Two TRG22's: First is a fixed stock, 26" barrel, Near brake and about 2000 rounds. Second is a folder with 20" barrel, no brake and about 150 rounds.
Load consists of new Lapua brass with no prep other than mouth chamfer in a Giraud trimmer.
175 SMK seated with Redding comp, don't currently have notes for ogive measurement but OAL was 2.800 to 2.810 depending on bullet tip.
44.0 gr Varget (Chargmaster)
GM210M Primer
100 yd accuracy is very similar for both rifles with the most significant variation being the shooter. If shooter does his part this load easily shoots 0.5 moa in both rifles. Also shot both rifles from 200 to 600 yds on steel, wasn't really shooting for groups on steel but similar results for both rifles.
Collected a little velocity data and was a bit surprised that the same load in both rifles had significantly different ES and SD.
26" Barrel
2693
2686
2697
2689
2696
AVG: 2692
ES: 11
SD: 4.7
20" Barrel
2642
2595
2629
2615
2603
AVG: 2617
ES: 47
SD: 19.1
Both sets of velocity data were collected on same chrono within an hour of each other. I realize the sample size for each is small so definitely less than perfect data but it's interesting that the trends are so different. Anyone had similar results with 20" .308? Is there a better powder choice than Varget for relatively short barrel .308? Any ideas what may be causing the velocity variation in the 20"?
Load consists of new Lapua brass with no prep other than mouth chamfer in a Giraud trimmer.
175 SMK seated with Redding comp, don't currently have notes for ogive measurement but OAL was 2.800 to 2.810 depending on bullet tip.
44.0 gr Varget (Chargmaster)
GM210M Primer
100 yd accuracy is very similar for both rifles with the most significant variation being the shooter. If shooter does his part this load easily shoots 0.5 moa in both rifles. Also shot both rifles from 200 to 600 yds on steel, wasn't really shooting for groups on steel but similar results for both rifles.
Collected a little velocity data and was a bit surprised that the same load in both rifles had significantly different ES and SD.
26" Barrel
2693
2686
2697
2689
2696
AVG: 2692
ES: 11
SD: 4.7
20" Barrel
2642
2595
2629
2615
2603
AVG: 2617
ES: 47
SD: 19.1
Both sets of velocity data were collected on same chrono within an hour of each other. I realize the sample size for each is small so definitely less than perfect data but it's interesting that the trends are so different. Anyone had similar results with 20" .308? Is there a better powder choice than Varget for relatively short barrel .308? Any ideas what may be causing the velocity variation in the 20"?