![]() I didn't have the same problem as AA2520, but I couldn't get 123's moving faster than 2500. I was trying to find something about the speed/pressure as AA2520. So, I stepped up the load, and in Winter it worked great. Resultant swipe was from too low of an initial pressure with too slow of a powder. The high pressure pushed early on the BC trying to unlock the bolt. WTH? What I found was the temp sensitive powder that didn't burn fast enough was burning too far down the barrel, and put too much pressure back through the gas system. Summer loads were trashing brass in the cold Minnesota winters. I got the best velocity out of it (until I tried 8208), but I had to work loads up for summer and winter in Minnesota. It becomes really evident when you load temp intolerant powders like AA2520. The rifle never had the gas system adjusted for that. The 6.5 G has about 20% more case capacity than a 5.56, which the rifle's gas system was designed around. So, what I found with about 3k rounds downrange. Lapua, Sierra SMK's and Hornady A-max's did. Berger VLD types don't work so well with that. Obviously you need a depth tolerant bullet. of 8208, with the bullet pushed way back off the lands. This may seem totally odd, but what I ended up doing with my last Grendel, a 24" Satern barrel, was 29 gr. I've certainly had my share of frustration. That's good you are keeping such tabs on what you do with the Grendel. To put my experience in perspective, I'm probably approaching ~10k rounds total of Grendel fired (nearly 6k in one barrel), have used ~1 dozen barrels, and have burned ~25 lbs of AR-Comp. (Uses ~3+ grains more powder.)ĪR-Comp has also been very accurate for me in 223 with 69gr bullets, and in 260 with 123gr.Įxamples of AR-Comp (w/ 123gr) that I have pics of include 5- and 10-shot groups at 100 yards using a Satern barrel:Īnd here's the Satern-tailored load used in a Shilen: Burn rate is quite slow compared to AR-C and 8208. ![]() With max loads, it's unmistakably harder on the weapon if tuned for other powders. ![]() AR-C will usually be more accurate, and 8208 will yield slightly more speed.ĬFE-223 (and Leverevolution) is the velocity king in the Grendel, but at the expense of temp sensitivity. Using 123gr bullets, 27.7gr of AR-C or 8208 often works very well. 8208 seems to have somewhat of a fine line between safe and excessively hot loads. A weapon is less likely to short-stroke with AR-C, and recoil is drawn out into more of a push. This might seem odd, but my perception is that AR-C's burn rate is slower than 8208, but in the Grendel case, its max charge is slightly less than 8208. Velocity is respectable, but not the best. AR-Comp has been the most accurate in the dozen or so barrels (and powders) that I've used. ![]()
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