FitchHall
Member
THR,
I've been shooting for 12 years in the Marine Corps, but only recently have gotten serious about studying ballistics. After reading the outstanding book "Understanding Firearm Ballistics" by Robert Rinker, I found a very useful source of information and further study.
I have been able to shoot some outstanding 100 yard groups with my Remington 700 PSS in .308 and recently put these loads to the Chrono Test. The purpose of this post is to share some of these results and also ask more experienced shooters if these results are either typical or desirable.
Loading Equipment
RCBS RockChucker
Lee Neck-Sizing Die on once-fired brass in the test weapon
RCBS Seating Die
Lee Factory Crimp Die
Cartridge Data
Federal Match Brass once fired in the test weapon
Winchester Large Rifle Primers
Powder individually measured on a Lyman dispenser/scale combo.
Conditions:
Outdoors, 78degrees, 84 percent humidity.
Equipment
Shooting Chrony, shaded from direct sunlight with plenty of ambient light using the diffuser screens for a consistent photoreceptor backdrop.
OAL - 0.030 offset from the lands determined by using a Stoney Point OAL gauge.
Load 1 - Speer 168gr HPBT with 41.4gr of 4064 OAL 2.958
4 shots - 2438 / 2389 / 2452 / 2438
AVG - 2429.25 StDev - 27.633
Load 2 - Speer 168gr HPBT with 41.4 gr of AA 2520 OAL 2.958
4 shots - 2505 / 2527 / 2522 / 2527
AVG - 2520.25 StDev - 10.44
Load 3 - Hornady A-Max with 41.4gr of AA 2520 OAL 2.900
4 shots - 2591 / 2591 / 2584 / 2577
AVG - 2585.75 StDev - 6.70
During the test, Load 1 produced the best groups in spite of the largest StDev.
Comments or suggestions? Thank you for your time.
I've been shooting for 12 years in the Marine Corps, but only recently have gotten serious about studying ballistics. After reading the outstanding book "Understanding Firearm Ballistics" by Robert Rinker, I found a very useful source of information and further study.
I have been able to shoot some outstanding 100 yard groups with my Remington 700 PSS in .308 and recently put these loads to the Chrono Test. The purpose of this post is to share some of these results and also ask more experienced shooters if these results are either typical or desirable.
Loading Equipment
RCBS RockChucker
Lee Neck-Sizing Die on once-fired brass in the test weapon
RCBS Seating Die
Lee Factory Crimp Die
Cartridge Data
Federal Match Brass once fired in the test weapon
Winchester Large Rifle Primers
Powder individually measured on a Lyman dispenser/scale combo.
Conditions:
Outdoors, 78degrees, 84 percent humidity.
Equipment
Shooting Chrony, shaded from direct sunlight with plenty of ambient light using the diffuser screens for a consistent photoreceptor backdrop.
OAL - 0.030 offset from the lands determined by using a Stoney Point OAL gauge.
Load 1 - Speer 168gr HPBT with 41.4gr of 4064 OAL 2.958
4 shots - 2438 / 2389 / 2452 / 2438
AVG - 2429.25 StDev - 27.633
Load 2 - Speer 168gr HPBT with 41.4 gr of AA 2520 OAL 2.958
4 shots - 2505 / 2527 / 2522 / 2527
AVG - 2520.25 StDev - 10.44
Load 3 - Hornady A-Max with 41.4gr of AA 2520 OAL 2.900
4 shots - 2591 / 2591 / 2584 / 2577
AVG - 2585.75 StDev - 6.70
During the test, Load 1 produced the best groups in spite of the largest StDev.
Comments or suggestions? Thank you for your time.
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