Garands are limited by their gas system. Loads that produce too much port pressure will cause malfunctions and damage the rifle. As for bullets, the “best” overall bullet out to 300 yards has been the 168 SMK, at 500/600 yards I would use 175 SMK’s. The military match load was a 173/174 FMJBT but it was not a hot load:
My standard match load has been a 168 SMK with 47.0 grains IMR 4895 and a CCI #34 primer. I have run 175 SMK’s with that powder charge but I consider it a maximum in this mechanism.
A 175 grain bullet is as high as you should go with 308 Win’s in Garands. It is possible to try higher bullets with gas port disabling devices, I tried 190’s one match at long range, heavier bullets shot poorly, the recoil was excessive, and was hard on the gun. Hard to explain that last one, but the whole recoil experience seemed hard on the rifle.
I ran a primer test in 2011. I had purchased Wolf and Tula7.62 primers. Tula 7.62 were advertized to be the same insensitivity as CCI #34’s, which are a mil spec primer. Mil spec primers are less sensitive than commercial primers, due to a combination of a thick cup, different primer mix, and other factors. They exist because military weapons often have heavy free floating firing pins. Heavy free floating firing pins have a tendency to ignite sensitive primers before the trigger is pulled. An accidental discharge will range from embarrassing to fatal accident.
My load is a standard match load in the Garand. Garands are not magnums and the loads they fire are in today’s world, mild. Heavier loads, powders like IMR 4350, will over accelerate parts in the Garands leading to malfunctions and long term will damage parts.
What I saw in my test, holding case, bullet, powder the same, was that velocities and group sizes change with change of primer.
My old standby of the nickel plated WLR and CCI #34’s shot very well, the Wolf and Tula primers also shot very well. I was disappointed in the groups with Federal primers.
Because of their sensitivity, I do not recommend Federal primers in Garands. Federals are the most sensitive primer on the market and the most slamfiring primer ever in Garands/M1a’s.
Code:
[SIZE="3"]M1 Garand BMR Receiver Douglas Barrel 1:10 twist
150 gr FMJBT 1966 Ball
14 Nov 2011 T= 74 ° F
Ave Vel = 2545
Std Dev = 20
ES = 68
Low = 2513
High = 2581
N= 8
174 FMJBT White Box 1968 NM M72, Headstamp LC67 match, box velocity 2640 fps
14 Nov 2011 T = 74 °F
Ave Vel = 2592
Std Dev = 28
ES = 103
High = 2647
Low = 2544
N = 10
174 FMJBT 47.0 IMR 4895 Lot L7889 thrown LC62NM CCI #34 OAL 3.30
14 Nov 2011 T = 74 °F
Ave Vel = 2632
Std Dev = 20
ES = 60
High = 2671
Low = 2611
N = 10
174 FMJBT 47.0 IMR 4895 Lot L7889 thrown LC62NM Tula 7.62 lot 1-10 primers OAL 3.30
14 Nov 2011 T = 74 °F
Ave Vel = 2582
Std Dev = 15
ES = 49
High = 2602
Low = 2553
N = 10
excellent group
174 FMJBT 47.0 IMR 4895 Lot L7889 thrown LC62NM Wolf NCLR lot 18-09 OAL 3.30
14 Nov 2011 T = 74 °F
Ave Vel = 2607
Std Dev = 17
ES = 57
High = 2642
Low = 2585
N = 10
174 FMJBT 47.0 IMR 4895 Lot L7889 thrown LC62NM WLR (Nickle) OAL 3.30
14 Nov 2011 T = 74 °F
Ave Vel = 2650
Std Dev = 19
ES = 68
High = 2688
Low = 2620
N = 10
Very good group
174 FMJBT 47.0 IMR 4895 Lot L7889 thrown LC62NM CCI200 OAL 3.30
14 Nov 2011 T = 74 °F
Ave Vel = 2599
Std Dev = 22
ES = 75
High = 2637
Low = 2562
N = 10
Very good group [/SIZE]
100 yard reduced course match targets with Tula and CCI #34 primers