Originally Posted by
megasupermagnum
I ended up buying a Springfield M1A scout squad a couple weeks ago, and have been having a blast. Now that I feel comfortable with how everything works, I've been sitting down and trying to get some accurate loads. I am not looking for spectacular accuracy here, but 3" at 100 yards would make me happy. My first go around found that my eyes were not up to the task with the targets I was using. A second trip and it seems a NRA style black bullseye target to be the ticket. I only had a couple left, so I took the easy route, and put a 3x Burris scope I had on, just to work up some loads. I have a few molds, but my most promising candidates are the Lee 170 grain and the Saeco 315 clone. I've been using the 315 exclusively, as it fits like a glove. I've got it seated so it does not engrave at all. Just the bore riding nose gets a scratch.
Here is my caveat, I want to avoid case fillers like the coronavirus plague. So far I've been playing with the typical candidates, IMR 4895 and IMR 3031. There is a head spinning amount of information already out there on the M1A, M14, or any 308. One thing I don't see thrown around a lot is the velocity people are getting with their loads. I was working out of the Lyman cast bullet handbook, and it seems that their velocities may be understated. I have not chronographed any of my own loads. For both powders I have worked from 29 to 36 grains. Every single one has cycled without an issue. So far 3031 is the winner, but nothing is quite to the 3 MOA I'm after.
The reason I'm posting is looking for other, less conventional powder possibilities. I have a bunch of powders available, and I wonder if something slower may work better. I see 4350 mentioned from time to time, but no starting load. I have XMP (maybe XMR?) 4350. I also see Reloader 15 mentioned too, but again no start load. One powder I've always been curious about was Reloader 17, which I've had good luck with in some full power jacketed loads. It is also the best powder of choice for the 12 gauge from hell cartridge, which is a 12 gauge brass cartridge loaded to slightly higher than normal pressures, maybe 20-25k psi. This tells me it burns well at low pressures. I have the entire Reloader spectrum, 7, 12, 15, 17, 19, and 22. I do not have the new 16. I've got some 4891SC too. For the extreme slow end, I have RX 22, H1000 and Retumbo. I have a bunch of powder I haven't mentioned here.
So is looking into the slower burn rates a good use of my time for a non-fillered load?