I've worked up a load for my 20' Remington 5R with SMK 155 palmas. Velocity is 2740 with 46.8 grains of Varget. I was starting to see flat primers when I got around 47 grains. Is there another powder that might get me some more velocity out of this barrel? OR is that about as good as its going to get?
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Re: More Velocity out of .308 155s in 20' bbl?
You might try Vihtavuori 540.
You might try Vihtavuori 540.
Re: More Velocity out of .308 155s in 20' bbl?
H4895, RL-15, N-140, N-540, or maybe the new ball powder from Alliant.
Only way I see you gaining any velocity is to go to a double base powder, most probably in ball form. Personally, I try to stay away from double base but if you "must" have the velocity then double base powder is about the only option you have at this point.
Run the #s at JBM using Litz BC value for your 155s vs 190 SMK. I'm getting 2525 fps from a 20" AR, you'll probably see more along the lines of 2550 fps from a 20" bolt rifle.
H4895, RL-15, N-140, N-540, or maybe the new ball powder from Alliant.
Only way I see you gaining any velocity is to go to a double base powder, most probably in ball form. Personally, I try to stay away from double base but if you "must" have the velocity then double base powder is about the only option you have at this point.
Run the #s at JBM using Litz BC value for your 155s vs 190 SMK. I'm getting 2525 fps from a 20" AR, you'll probably see more along the lines of 2550 fps from a 20" bolt rifle.
Re: More Velocity out of .308 155s in 20' bbl?
This is a subject I've been working on also....I have a new APA bolt gun .308 w/18" Rock Creek tube. I was really concerned with velocity at first, and with flat primers and slight craters I got to 2825 fps average..( 155 scenars).....but groups were so so......I backed down to 46.2 gr of varget running 2765 fps, and am staying well under half MOA when I do my part.
I want to experiment with any other powders that might give me more speed, and good accuracy.....suggestions?
This is a subject I've been working on also....I have a new APA bolt gun .308 w/18" Rock Creek tube. I was really concerned with velocity at first, and with flat primers and slight craters I got to 2825 fps average..( 155 scenars).....but groups were so so......I backed down to 46.2 gr of varget running 2765 fps, and am staying well under half MOA when I do my part.
I want to experiment with any other powders that might give me more speed, and good accuracy.....suggestions?
Re: More Velocity out of .308 155s in 20' bbl?
I'm getting 2925-2950 from a 24" Remmy M40 VNC from 155 Scenars 47.8gr* Varget CCI primers in WIN cases loaded to 2.948OAL. With a 20" tube you should be able to get into the 2850 range.
I started to see flattened primers around 46.x-ish (also), but pushed forward to the "internet" recommended 47.8.
(*) Caution:: This is a very stiff load, right on the edge of sane pressures. However, having a set (100) of casees that has survived 30 reload cycles without loosing a primer pocket or neck, it can't be that bad. I have lost 4 cases to body crack and to incipient case head expansion (i/.e would crack in a bad way on the next shot).
The edge of the primer is more indicative than a cratered primer in Remmy's due to the sloppy firing pin hole in the bolt. Bushing this hole basically makes that issue vanish.
I'm getting 2925-2950 from a 24" Remmy M40 VNC from 155 Scenars 47.8gr* Varget CCI primers in WIN cases loaded to 2.948OAL. With a 20" tube you should be able to get into the 2850 range.
I started to see flattened primers around 46.x-ish (also), but pushed forward to the "internet" recommended 47.8.
(*) Caution:: This is a very stiff load, right on the edge of sane pressures. However, having a set (100) of casees that has survived 30 reload cycles without loosing a primer pocket or neck, it can't be that bad. I have lost 4 cases to body crack and to incipient case head expansion (i/.e would crack in a bad way on the next shot).
The edge of the primer is more indicative than a cratered primer in Remmy's due to the sloppy firing pin hole in the bolt. Bushing this hole basically makes that issue vanish.
Re: More Velocity out of .308 155s in 20' bbl?
Try some Alliant 2000mr. I couldn't get acceptable velocity or accuracy using Varget or R15 so I gave it a try. I push a 175 with 48 grains of 2000mr at 2650 with a 20" factory Rem barrel. No pressure signs at all and good accuracy all the way to 1k.
Try some Alliant 2000mr. I couldn't get acceptable velocity or accuracy using Varget or R15 so I gave it a try. I push a 175 with 48 grains of 2000mr at 2650 with a 20" factory Rem barrel. No pressure signs at all and good accuracy all the way to 1k.
Re: More Velocity out of .308 155s in 20' bbl?
What case are you using? I got slow numbers from my 19" tube with Lapua brass. I switched to Winchester due to the increased case capacity and got 2900+ from it easy.
What case are you using? I got slow numbers from my 19" tube with Lapua brass. I switched to Winchester due to the increased case capacity and got 2900+ from it easy.
Re: More Velocity out of .308 155s in 20' bbl?
2000MR should give you between 70-100 extra fps. I'm not sure about a charge weight for 155s but I can tell you that I've loaded up to 47 grains of it in LC brass with a 175 in my semi.
2000MR should give you between 70-100 extra fps. I'm not sure about a charge weight for 155s but I can tell you that I've loaded up to 47 grains of it in LC brass with a 175 in my semi.
Re: More Velocity out of .308 155s in 20' bbl?
I have a tactical w/ the 20" barrel and that is about what I get too, 2840, but with scenars and A-Max. Moved over to 175 smk's @ 2550, 168 vlds for hunting @ 2610 in that gun and havn't looked back.
I have a tactical w/ the 20" barrel and that is about what I get too, 2840, but with scenars and A-Max. Moved over to 175 smk's @ 2550, 168 vlds for hunting @ 2610 in that gun and havn't looked back.
Re: More Velocity out of .308 155s in 20' bbl?
Work up a load with 8208xbr or h4895. 2890 out of my 20" Rock Barrel With 46.1 8208, Tula 7.62 primers, Winchester brass, and Sierra 2156 Palma bullets taking a pretty large leap to the lands. Excellent accuracy to 1k, which is the furthest I've shot it.
In my tight bore Bartlein, at 24", I am at 2900 with 45.4 8208.
Work up a load with 8208xbr or h4895. 2890 out of my 20" Rock Barrel With 46.1 8208, Tula 7.62 primers, Winchester brass, and Sierra 2156 Palma bullets taking a pretty large leap to the lands. Excellent accuracy to 1k, which is the furthest I've shot it.
In my tight bore Bartlein, at 24", I am at 2900 with 45.4 8208.
Re: More Velocity out of .308 155s in 20' bbl?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JPipes</div><div class="ubbcode-body">
In my tight bore Bartlein, at 24", I am at 2900 with 45.4 8208.
</div></div>
Push the envelope Pipes and get that pill closer to 3k!
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JPipes</div><div class="ubbcode-body">
In my tight bore Bartlein, at 24", I am at 2900 with 45.4 8208.
</div></div>
Push the envelope Pipes and get that pill closer to 3k!
Re: More Velocity out of .308 155s in 20' bbl?
H4895 or 8208 XBR. For pure velocity, the H4895 has worked better for me.
H4895 or 8208 XBR. For pure velocity, the H4895 has worked better for me.
Re: More Velocity out of .308 155s in 20' bbl?
Just what I was looking for,Thanks
Just what I was looking for,Thanks
Re: More Velocity out of .308 155s in 20' bbl?
I'm running Winchester brass. What charges are you guys running with the 4895? I've been using 2.80 oal.
I'm running Winchester brass. What charges are you guys running with the 4895? I've been using 2.80 oal.
Re: More Velocity out of .308 155s in 20' bbl?
This might also help in your experiments. http://www.reloadbench.com/burn.html
I have'nt used many of the listed powders in reply but on a 20" .308, RL-15 should add significant fps. I would agree with FCS's reply in limitation of what I have used.
This might also help in your experiments. http://www.reloadbench.com/burn.html
I have'nt used many of the listed powders in reply but on a 20" .308, RL-15 should add significant fps. I would agree with FCS's reply in limitation of what I have used.
Re: More Velocity out of .308 155s in 20' bbl?
I did a lot of experimenting with 155s and 2000MR. I am currently pushing a 175smk @ 2780 and have 0 pressure signs. I was disappointed that I couldn't get any acceptable results out of the 155s as I was hoping to get close to 3k fps. Best group I could get was right in the 1 in neighborhood. I have heard from some guys that 2000MR does best with heavier bullets but other have had success. Its definitely worth a try. I love that powder. It takes up considerably less case capacity than varget as well. Good luck.
I did a lot of experimenting with 155s and 2000MR. I am currently pushing a 175smk @ 2780 and have 0 pressure signs. I was disappointed that I couldn't get any acceptable results out of the 155s as I was hoping to get close to 3k fps. Best group I could get was right in the 1 in neighborhood. I have heard from some guys that 2000MR does best with heavier bullets but other have had success. Its definitely worth a try. I love that powder. It takes up considerably less case capacity than varget as well. Good luck.
Re: More Velocity out of .308 155s in 20' bbl?
Yeah I was going to add that 2000MR + 175s is a better way to go. You should be able to get 2650 out of your 20". Hell I got almost 2550 out of a 16"...
Yeah I was going to add that 2000MR + 175s is a better way to go. You should be able to get 2650 out of your 20". Hell I got almost 2550 out of a 16"...
Re: More Velocity out of .308 155s in 20' bbl?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 350 Kid</div><div class="ubbcode-body">h4895 gives me just under 3000 fps out of 2 different 20 inch barreled 308's with 150 grain nosler partition, hornady spitzer,nosler ballistic tip. </div></div>
Good to know. That's going to be my hunting bullet.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 350 Kid</div><div class="ubbcode-body">h4895 gives me just under 3000 fps out of 2 different 20 inch barreled 308's with 150 grain nosler partition, hornady spitzer,nosler ballistic tip. </div></div>
Good to know. That's going to be my hunting bullet.
Re: More Velocity out of .308 155s in 20' bbl?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BCP</div><div class="ubbcode-body">Yeah I was going to add that 2000MR + 175s is a better way to go. You should be able to get 2650 out of your 20". Hell I got almost 2550 out of a 16"... </div></div>
thats crazy! I love this powder. I am guessing I can get somewhere around 2840fps from my 24" bbl before I hit pressure issues. Weather I can find as good of an accuracy node there is yet to be determined. But, from what work I have done with 2000MR so far the harder you push it the tighter the groups. From what I have heard it is pretty temp stable also. Anyone have any data on that from their own experience?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BCP</div><div class="ubbcode-body">Yeah I was going to add that 2000MR + 175s is a better way to go. You should be able to get 2650 out of your 20". Hell I got almost 2550 out of a 16"... </div></div>
thats crazy! I love this powder. I am guessing I can get somewhere around 2840fps from my 24" bbl before I hit pressure issues. Weather I can find as good of an accuracy node there is yet to be determined. But, from what work I have done with 2000MR so far the harder you push it the tighter the groups. From what I have heard it is pretty temp stable also. Anyone have any data on that from their own experience?
Re: More Velocity out of .308 155s in 20' bbl?
IMR 3031
Win Cases
Lapua 155's
FGMM primers
2.84aol
43-43.3grains will get you between 2840-2880fps (This is a published max load but I have no pressures signs in all the rifles i've tried it in
I used this load in several different rifles w/ factory and custom barrels 20-22" long. Speeds were consistent and accurate across all weapons
IMR 3031
Win Cases
Lapua 155's
FGMM primers
2.84aol
43-43.3grains will get you between 2840-2880fps (This is a published max load but I have no pressures signs in all the rifles i've tried it in
I used this load in several different rifles w/ factory and custom barrels 20-22" long. Speeds were consistent and accurate across all weapons
Re: More Velocity out of .308 155s in 20' bbl?
currently I'm running 43grs even, 22" barrel and getting 2840fps and it seem easy on the brass and the gun.
currently I'm running 43grs even, 22" barrel and getting 2840fps and it seem easy on the brass and the gun.
Re: More Velocity out of .308 155s in 20' bbl?
Try XBR but be very cautious working it up,.3 gr. increments at the most!!I was getting in the mid 2700 area with varget out of an AI AE on second fired brass,worked up a load with XBR and it go me in the 2,900's and was very accurate and temp. stable.
Try XBR but be very cautious working it up,.3 gr. increments at the most!!I was getting in the mid 2700 area with varget out of an AI AE on second fired brass,worked up a load with XBR and it go me in the 2,900's and was very accurate and temp. stable.
Re: More Velocity out of .308 155s in 20' bbl?
Just some info aboout 175gr
http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=2653377#Post2653377
Just some info aboout 175gr
http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=2653377#Post2653377
Re: More Velocity out of .308 155s in 20' bbl?
Be careful when trying <span style="color: #FF0000"><span style="font-weight: bold">HOT</span></span> loads used by other shooters. Every rifle reaches maximum chamber pressure differently. Two of my (3) different Rem700s (all .308 Win.) reach maximum pressure with 44.5 gr. Varget and 175 gr. Sierra HPBT. Average velocity is 2690 fps.
The other rifle reaches <span style="text-decoration: underline">absolute maximum</span> pressure at 43.5 gr. Varget. Average velocity is 2620 fps with 175 Sierra HPBT. I have also found very noticable variation in pressure when switching to different lots of Varget.
It's better to put a few extra clicks on your scope then to damage your rifle - or injure yourself.
Be careful when trying <span style="color: #FF0000"><span style="font-weight: bold">HOT</span></span> loads used by other shooters. Every rifle reaches maximum chamber pressure differently. Two of my (3) different Rem700s (all .308 Win.) reach maximum pressure with 44.5 gr. Varget and 175 gr. Sierra HPBT. Average velocity is 2690 fps.
The other rifle reaches <span style="text-decoration: underline">absolute maximum</span> pressure at 43.5 gr. Varget. Average velocity is 2620 fps with 175 Sierra HPBT. I have also found very noticable variation in pressure when switching to different lots of Varget.
It's better to put a few extra clicks on your scope then to damage your rifle - or injure yourself.
