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lugerstew · January 18, 2022, 11:56 AM

Went to the range yesterday and did two different loads for the brass test.
It kind of went the way I expected, with brass having less volume showing higher pressures/velocity.
I was shooting my Smith and Wesson M&P 10 308, 100 yds, 25 deg day, all brass was trimmed to same length with a CCI LR primer.

Test 1 Imr 4064 42.5g, coal=2.800 5 rounds each Nosler 168g CC HPBT
Hornady TAP 308 brass 191g=2595 avg. fps.,sd3
GFL 308 brass 191g=2605 avg. fps., sd10
PMC 308 brass 183g=2573 avg. fps., sd18
AP18 7.62x51 brass 181g=2545 avg fps.,sd23
PPU 308 brass 178g=2536 avg. fps., sd23

Test 2 Varget 43.5g, coal=2.800 10 rounds ea. Nosler 168g CC HPBT
Hornady TAP 308 brass 191g-2662 avg. fps., sd16
PMC 308 brass 183g=2622 avg. fps., sd11
AP18 7.62x51 brass 181g=2598 avg. fps sd12
WCC 308 brass 180g=2603 avg. fps sd8
MEN16 7.62x51 brass 180g=2594 avg. fps., sd23

I am loading some more to try in my Remington 700 308 bolt action and using bettery quality brass, because I don't like shooting good brass out of the AR due to the way it beats the brass up.

I was kind of surprised to see after weighing about 10 different brands of brass that 7.62x51 was not always heavier than 308 brass.

January 18, 2022, 11:56 AM	#1
lugerstew Senior Member Join Date: September 22, 2019 Location: Colorado Posts: 260	My brass test Went to the range yesterday and did two different loads for the brass test. It kind of went the way I expected, with brass having less volume showing higher pressures/velocity. I was shooting my Smith and Wesson M&P 10 308, 100 yds, 25 deg day, all brass was trimmed to same length with a CCI LR primer. Test 1 Imr 4064 42.5g, coal=2.800 5 rounds each Nosler 168g CC HPBT Hornady TAP 308 brass 191g=2595 avg. fps.,sd3 GFL 308 brass 191g=2605 avg. fps., sd10 PMC 308 brass 183g=2573 avg. fps., sd18 AP18 7.62x51 brass 181g=2545 avg fps.,sd23 PPU 308 brass 178g=2536 avg. fps., sd23 Test 2 Varget 43.5g, coal=2.800 10 rounds ea. Nosler 168g CC HPBT Hornady TAP 308 brass 191g-2662 avg. fps., sd16 PMC 308 brass 183g=2622 avg. fps., sd11 AP18 7.62x51 brass 181g=2598 avg. fps sd12 WCC 308 brass 180g=2603 avg. fps sd8 MEN16 7.62x51 brass 180g=2594 avg. fps., sd23 I am loading some more to try in my Remington 700 308 bolt action and using bettery quality brass, because I don't like shooting good brass out of the AR due to the way it beats the brass up. I was kind of surprised to see after weighing about 10 different brands of brass that 7.62x51 was not always heavier than 308 brass.