IMR 4350 or H 4350 for a swift A frame out of a 375 H&H

[Rburns28]

Anybody got any advice on which powder would be a better choice? Will be working up a load for cape buffalo and plains game. From what i've found looks like the H4350 has a little faster velocity over all. Not really concerned with speed more concerned with better groups and being accurate. I will be using 300 gr bullets. Thanks for any input, Randy

 

[Green Chile]

H4350 gets faster velocities. As to grouping, there is no way to know without running some groups through your rifle. Every gun is a little unique. Most likely result is you will find groups that are better than can be held in field positions.

 

[Yukontom]

Anybody got any advice on which powder would be a better choice? Will be working up a load for cape buffalo and plains game. From what i've found looks like the H4350 has a little faster velocity over all. Not really concerned with speed more concerned with better groups and being accurate. I will be using 300 gr bullets. Thanks for any input, Randy

They are very much alike so you will probably get similar results. The H4350 is supposed to have a slightly slower burn rate so maybe a bit more powder but you don't know until you try. I do use way more Hodgden powders over IMR including H4350. Recently it also depends on what you can get. Lots of H4350 out there right now.

 

[Ontario Hunter]

I believe Hodgon owns IMR now?

For my 404J I use Accurate 4350 (A4350) which also I believe is now under the Hodgon umbrella. It gives very good groups with 80 gr pushing 400 gr Barnes bullets. I need to chronograph that load but I suspect it's around 2200 fps. At fifty yards bullets are landing on top of each other (very fat bullets). At 100 yards it shoots about MOA, maybe a bit more. But I'm 72 and shooting on sticks.

Accurate powder was all that was available when I finished building the gun in June 2023. Kinda hard to find load data but from what I've seen, it seems all three powders perform very similar. One does a bit better in extreme temperature environments (IMR?).

 

[Wyatt Smith]

Either one is fine.

 

[Fryeguy]

One thing to look at as well is the temp stability. I think H has it, IMR doesn’t. It probably doesn’t matter at all unless you are running upper end pressures and then change to a much hotter atmosphere, but it’s something to look into. Having said that, I found better accuracy with IMR in my last 375 and 270 aframes. I also go for accuracy not necessarily speed. I try to find the balance between both, I don’t want to be shooting too slow.

 

[uplander01]

Agree with the previous post, I think H4350 will have more temp stability, at least that's what they preach about extreme powders.

 

[WyoBull]

Either one will be fine, I just have never used it for the 375 H&H. A friend of mine who used to be one of my college professors back in the day turned me onto his 375 H&H load. He uses RL15. I used it when I worked up a load for my rifle and it shot so well I never even looked at anything else.
Good luck with your load work up and post some target pics when you get it dialed in.

 

[uplander01]

If you have access to good old' IMR 4320, I've had fantastic luck with that powder in 375's. Lowest standard deviation of any powder I've handloaded for the 375.

 

[C.W. Richter]

RL15 is best in 375. CCI 250s best SD. LOVE many IMRs, but this one works (several RLs work best in larger for caliber cases.) Consider the 350s if DG is involved. Swift SP/Barnes Banded S or TSX for all

 

[PHOENIX PHIL]

I don't know how H4350 does in my M70 375HH with 300gr projectiles. I started with IMR4350 and never found a reason to try another since the accuracy was outstanding with whatever 300gr bullet I topped the round with.

Your rifle may prefer H4350 or even RL15 (if you can find it) as suggested above. Only one way to find out. If you want to try a faster powder, Varget is usually considered the twin brother of RL15.