is IMR 4895 one of those powders that would benifit from magnum primers? i bought a bottle of it by mistake ( i needed H 4895 for reduced loads) so i will have to use this up. when i shot several rounds from my 45-70 the other day, i noticed quite a bit of unburnt powder laying in the barrel. so i am thinking that maybe a magnum primer may help light all of this. these are not reduced loads. but i have not gotten to the top of the charge scale either. i will also be using this powder in my 300 win mag, but i have not shot any in that yet.
Imr 4895
- Thread starter x_wrench
- Start date
- Status
Clark
Member
No.
ArchAngelCD
Member.
Magnum primers are not needed or probably won't help. The case is so large for the 45-70 you are having powder position problems. Either try to be sure the powder is back against the primer before you fire or use a filler in the case. (Farina works well)
No, the unburned powder rains occur since the pressure in 45-70 is too low for a clean burn of IMR-4895. Try a faster burning powder. I use UNIQUE in light loads with lead bullets - ca 950 fps. In any case the unburned powder grains should not have a detrimental effect on accuracy. Alliant 2400 and SR-4759 produce excellent results in 45-70 but leave unburned powder grains ion the barrel.
You didn't specify what action you were using so here's the caveat.....
Too slow for a trapdoor action unless you are using heavy (500+ gr.) bullets. Even then it is a bit too slow.
For levers and stronger, think near full to compressed loads at any bullet weight. You will see in some cases where the 4895's (doesn't matter who's) are listed for levers and not Ruger / Siamese. The reason is you have already maxed out the case and we are still talking 26-28k psi / CUP. You don't really see it used for anything other than jacketed in the stronger actions.
Too slow for a trapdoor action unless you are using heavy (500+ gr.) bullets. Even then it is a bit too slow.
For levers and stronger, think near full to compressed loads at any bullet weight. You will see in some cases where the 4895's (doesn't matter who's) are listed for levers and not Ruger / Siamese. The reason is you have already maxed out the case and we are still talking 26-28k psi / CUP. You don't really see it used for anything other than jacketed in the stronger actions.
ArchAngelCD
Member.
I like a faster powder in the 45-70 too but not quite as fast as what you're using. I load either H4198 or AA5744. I've been using a lot of AA5744 lately, I like the results it delivers.
i normally load imr4198 or reloder 7 in my 45/70. but i bought this 4895 by mistake, (should have bought H-4895 for reduced loads for my son) so i have to burn it up or dump it on the lawn. burning it up is a LOT more fun than growing grass! i will try it is other rifles also, see if i can find something it is good for. fwiw, the 45-70 is a marlin. i also have a 30-30, 223, and 300 win mag. probably, i will find something that likes it, just about the time i am running short on it. that is about my luck.
It works like H4895 in 30-30, 308 - good. Have you tried a heavier bullet in 45/70? Dacron will reduce any position sensitivity and COW will increase 'effective' bullet weight and pressure. If it does what you want, a little unburned powder is not a problem.
Last edited:
Jim Watson
Member
4895 is not a best choice in .300 magnum, either.
But it will shoot if top velocity is not required.
But it will shoot if top velocity is not required.
Accurate 5744 or IMR SR4759!
Accurate isn't very position sensitive and very bulky;tailor made for your application. SR4759 also works well for this application.
For reduced loads you should be looking at Trapdoor data. Starting loads with either of these two powders according to Lymans out of a Trapdoor pushes a 300 gr. bullet out on the underside of 1300 fps.
dc.fireman
Member
IMR-4895 is FANTASTIC in the .223 Remington.
ArchAngelCD
Member.
IMR4895 will work well in the 30-30 and in the .223 too. No need to use it on the lawn. If it were a specialized powder you might have a problem finding a use for it but both 4895 powders are very flexible in what they can be used in. As for light loads in the 45-70 I agree using 4198 or AA5744 will produce lighter ammo than the reduced loads using H4895. All you need to do is use Trapdoor load data which will keep the pressures below 28,000 CUP. Using a light bullet will also help with reducing felt recoil.
The Hodgdon Load Data Site lists load data for the 45-70 using a 300gr Cast bullet and IMR4895 under Trapdoor data. The starting charge weight under a 300gr LFN bullet is 47.5gr IMR4895 and that load generates only 16,500 CUP. That should be a very soft shooting round and it uses IMR4895.
Last edited:
Kevin Rohrer
Member
Only use magnum primers when reloading manuals call for them.
There have been some data I've seen where using mag primers with 4895, 4064 and 4350 reduces the FPS spread considerably in 3006 and 308. You have to adjust the loads accordingly to avoid overpressure. I'm not a good enough shooter to have such translate into better groups.
- Status
Similar threads
- Locked