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Posted On: 10/6/2020
A: Hi David! I'm happy to say you've found the right ammo right here. Just in case you didn't know, 7.62x51 shares identical dimensions to commercial 308 Win – it's just loaded to a slightly lesser pressure, so a 308 rifle can handle it just fine. This round's very heavy bullet brakes its muzzle velocity out of a rifle to 1,000 fps. That's about 125 fps slower than the speed of sound, so it doesn't issue a pronounced, cracking report when it exits the muzzle. Your suppressor will have a lot less noise to muffle when you run this ammo, making it a natural choice for your plan to do some quiet shooting.
Please let me know if you ever need anything else!
Posted On: 9/27/2020
A: I don't believe this ammo should give an M1A SOCOM 16 any trouble, but I'm not familiar enough with the rifle to give you a definitive answer. Please give me a moment while I reach out to Springfield to get their opinion. I'll update this comment as soon as I hear back from them!
Posted On: 9/18/2020
A: Hi Tim! I'm afraid S&B hasn't released this round's ballistic data yet (although they're usually pretty good about that), and we haven't chronographed it ourselves either. That said, I have found ballistic data for a somewhat analogous round. Brown Bear Subsonic has a 7.62x39 load with a 196 grain bullet and 1,115 fps muzzle velocity. It's faster, of course, but its 0.383 G1 ballistic coefficient gives it these ballistic data when zeroed in at 25 yards:
Range Elevation Energy Vel
(yd) (in) (ft.lbf) (ft/s)
0 -1.50 541 1115
50 -0.34 503 1075
100 -6.71 472 1041
150 -21.10 445 1011
200 -44.00 421 984
I wish I could give you a closer analogy, but that ought to give you at least some sense of what to expect from S&B's subsonic load. I hope this helps!
Posted On: 9/14/2020
A: Hi Rick! I'm happy to do that math for you. For the purpose of this exercise let us assume we're firing a 7 lb rifle, and also that each cartridge has 45 grains of propellant.
NATO (150.5 gr, 2,809 fps): 19.01 ft lbs recoil energy
S&B Subsonic (200 gr, 1,000 fps): 8.18 ft lbs recoil energy
Based on that, I'd estimate this subsonic round's recoil energy is about half of what a NATO round ought to deliver. It's not a precise calculation but I hope it helps!
Posted On: 9/12/2020
A: Hi Mike! Ammo muzzle velocities are measured in feet per second (fps), and 80 mph is equal to 117 fps. I'm afraid no such ammo exists, 308 Win or otherwise. Even a 22 LR without propellant is going to deliver a muzzle velocity above 400 fps. Regardless, if you're looking for low-powered ammo with which to break in a rifle, you're not going to find much lower powered ammo than this one by S&B.