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Range Report load testing.


Alaskapopo

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4-27-15 Load Testing from Nosler manual.
Firearm 24 inch Remginton 700 with 24 inch Obymeyer barrel.
Load 1.
Bullet: 178 Grain Hornady BTHP (seconds from Midway)
Case: New Lapua .308 brass trimmed and deburred inside and outside of case.
Powder: Varget 43.1 grains
Primer CCI Bench Rest 2
Accuracy .58 3 3 shot groups fired at 100 yards over a chrono.
Average velocity 2662 Spread 33 Standard Deviation 8

Load 2.
Bullet: 168 Grain Hornady AMAX (seconds from Midway)
Case: New Lapua .308 brass trimmed and deburred inside and outside of case.
Powder: Varget 44 grains
Primer CCI Bench Rest 2
Accuracy .52 3 3 shot groups fired at 100 yards over a chrono.
Average velocity 2723 Spread 67 Standard Deviation 23

Load 3.
Bullet: 175 Grain Sierra Match King
Case: New Lapua .308 brass trimmed and deburred inside and outside of case.
Powder: IMR 4895 39.5 grains
Primer CCI Bench Rest 2
Accuracy .28 3 3 shot groups fired at 100 yards over a chrono.
Average velocity 2469 Spread 51 Standard Deviation 14

Load 4.
Bullet: 168 Grain Sierra Match King
Case: New Lapua .308 brass trimmed and deburred inside and outside of case.
Powder: BLC2 46.3 grains
Primer CCI Bench Rest 2
Accuracy .70 3 3 shot groups fired at 100 yards over a chrono.
Average velocity 2769 Spread 33 Standard Deviation 11

Load 5.
Bullet: 155 Grain Sierra Parma Match King
Case: New Lapua .308 brass trimmed and deburred inside and outside of case.
Powder: VV N140
Primer CCI Bench Rest 2
Accuracy .70 3 3 shot groups fired at 100 yards over a chrono.
Average velocity 2698 Spread 36 Standard Deviation 11

FIREARM
AR10 build with 18 inch JP lightweight Barrel.
(the load with 4895 shot 1 3 shot group around 2.5 inches so I stopped testing on that load in this gun)
Load 1.
Bullet: 178 Grain Hornady BTHP (seconds from Midway)
Case: New Lapua .308 brass trimmed and deburred inside and outside of case.
Powder: Varget 43.1 grains
Primer CCI Bench Rest 2
Accuracy 1.0 3 3 shot groups fired at 100 yards over a chrono.
Average velocity 2498 Spread 50 Standard Deviation 16

Load 2.
Bullet: 168 Grain Hornady AMAX (seconds from Midway)
Case: New Lapua .308 brass trimmed and deburred inside and outside of case.
Powder: Varget 44 grains
Primer CCI Bench Rest 2
Accuracy 1.27 3 3 shot groups fired at 100 yards over a chrono.
Average velocity 2553 Spread 41 Standard Deviation 13

Load 3.
Bullet: 168 Grain Sierra Match King
Case: New Lapua .308 brass trimmed and deburred inside and outside of case.
Powder: Varget 44 grains
Primer CCI Bench Rest 2
Accuracy 1.08 2 3 shot groups fired at 100 yards over a chrono.
Average velocity 2620 Spread 15 Standard Deviation 10

Load 4.
Bullet: 168 Grain Sierra Match King
Case: New Lapua .308 brass trimmed and deburred inside and outside of case.
Powder: BLC2 46.3 grains
Primer CCI Bench Rest 2
Accuracy 1.53 3 3 shot groups fired at 100 yards over a chrono.
Average velocity 2581 Spread 71 Standard Deviation 24

Load 5.
Bullet: 155 Grain Sierra Parma Match King
Case: New Lapua .308 brass trimmed and deburred inside and outside of case.
Powder: VV N140
Primer CCI Bench Rest 2
Accuracy 1.20 3 3 shot groups fired at 100 yards over a chrono.
Average velocity 2550 Spread 52 Standard Deviation 19

4-27-15

Firearm Remginton 700 with 16 inch barrel

Load 1.
Bullet: 178 Grain Hornady BTHP (seconds from Midway)
Case: New Lapua .308 brass trimmed and deburred inside and outside of case.
Powder: Varget 43.1 grains
Primer CCI Bench Rest 2
Average velocity 2451

Load 2.
Bullet: 168 Grain Hornady AMAX (seconds from Midway)
Case: New Lapua .308 brass trimmed and deburred inside and outside of case.
Powder: Varget 44 grains
Primer CCI Bench Rest 2
Average velocity 2511

Load 3.
Bullet: 175 Grain Sierra Match King
Case: New Lapua .308 brass trimmed and deburred inside and outside of case.
Powder: IMR 4895 39.5 grains
Primer CCI Bench Rest 2
Accuracy .60 1 3 shot group and 1 5 shot group fired at 100 yards over a chrono.
Average velocity 2234 Spread 87 Standard Deviation 26

Load 4.
Bullet: 168 Grain Sierra Match King
Case: New Lapua .308 brass trimmed and deburred inside and outside of case.
Powder: BLC2 46.3 grains
Primer CCI Bench Rest 2
Average velocity 2561

Load 5.
Bullet: 155 Grain Sierra Parma Match King
Case: New Lapua .308 brass trimmed and deburred inside and outside of case.
Powder: VV N140
Primer CCI Bench Rest 2
Average velocity 2500

Load 6 (standard load for this gun)
Bullet: 168 Grain Sierra Match King
Case: New Lapua .308 brass trimmed and deburred inside and outside of case.
Powder: BLC2 46.3 grains
Primer CCI Bench Rest 2
Accuracy .74 5 3 shot groups fired at 100 yards
Also fired 2 3 shot groups at 175 yards avg of both groups .75
Average velocity 2558 Spread 70 Standard Deviation 18

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  • 4 months later...
  • 4 months later...

If load #1 fired MOA or less groups, it would be a better bet for Long Range shooting, over load 6, depending on the bullet's BC. I would kick out loads with an SD or 20 or more of those options (without even considering extreme spread).

Run the Dope charts for a bullet traveling 2600 fps and the same bullet traveling 2650fps and look at the 1,000 yard column. I took some generic figures and there was an almost 20" difference in point of impact. You might have a load that shoots sub MOA at 100, and out past 600 that has such an extreme spread in velocity or high SD that once you get out a ways they are less than satisfactory.

SD is using all the rounds in a string checked while ES is only using 2 rounds so your odds are better using SD for calculation of expected average performance verses ES which gives you more of a possible performance (possible, but not probable).

Just for fun, throw in the BC's when considering what you are going to use, because as you know, doping the wind is the real fight in this game.

Anyway, if 1 MOA is 10" at 1,000 yards and it is measured from the center of your aiming point you have a 5"+/- in any direction. If you have a 50fps difference in velocity at 1,000 yards that works out to 20" (10"+/- up or down) So you are doubling (statistician's feel free to correct this) your decrease in accuracy.

Sooo many things to consider, but just using the smallest group is not always the best indication of accuracy/performance at longer range.

wg

Edited by Wild Gene
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