40 gr IMR 4064
163 gr AP bullet
once fired Fed GMM brass
Fed GMM large rifle primers
OAL between 2.780 and 2.815
- These are loaded on a Dillon 650 and I can't seem to get a very consistent seating depth.
Test fired in AR-10 16" carbine (.308).
I set the chrono about 3 feet from the bench and got these results:
2425,2446,2421,2425,2407,2425,2528,2486,2481,2479,2447,2442,2485,2433,2453,2494,2516,2396
mean: 2455.11
std dev: 37.54
max: 2528
min: 2396
Excel Spreadsheet with Chrono Results
Accuracy was terrible! At 25 yards I was getting 1" groups and they just continued to open up beyond that. 50 yards = 2". 100 yards = 3" or more.
In the spreadsheet that is linked above, I included another set of chrono numbers for some 147 gr Radway Green. I can almost squeeze a 1" group out of this stuff in the same rifle. I was really hoping my handloads would do at least as well as the surplus.
Any suggestions on how to get some better groups? Change the seating depth; increase the powder charge...? By the way, given the numbers above, what do you think is a safe "maximum" velocity to push these 163's out of a 16" barrel?
163 gr AP bullet
once fired Fed GMM brass
Fed GMM large rifle primers
OAL between 2.780 and 2.815
- These are loaded on a Dillon 650 and I can't seem to get a very consistent seating depth.
Test fired in AR-10 16" carbine (.308).
I set the chrono about 3 feet from the bench and got these results:
2425,2446,2421,2425,2407,2425,2528,2486,2481,2479,2447,2442,2485,2433,2453,2494,2516,2396
mean: 2455.11
std dev: 37.54
max: 2528
min: 2396
Excel Spreadsheet with Chrono Results
Accuracy was terrible! At 25 yards I was getting 1" groups and they just continued to open up beyond that. 50 yards = 2". 100 yards = 3" or more.
In the spreadsheet that is linked above, I included another set of chrono numbers for some 147 gr Radway Green. I can almost squeeze a 1" group out of this stuff in the same rifle. I was really hoping my handloads would do at least as well as the surplus.
Any suggestions on how to get some better groups? Change the seating depth; increase the powder charge...? By the way, given the numbers above, what do you think is a safe "maximum" velocity to push these 163's out of a 16" barrel?