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Reduced power op rod spring for m1a
- Thread starter IrvJr
- Start date
No, I supposed you can always cut coils.
How low do you want to go?
In my testing, and I have conducted a lot more than the data below, you get below 2400 fps in a match M1a's or Garand, and the thing does not shoot well.
These were designed to function within a limited pressure curve, and the things shoot best at service ammunition pressures and velocities.
PAT2520 is Pat's surplus AA2520.
How low do you want to go?
In my testing, and I have conducted a lot more than the data below, you get below 2400 fps in a match M1a's or Garand, and the thing does not shoot well.
These were designed to function within a limited pressure curve, and the things shoot best at service ammunition pressures and velocities.
PAT2520 is Pat's surplus AA2520.
Code:
[SIZE="3"]M1a Super match 1:10 Douglas barrel.
174 FMJBT 39.0 grs PAT2520 wtd Mixed LC, WSR(brass) OAL 2.800
T = 50 °F 10-Mar-02
Ave Vel = 2335
Std Dev = 25
ES = 82
Low = 2282
High = 2364
N = 10
poor group
174 FMJBT 40.0 grs PAT2520 wtd Mixed LC, WSR(brass) OAL 2.800
T = 50 °F 10-Mar-02
Ave Vel = 2375
Std Dev = 21
ES = 71
Low = 2336
High = 2407
N = 9
better group
174 FMJBT 41.0 grs PAT2520 wtd Lot 6095 Mixed LC, WSR(brass) OAL 2.800
T = 50 °F 10-Mar-02
Ave Vel = 2469
Std Dev = 22
ES = 72
Low = 2422
High = 2494
N = 10
good group
168 Nosler 42.0 grs PAT 2520 wtd Lot 6095, WLR (brass) Mixed LC OAL 2.800
18-Aug-02
Ave Vel = 2598
Std Dev = 27
ES = 77
Low = 2552
High = 2629
N = 10
very good 10 round group
[/SIZE]Slamfire - Thanks for your reply. I don't know how low I'd go. I guess if it's low enough I would manually work the bolt and use it as a single shot rifle.
The reason why I ask is because I'm thinking of getting a SOCOM 16 (16" barrel M1a). I've heard the muzzle blast is fairly significant with the short barrel and muzzle brake. I often shoot at a range that has an enclosed shooting area and I wanted to develop some lower powered ammo that would be less noisey for me and the other shooters on the line.
Have you tried any lower power loads with a lighter bullet? I would mostly be shooting 200/300 yards max with this gun so I was thinking of going with a lighter (maybe 125/130gr) bullet.
Thanks again for your post.
The reason why I ask is because I'm thinking of getting a SOCOM 16 (16" barrel M1a). I've heard the muzzle blast is fairly significant with the short barrel and muzzle brake. I often shoot at a range that has an enclosed shooting area and I wanted to develop some lower powered ammo that would be less noisey for me and the other shooters on the line.
Have you tried any lower power loads with a lighter bullet? I would mostly be shooting 200/300 yards max with this gun so I was thinking of going with a lighter (maybe 125/130gr) bullet.
Thanks again for your post.
...lower powered ammo that would be less noisey for me and the other shooters on the line.
Here's a link to some loads using Trail Boss, including .308 -
http://www.imrpowder.com/PDF/Trail-Boss-data.pdf
I'm not sure how much quieter reduced loads are going to be. If you are looking for something like a .38 Spl for noise, you might have to go to a powder puff load.
And, while I've read of shooting reduced .30-06 loads in 03 Springfields, these generally used lead bullets to reduce the probability of a squib. Lead bullets in gas guns introduce other problems.
The reason why I ask is because I'm thinking of getting a SOCOM 16 (16" barrel M1a). I've heard the muzzle blast is fairly significant with the short barrel and muzzle brake.
The SOCOM has a different gas system, so I don't know whether or not Slamfire's data will be correct for you.
Jason
Hi Hawk 7313,
Thanks for your reply.
I looked into the Schuster plug, but I think that when the adjustable valve is fully seated, it operates like a normal gas plug. I think I would need a plug that would increase the pressure on the op rod since the low powered ammo would create less pressure than a standard round and might not generate enough momentum to cycle the action reliably.
Am I correct? I've never seen a Schuster plug in real life, but I did look at the Schuster Mfg. website and read the description for their M1 plugs.
Thanks again for your reply.
Thanks for your reply.
I looked into the Schuster plug, but I think that when the adjustable valve is fully seated, it operates like a normal gas plug. I think I would need a plug that would increase the pressure on the op rod since the low powered ammo would create less pressure than a standard round and might not generate enough momentum to cycle the action reliably.
Am I correct? I've never seen a Schuster plug in real life, but I did look at the Schuster Mfg. website and read the description for their M1 plugs.
Thanks again for your reply.