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Increased FPS

DLT

Silver $$ Contributor
So Thanksgiving day I ran a ladder at 300 yards with a used 6br barrel I was given but still shot fine. Working up from 30.0 to 30.8gr of varget with the 95smk. The rifle shot well at 30.0 and 30.2 with 30.4 opening up slightly. The velocities for my 30.2 group was 2856, 2864, 2870. After I fired all my brass I did not anneal or tumble the cases like I normally do, I simply brushed the inside necks and ran through full length sizer before throwing powder and seating my bullets. Today on the range the load I had chose excelled in both s.d. and shooting flat. My speeds was well into 2890’s why would that have been ? It was cooler today than Thursday when I tested . I also used the same lot of powder, primers and bullets. Could not annealing and tumbling cause what I experienced ? Thanks

EDIT\\\. I also did not anneal or tumble the brass prior to testing at 300 either
 
Last edited:
DLT said:
So Thanksgiving day I ran a ladder at 300 yards with a used 6br barrel I was given but still shot fine. Working up from 30.0 to 30.8gr of varget with the 95smk. The rifle shot well at 30.0 and 30.2 with 30.4 opening up slightly. The velocities for my 30.2 group was 2856, 2864, 2870. After I fired all my brass I did not anneal or tumble the cases like I normally do, I simply brushed the inside necks and ran through full length sizer before throwing powder and searing my bullets. Today on the range the load I had chose excelled in both s.d. and shooting flat. My speeds was well into 2890’s why would that have been ? It was cooler today than Thursday when I tested . I also used the same lot of powder, primers and bullets. Could not annealing and tumbling cause what I experienced ? Thanks

EDIT\\\. I also did not anneal or tumble the brass prior to testing.
Click to expand...

SEARED bullets always fly faster. LOL. Darned auto correct.
 
Lance21 said:
Had the brass been expanded before the initial test? If so and you didn't expand the 2nd time through, your neck tension could be higher, leading to more velocity, possibly....
Click to expand...
Yes I currently use a standard redding full length sizing die. Brass had 5 on it by time I tested the new bullet and 6 when I shot today.
 
FYI, my 6BR gains a bit of vel as the round count goes up. The longest I went before cleaning was 150 rounds. The vel increased by more than 50fps. Even over a 50 round string I adjust vertical hold as the fouling increases.
 
charlie b said:
FYI, my 6BR gains a bit of vel as the round count goes up. The longest I went before cleaning was 150 rounds. The vel increased by more than 50fps. Even over a 50 round string I adjust vertical hold as the fouling increases.
Click to expand...
Good information to have and pay attention to. Thank you. I’ll see how mine acts
 
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