Help me work up an M1A load...


March 23, 2013, 02:02 PM
I don't have a reloading setup but I will have one soon, I don't have an M1A Scout Squad either but I will have one soon...

Anyway, I want a load for the M1A Scout Squad that will have

-Low muzzle blast
-Low recoil (as low as it can be keeping in mind that this is a semi-auto)
-Good accuracy
-Reasonably low cost
-Enough power to cycle the action

Any suggestions?

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March 23, 2013, 02:22 PM
I dunno man. There is so much data for the match 308 loadings. I think 41.7 grains of IMR 4895 and the Sierra 168 MK in military match brass has been one of the go to loads for years.

You might start there.

March 23, 2013, 03:03 PM
The needs of each weapon are never the same.

I load for an early M1A (brown fiberglass stock with the switch cutout filled). I use the same loading as I worked up (up is not a direction in this case) for use in a Remington Model 600. To make that 600 shoot-able, it is just too light, the loads run 2468 FPS out of that 18.5 inch barrel. Out of the M1A's 22 inch barrel, that load runs 2677 FPS. To my great pleasure, this one load is quite acceptable in both.

My suggestion is to select a bullet with a powder type that shows greater spreat and work from their. I like 150 grain sp bullets and H or IMR 4895 powders.

March 23, 2013, 11:26 PM
Every rifle is different, but I have found that 147 gr bullets in front of 42.0 gr of IMR4895 will work very well in an M1A, a full auto M14, FAL, and .30 BMG set up for 7.62 x 51. One load for 4 very different weapons. Wonderful!!

March 25, 2013, 08:51 AM
41.5 grains of IMR 4895 with a 168 gr Sierra Matchking is a decades proven load for the 22 inch barrel M1A. You may try adjusting it slightly to get the best accuracy out of your rifle.

March 25, 2013, 12:26 PM
Low muzzle blast? LOL

Lose the "brake" first. ;)

March 31, 2013, 11:39 PM
IMR 3031. Some guy over at did a through test and IMR 3031 was the winner.

April 1, 2013, 12:35 AM
I use 43.5 grains of reloader 15 with a 158 gr bullet. Seems to work pretty good for me.

April 1, 2013, 02:28 PM
My favorite .308 powders is IMR4064 and it can be used with the Gas system in the M1A.
For more inexpensive ammo give WC846 a try, the non-canister version of BL-C(2).

For a lot of good information on the 308/7.62mm NATO try the site linked to below.

Good luck and have fun...

Float Pilot
April 1, 2013, 03:15 PM
My 16.5 inch barreled M-1A shorty experiments
This is a cut down military issue barrel.

Bullet: 135gr Sierra Match King
LC-82 brass, CCI BR-2
2.804 col roll crimp
Vel= 2,960 fps average
Main Group : 0.75 inch ( first and last round from magazine flyers to 1.5in)

135gr SMK
45.0gr H-335
LC-82, CCI BR-2
2.804 col, roll crimp
Vel= 2,842 fps average
Main Group= 3.0 inches

135gr SMK
41.7gr IMR-3031
LC-82, CCI BR-2
2.804 col, roll crimp
Vel= 2,691 fps average
Main Group: 1.20 inch, first and last round from mag flyers out to 2.0 inch

135gr SMK
44.8gr Benchmark (I have 20 pounds of it)
LC-82, BR-2
2.804 col, NO CRIMP
Group= 1.75 inch Horizontal string

135gr SMK
44.5gr Benchmark
LC-82, BR-2
2.804 col NO CRIMP
Group= 2.5 inch Horizontal string

150gr SMK
42.0gr Benchmark
Fed, BR-2
2.805 col No Crimp
Group= 2.0 inch circular

150gr Hornady Soft Point flat base.
41.5 gr Benchmark
LC-91 , BR-2
2.785 col, NO CRIMP
Group= 0.90 inch average. (smallest group was 0.60 inch)

110 grain Hornady Spire soft point
47.0 grains Benchmark
Privi Brass , BR-2
2.690 col , light 1/4 turn roll crimp
Group = 1.75 inches Actually cycles the action just fines. Going over 3,100 fps

M-118 Special Ball 172 grain boat-tail issue ammo. 1991 lake City
Group= 1.75 inches

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