03-27-2011, 04:11 PM
Here is some chrono data for Accurate 2520/Hornady 123 AMax vs Alexander Arms/123 Lapua factory loads.
Note I was using only 30 grains of 2520, the max is 30.5. I have since shot 30.5 with AMax 123's with good accuracy and no pressure signs. I haven't chrono'd them yet, but there was distinctly more recoil. I also have some Hornady factory 123 loads I need to chrono for comparison. I post that data as soon as I can get to the range to collect it. I also plan to chrono at 100 yards to see the velocity drop at that range. I'm trying to tighten up my reloading practices to get my standard deviation down as much as possible.
Note this is a 20 inch barrel. Most of the published data you see is for 24 inch bbl.
Brass: Hornady 6.5 Grendel (new)
Bullet: Hornady 123 Amax
Powder: 30 grains, Accurate Arms 2520
Primers: CCI 450, Small Rifle
Muzzle velocities in feet per second:
All Shots Included 2478 (shot #14) Removed
1: 2539 2539
2: 2534 2534
3: 2520 2520
4: 2549 2549
5: 2539 2539
6: 2506 2506
7: 2530 2530
8: 2534 2534
9: 2525 2525
10: 2554 2554
11: 2539 2539
12: 2525 2525
13: 2520 2520
14: 2478 2515
15: 2515 2549
16: 2549 2525
17: 2525 2530
18: 2530 2549
19: 2549 2534
20: 2534 2549
21: 2549 2534
22: 2534 2539
23: 2539 2534
24: 2534 2530
25: 2530
Hi: 2554 2554
Lo: 2478 2506
Ave: 2531 2533
Extreme Spread: 76 48
Std. Dev: 16 12
---------------------------------------------------------------------------
Alexander Arms 123 grain Factory Load
Brass: Lapua 6.5 Grendel (AA head stamp)
Bullet: 123 grain Lapua Scenar
Powder: 30.8 grains, AA Factory Load Powder
Primers: ?, suspect CCI 450, Small Rifle
Muzzle velocities in feet per second:
All Shots Included 2515 (shot #11) Removed
1: 2487 2487
2: 2487 2487
3: 2473 2473
4: 2469 2469
5: 2496 2496
6: 2492 2492
7: 2478 2478
8: 2460 2460
9: 2496 2496
10: 2487 2487
11: 2515 2473
12: 2473 2482
13: 2482 2501
14: 2501 2473
15: 2473 2478
16: 2478 2482
17: 2482 2487
18: 2487 2501
19: 2501 2501
20: 2501
Hi: 2515 2501
Lo: 2460 2460
Ave: 2485 2484
Extreme Spread: 55 41
Std. Dev: 13 12
Note I was using only 30 grains of 2520, the max is 30.5. I have since shot 30.5 with AMax 123's with good accuracy and no pressure signs. I haven't chrono'd them yet, but there was distinctly more recoil. I also have some Hornady factory 123 loads I need to chrono for comparison. I post that data as soon as I can get to the range to collect it. I also plan to chrono at 100 yards to see the velocity drop at that range. I'm trying to tighten up my reloading practices to get my standard deviation down as much as possible.
Note this is a 20 inch barrel. Most of the published data you see is for 24 inch bbl.
Brass: Hornady 6.5 Grendel (new)
Bullet: Hornady 123 Amax
Powder: 30 grains, Accurate Arms 2520
Primers: CCI 450, Small Rifle
Muzzle velocities in feet per second:
All Shots Included 2478 (shot #14) Removed
1: 2539 2539
2: 2534 2534
3: 2520 2520
4: 2549 2549
5: 2539 2539
6: 2506 2506
7: 2530 2530
8: 2534 2534
9: 2525 2525
10: 2554 2554
11: 2539 2539
12: 2525 2525
13: 2520 2520
14: 2478 2515
15: 2515 2549
16: 2549 2525
17: 2525 2530
18: 2530 2549
19: 2549 2534
20: 2534 2549
21: 2549 2534
22: 2534 2539
23: 2539 2534
24: 2534 2530
25: 2530
Hi: 2554 2554
Lo: 2478 2506
Ave: 2531 2533
Extreme Spread: 76 48
Std. Dev: 16 12
---------------------------------------------------------------------------
Alexander Arms 123 grain Factory Load
Brass: Lapua 6.5 Grendel (AA head stamp)
Bullet: 123 grain Lapua Scenar
Powder: 30.8 grains, AA Factory Load Powder
Primers: ?, suspect CCI 450, Small Rifle
Muzzle velocities in feet per second:
All Shots Included 2515 (shot #11) Removed
1: 2487 2487
2: 2487 2487
3: 2473 2473
4: 2469 2469
5: 2496 2496
6: 2492 2492
7: 2478 2478
8: 2460 2460
9: 2496 2496
10: 2487 2487
11: 2515 2473
12: 2473 2482
13: 2482 2501
14: 2501 2473
15: 2473 2478
16: 2478 2482
17: 2482 2487
18: 2487 2501
19: 2501 2501
20: 2501
Hi: 2515 2501
Lo: 2460 2460
Ave: 2485 2484
Extreme Spread: 55 41
Std. Dev: 13 12