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H414 powder
- Thread starter AL PALMER
- Start date
Dunno how much this will help but one load I have for the .308 was worked up in 90 to 100+ degree temps with W760. H414 and W760 are just different lots of the same powder. The deer hunt I did was in there upper 40's at best and I had not problem taking my deer at 250 yards.
Two years ago I worked up a load with the 165 gr. Nobler Accubond and did an elk hunt that was 6 above at the start and about 15 above when I shot my elk. It was about 20 to 25 degrees the day before when my partner and I checked out our sights at the NRA's Whittington Center and my 06 was spot on at 250 yards with no change in groups.
Some people have noted velocity changes with H414/W760 butI've used that powder since the mid 1970's and have never noticed any difference. Guess you'll just have to try it at both temperature levels and see how it works in you rifle. As for me, I've not had a problem.
Paul B.
Two years ago I worked up a load with the 165 gr. Nobler Accubond and did an elk hunt that was 6 above at the start and about 15 above when I shot my elk. It was about 20 to 25 degrees the day before when my partner and I checked out our sights at the NRA's Whittington Center and my 06 was spot on at 250 yards with no change in groups.
Some people have noted velocity changes with H414/W760 butI've used that powder since the mid 1970's and have never noticed any difference. Guess you'll just have to try it at both temperature levels and see how it works in you rifle. As for me, I've not had a problem.
Paul B.
We can't answer your question because we don't know you cartridge and load, and those things DO matter. The more "overbore" the cartridge the more you'll see temp sensitivity, the less overbore the less you'll see it. For example the same charge of H414 in 243 Win pushing a 6mm bullet will show a lot more variation than a 338 Federal pushing a 338 cal bullet. Same charge weight, but different change in FPS because different bullets and bore volumes.
But, for a 308 Win or 30-06 in the normal hunting bullet weight range, assume one fps for one degree F for all St. Marks older ball powder formulations (newer ones have better temp stability, often between 0.5 and 1.0 fps per degree F). So between 55 and 80 degrees you should see 25 fps additional velocity.
Still, between 55 and 80 degrees, generally that won't even be a sight adjustment at normal hunting ranges. If you are shooting Service Rifle though, the rule of thumb is an extra click of adjustment per 10 degrees F with a temp sensitive powder like Reloader15 in M118LR.
Hope this is helpful, even if it doesn't answer your question.
Jimro
But, for a 308 Win or 30-06 in the normal hunting bullet weight range, assume one fps for one degree F for all St. Marks older ball powder formulations (newer ones have better temp stability, often between 0.5 and 1.0 fps per degree F). So between 55 and 80 degrees you should see 25 fps additional velocity.
Still, between 55 and 80 degrees, generally that won't even be a sight adjustment at normal hunting ranges. If you are shooting Service Rifle though, the rule of thumb is an extra click of adjustment per 10 degrees F with a temp sensitive powder like Reloader15 in M118LR.
Hope this is helpful, even if it doesn't answer your question.
Jimro
I would estimate 1.25 to 1.33 fps per degree F in a 243 Win pushing a 70gr bullet between 55 and 80 degrees, with pressure change to match. Not enough to ruin a hunt for big game, maybe enough to throw you off a small varmint.
That is just my opinion, based on my experience with similar ball powders, so don't take it as any sort of gospel.
Jimro
That is just my opinion, based on my experience with similar ball powders, so don't take it as any sort of gospel.
Jimro
I used h414 exclusively in my 260 Tikka and started loading it in 40 degree weather and impact at 98 degree was maybe 1/4 to 1/2 inch difference in poi. I don't know about your caliber and if the 100 yards I was shooting at are of any help. I changed over to h4831sc for the Hornady eld match when I started shooting out to 500 with it and temps were averaging in the 80's and never changed. Haven't been back with it as I quit shooting the 260 and went back to 308.