I have a load that is shooting awfully good in my 25-06 using IMR-4350. I loaded up all of the IMR4350 that i had and i'm in need of about 3-4 more pounds of it. I've checked around at several places around here and no one seems to have IMR4350 however several have said they have H4350. If i remember correctly, the burn rates on the two are a little different. The next gun show is a ways away so i was wondering how much of a difference there actually is between the H4350 and the IMR4350? Maybe i could get a pound of the H4350 to hold me over until the next gun show if they are very similiar in performance. Thanks guys
Ruck

the diffrence is so minimal that its non existant in both pressure and velocity in the pressure gun ...however H4350 is far more temp insensitive
regards daniel

M98 has offered good advice.....and I wouldn't go back to the IMR powder. Stay with the Hodgdon powder. IMO it's a better product.

Thanks guysm, i really appreciate the quick response!
Thanks,
Ruck

IMR should be easier to find than H4350 from my experience. Either will work great. Watch vapo, he stongly encourages people not to make the powders interchangable on another website. Really couldn't give a reason, but this struck me funny he is now saying go ahead. Guess my posts made an impression.

quote:

Originally posted by bigcountry:
IMR should be easier to find than H4350 from my experience. Either will work great. Watch vapo, he stongly encourages people not to make the powders interchangable on another website. Really couldn't give a reason, but this struck me funny he is now saying go ahead. Guess my posts made an impression.

Actually what was said is that I don't think it's a good isea to substitute one powder data for another powder. If one goes to the IMR website it confirms that.

What's being said here is totally different. This thread does not say to use the data for IMR 4350 for use with H-4350.

I've found that H4350 is a bit slower in my .338-06 & .260ai than IMR4350, nit much but enough to make the data NOT interchangable.

Sure Vapo, Me and you both know.

I read the thread on forums.hunting.net and Agree with Vapodog. Big Country was full of shit on that thread.

quote:

Originally posted by bigcountry:
Sure Vapo, Me and you both know.

Hey man, it wasn't I that said it was ok to use H-4350 instead of IMR-4350 if one couldn't find the reloading data for the powder he had.

Packer, a freind of mine asked if he could exchange H4350 for IMR4350. I looked up alot of data in different books, and came to the conclusion for the caliber he was loading, and bullet, that yes, just do as you are supposed too, and start loaded down as you were supposed too. Vapo got on there and big letters and drama said "NO". So if thats being full of it, I will take being full of it anyday. By the way, my friend saw this and agreed with me so did several of the posters that emailed me. So I think I am safe and sound from being full of it. And his load is safe and sound.

I asked Vapo how does one work up a load for bullets without data like the TBBC. He never replied. Of course. He needs some words on the internet to make hime feel secure. I tried to explain to him as gentle as I can, since he has a flair for the dramatic, that data in most manuals is data for one man for one gun. He never did get it.

He went off on some more drama, talking about powders that my friend was not even interested in. Nor was I. Hey you guys sound perfect for each other.

Now, how was I full of it again? Maybe you can private message me and show me and educate me. I doubt you can or will. But I am opened minded to learn new things.

here it is for anyone that wants to read it for themselves

Before we get completely off the track, there are some slight differences in the 4350's Accurate produces one too. As long as you start low and work up, you shouldn't have any problem. I prefer H4350 for a lot of stuff, it works real good in my 300WM, and I also use it in .243, it's really a versatile powder.

DGK

I find it easier to get IMR powder, but about 50 minutes drive a shop has any powder I want. I use a lot of IMR 4350 for my 300 Win Mag. I wanted to use it in my 416 Rigby, but could not find load date for the IMR 4350, but I could find it for the XMR 4350 and H 4350. So I went to Reloader 22 so I could get some loads made up, and I am glad I did, I found a great load for my 416 Rigby.

But if you find a load that works well stick with it.

In another thread somewhere on this forum there was a discussion of this question, and someone replied that present-day H4350 is actually faster-burning than present-day IMR 4350.

I don't know whether that is true or not. I do know that the lot of H 4350 I've been using that I got some years ago is definitely better than any IMR 4350 I've tried. My H 4350 is slightly slower burning and has allowed me to get loads that give significantly higher than the usually published velocities from the 375 H&H, the 7x57 with 175 grain bullets, and the 30-06. It is also very accurate.

quote:

Originally posted by LE270:
In another thread somewhere on this forum there was a discussion of this question, and someone replied that present-day H4350 is actually faster-burning than present-day IMR 4350.

Hodgdon says it's slower...

81. IMR, Co IMR4350
82. Hodgdon H4350

I suspect Hodgdon would know.

My old lot of H-4350,went sweet at bit higher pressure than the my lots of IMR-4350.The IMR was also faster.I was loading six 30.06,searching for that one load for them all.But recent posting on short cut H-4350 note a change.

on the pressure gun both 58 gns of IMR and H 4350 gave a pressure of about 63,800 and a velocity of 2810 fps and that was in the 30/06 with 180 gn noslers ..5 shot average
from my experience they are pretty close however H 4350 is much less temp sensitive
regards daniel

quote:

Originally posted by Packerbacker:
I read the thread on forums.hunting.net and Agree with Vapodog. Big Country was full of shit on that thread.

I might not have said it quite that strongly but it's not the brightest bulb on the tree that says that it's ok to use one powder when looking at the data for another powder. While one might get away with it sometimes it sets a very dangerous precident. Good point Vapodog.

Packerbacker, could we have just said that Big Country might want to rethink his position on this? F O S is so undiplomatic.

Well one thing I didn't say that duik. That was a marvelous simplification of what I said. I said for his instance, his rifle, his bullet, if he started out at min or starting load and worked his way up with either IMR4350 or H4350, then he would be fine.

Its ok what packer said. Free country to look stupid or not. I am still waiting for that education. His statement said alot about him.

Shooting yesterday with my .270. Worked up in .5 grain increments both H4350 ( up to 56grns) and IMR 4350 (up to 55 grns) behind Sierra Pro Hunter 130 grns. Groups across the board were 30% better with IMR4350. My very scientific conclusion...they are not the same, heck if I know what the differece is but the IMR clear shot better in my rifle yesterday.

Ned, I found the same thing with the same exact results but with gamekings and not prohunters.

Since I did that years ago, I have been a IMR4350 fan for 30-06, 270, 300win, even 300RUM for some bullets.

I found the speed almost identical but vel. spread and accuracy were totally different. I never did hit any pressure signs up the same loads you did.

Did you see any at 56gr?

Well like a fool I ran to the range at daylight yesterday as I was so excieted about Zero wind and I forgot my chrono so I can't give real stats. I'll do my best to pack correclty and post the results next week....should be interesting. Zero pressure signs at book max per Sierra on either.

quote:

Shooting yesterday with my .270. Worked up in .5 grain increments both H4350 ( up to 56grns) and IMR 4350 (up to 55 grns) behind Sierra Pro Hunter 130 grns. Groups across the board were 30% better with IMR4350. My very scientific conclusion...they are not the same, heck if I know what the differece is but the IMR clear shot better in my rifle yesterday.

If memory serves, I believe 4350 started as a military powder, and after the initial surplus ran out, all the manufacturer's started "tweaking", on the origional formula. That's the main difference. The same holds true for the 4198's, and the 4895's. all the major powder companies make one, but the aren't necessarily interchangeable. That's why we have different listings in the manuals.

DGK