Hello guys and gals
I got new 30" benchmark barrel installed on my 308, got it throated long for heavy bullets. I load tested 215 hybrids(coated) in my 308 yesterday with H4350 and RL17, using Erick Cortina'a way. RL 17 was all over the target, played little bit with seating depth as well, ran out of formed cases but it didn't group at all, .7"-1" groups. The velocity was good, without any pressure signs I was getting 2600fps with 47.5 grains powder.
H4350 shot great at 46.5 grains , 0.3" groups consistent with almost one grain of accuracy window between 46-47 grains. But the velocity was 2495 fps. I was hoping to get 2550 minimum as I was running 208 amax at 2560 in 24" factory barrel. I ran out of case capacity, powder was compressed to the point that bullets were sticky coming out of seating die but no pressure signs whatsoever. Target with H4350 posted(I tried anyways)
Couple of questions I'm wondering about
First: what powder are you guys running with these heavy pills? I was thinking of trying different powder, slightly faster then H4350, N150 maybe?
Second: should I try naked bullets to increase pressure hence velocity? Or is increase going to be negligible?
Third: try different primer with RL 17 and see if I can make it work?
What do you experts suggest?
More info
Savage action 30" Benchmark , 1-9" twist
308 win, .300 land diameter (standard, not tight bore)
215 Berger hybrids - coated
Federal 210M primers
Lapua brass, internal capacity of 45.4 grains of water(with bullet seated)
COAL 3.064"
0 degree Celsius
80% humidity
89 kpa actual pressure
1100ish meters altitude
I got new 30" benchmark barrel installed on my 308, got it throated long for heavy bullets. I load tested 215 hybrids(coated) in my 308 yesterday with H4350 and RL17, using Erick Cortina'a way. RL 17 was all over the target, played little bit with seating depth as well, ran out of formed cases but it didn't group at all, .7"-1" groups. The velocity was good, without any pressure signs I was getting 2600fps with 47.5 grains powder.
H4350 shot great at 46.5 grains , 0.3" groups consistent with almost one grain of accuracy window between 46-47 grains. But the velocity was 2495 fps. I was hoping to get 2550 minimum as I was running 208 amax at 2560 in 24" factory barrel. I ran out of case capacity, powder was compressed to the point that bullets were sticky coming out of seating die but no pressure signs whatsoever. Target with H4350 posted(I tried anyways)
Couple of questions I'm wondering about
First: what powder are you guys running with these heavy pills? I was thinking of trying different powder, slightly faster then H4350, N150 maybe?
Second: should I try naked bullets to increase pressure hence velocity? Or is increase going to be negligible?
Third: try different primer with RL 17 and see if I can make it work?
What do you experts suggest?
More info
Savage action 30" Benchmark , 1-9" twist
308 win, .300 land diameter (standard, not tight bore)
215 Berger hybrids - coated
Federal 210M primers
Lapua brass, internal capacity of 45.4 grains of water(with bullet seated)
COAL 3.064"
0 degree Celsius
80% humidity
89 kpa actual pressure
1100ish meters altitude