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+--- Thread: IMR 4895 and Heavies (/showthread.php?tid=620)
IMR 4895 and Heavies - notagrendel - 04-18-2022
Since I don't see anyone posting about IMR 4895, even though the 6mm ARC Facebook page with QL data shows promise, I might as well post some findings. I went out to the range to test a few loads with IMR 4895 for velocity, pressure, and function. Velocities are two-shot strings.
Gun: AR-15
Barrel: 18" Proof Research SS
Bolt: JP HP bolt
Muzzle Device: GA Recce 7
Magazine: ASC 6mm ARC 15-rd
Bullet: 108gr Berger Elite Hunter
Lengths: 2.265" (1.650" 3-24 comparator)
Case: *-* 6.5 Grendel once-fired
Lengths: 1.480" (1.185" B350 comparator)
Primer: CCI 450
Velocity ES
25.5gr 2337 fps 5 fps
26.0gr 2398 fps 13 fps
26.5gr 2444 fps 8 fps
Since temp. stability of IMR 4895 is in question overall, I will play with that down the road.
RE: IMR 4895 and Heavies - alwie - 04-18-2022
(04-18-2022, 05:48 AM)notagrendel Wrote: Since I don't see anyone posting about IMR 4895, even though the 6mm ARC Facebook page with QL data shows promise, I might as well post some findings. I went out to the range to test a few loads with IMR 4895 for velocity, pressure, and function. Velocities are two-shot strings.
Gun: AR-15
Barrel: 18" Proof Research SS
Bolt: JP HP bolt
Muzzle Device: GA Recce 7
Magazine: ASC 6mm ARC 15-rd
Bullet: 108gr Berger Elite Hunter
Lengths: 2.265" (1.650" 3-24 comparator)
Case: *-* 6.5 Grendel once-fired
Lengths: 1.480" (1.185" B350 comparator)
Primer: CCI 450
Velocity ES
25.5gr 2337 fps 5 fps
26.0gr 2398 fps 13 fps
26.5gr 2444 fps 8 fps
Since temp. stability of IMR 4895 is in question overall, I will play with that down the road.
How many rounds down your barrel?
Twist rate 1:7.5?
RE: IMR 4895 and Heavies - r.tenorio671 - 04-19-2022
....thanks for posting your results, it's good info for folks that live in locales that have fairly consistent year-round temps.
...I appreciate folks posting their results with various powder/bullet combos, especially as powder variety available isn't what it used to be. I also like to see posts using powders that can be cross-utilized for one of my other calibers, which in this case 4895 is one of the touted powders for 223/556.
RE: IMR 4895 and Heavies - Lemonaid - 04-19-2022
Gorden's reloading tool (GRT) was very accurate in it's predictions of 6 ARC and IMR 4895 and was with in 25 fps or so when I tested it with Hornady 105's. I think 26.5 is pushing the 55K psi limit for a gas gun. From my experience it is also in the powder compression arena.
Thanks for sharing your data. How were the groups?