C
chino69
Guest
Has anyone used Norma 203 B powder in a 6mm BR with 105+ bullets?
Chino69
Chino69
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Y
-Yo-
Guest
Yep, I've tried it, but the lot was produced some years ago. Here's my take based on testing with 6BR and 105gr Lapua Scenars. It's accurate, meters better than Varget, shows low ES/SD, but it is more temp sensitive than some other powders.
Accuracy: As good or better than any powder tested--including Varget.
Velocity:
Norma 203B 30.3 grains
OAL 2.346
Into lands +0.011
Average 2901 FPS (2900, 2898, 2905, 2903)
Extreme Spread 7.0 FPS
Std Dev 3.1 FPS
NOTE: After above test, ammo was deliberately left in sun for 10 minutes in 80 deg weather. After 10 minutes in sun, Average increased to 2917 FPS.
Comparison: In my rifle, 30.3 grains of Varget chron'd 2907 FPS with ES of 12 and SD of 5 (for 5 shots). So, the 203B produced VERY similar velocities.
Easy to Tune: One thing I noted was that ALL my test loads, from 2850 fps to 2950 fps, were very accurate. Big Accuracy window with this powder. Load of 30.5, .020" into lands put three shots into one ragged hole at 100 yards.
Accuracy: As good or better than any powder tested--including Varget.
Velocity:
Norma 203B 30.3 grains
OAL 2.346
Into lands +0.011
Average 2901 FPS (2900, 2898, 2905, 2903)
Extreme Spread 7.0 FPS
Std Dev 3.1 FPS
NOTE: After above test, ammo was deliberately left in sun for 10 minutes in 80 deg weather. After 10 minutes in sun, Average increased to 2917 FPS.
Comparison: In my rifle, 30.3 grains of Varget chron'd 2907 FPS with ES of 12 and SD of 5 (for 5 shots). So, the 203B produced VERY similar velocities.
Easy to Tune: One thing I noted was that ALL my test loads, from 2850 fps to 2950 fps, were very accurate. Big Accuracy window with this powder. Load of 30.5, .020" into lands put three shots into one ragged hole at 100 yards.
C
chino69
Guest
Norma 203 B
Thank you; that's what I was looking for. I just bought 3 lbs. from Powder Valley who just received some in. Did you use CCI 450 mag primers or regular primers?
Chino69
Yep, I've tried it, but the lot was produced some years ago. Here's my take based on testing with 6BR and 105gr Lapua Scenars. It's accurate, meters better than Varget, shows low ES/SD, but it is more temp sensitive than some other powders.
Accuracy: As good or better than any powder tested--including Varget.
Velocity:
Norma 203B 30.3 grains
OAL 2.346
Into lands +0.011
Average 2901 FPS (2900, 2898, 2905, 2903)
Extreme Spread 7.0 FPS
Std Dev 3.1 FPS
NOTE: After above test, ammo was deliberately left in sun for 10 minutes in 80 deg weather. After 10 minutes in sun, Average increased to 2917 FPS.
Comparison: In my rifle, 30.3 grains of Varget chron'd 2907 FPS with ES of 12 and SD of 5 (for 5 shots). So, the 203B produced VERY similar velocities.
Easy to Tune: One thing I noted was that ALL my test loads, from 2850 fps to 2950 fps, were very accurate. Big Accuracy window with this powder. Load of 30.5, .020" into lands put three shots into one ragged hole at 100 yards.
Thank you; that's what I was looking for. I just bought 3 lbs. from Powder Valley who just received some in. Did you use CCI 450 mag primers or regular primers?
Chino69
Last edited by a moderator:
Y
-Yo-
Guest
Primers were CCI small rifle standard, the 400 series, not 450 sm rifle magnum.
In my rifle it was a very close call between Varget and Norma 203B. IMR 4895 also shot well.
I do think the 203B cleaned up easier. It didn't leave that greenish-brown glaze that Varget leaves. Definitely easier to meter.
In my rifle it was a very close call between Varget and Norma 203B. IMR 4895 also shot well.
I do think the 203B cleaned up easier. It didn't leave that greenish-brown glaze that Varget leaves. Definitely easier to meter.
C
chino69
Guest
Primers were CCI small rifle standard, the 400 series, not 450 sm rifle magnum.
In my rifle it was a very close call between Varget and Norma 203B. IMR 4895 also shot well.
I do think the 203B cleaned up easier. It didn't leave that greenish-brown glaze that Varget leaves. Definitely easier to meter.
Thank you.
What was your load for IMR 4895?
Chino69