Re: Powder for the 308 ?
Last week I went out to buy some powder, and of course, my usual stuff was sold out. I bought a few pounds of various powders that I had been wanting to try for a while, and three of them REALLY are performing OUTSTANDING, and I just had to mention them:
IMR 4007 SSC - this is a newer powder from IMR, which is supposed to be between 4320 and 4350 for burn rate (sorta like RL-17), so it is on the slow side for .308. Since it is so slow, I only loaded it with 175 SMKs and 178 A-Maxs, and shot from my 26" bbl Rem 700 - and got outstanding accuracy, 5 shot groups at 0.46". Velocity was a bit slow (2608 from a 26" bbl), but the accuracy was great. I don't think this powder would work very well for lighter bullets, or with shorter barrels. I bought this powder for .243 and .30-06, since they were out of 4350 and RL-19.
Accurate 2495 - basically Accurate's version of IMR 4895 and H4895, although some burn rate charts list it as being a tiny bit slower. I have made some exceptional loads for this for 68, 69, and 77gr. match .223 loads - and is getting outstanding speed and accuracy.
This powder in the .308, is grouping extremely well with my 155gr. SMK-P's and 168gr. SMK's, and 165 gr. SST's. Haven't tried it yet with the 175/178gr. bullets, but so far, I am getting better accuracy and speed with this powder than I am with Varget, and my AR10 is running it extremely well. A very versatile powder, can be used from .223 all the way up to some magnums.
Accurate 4100 - Completely off topic, I know, but I had to mention it. I needed some Alliant 2400 for my .357 Mag and .44 Mag loads, but they were out, and my usual replacements (H-110, N-110, Lil-gun, AA No.9, W296) were also out. I checked the burn rate charts and seen that this powder was designed for .410 and magnum handgun loads, and has a burn rate between 2400 and H110. I have not yet tried it in .44 yet, but let me tell you, this is my ONE AND ONLY .357 Mag powder!! I loaded some 140, 158, and 170gr. bullets, and all of them were super accurate, didn't need magnum primers, and was almost as fast as H-110, but with less pressure (in my opinion from shooting), and faster than 2400. Load data is rather limited, but AA recommends using data for AA No.9 and increasing that data by 3% (4100 is a tiny bit slower than No.9). This is shooting from my 6" bbl S&W M686. I am right now putting together some 240gr. JHP's for my 4" bbl. S&W M629 .44 Mag - I hope it performs as well as the .357 did!
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