady Match brass? I've also got a little Nosler brass I could try. Up till now all rounds through the gun were full-length resized. My next attempts will be neck sized only now that I have some brass fired through this chamber to work from.
Should I be looking heavier than 168gr ?