H4895 vs IMR 4895

[Chief 101]

Me thinks they meant .25%. For example in one book in my library it states that a max load of H4895 at 43.5=2694fps whereas a max load of IMR4895 at 53.3=2680fps. These are for .308 Win with a 165 jacket. This appears to be consistent with results I have had over the years with the two powders.
Chief aka Maxx Load

 

[Rick Courtright]

Hi, CD

What cartridge and bullet weight are you working on right now?

I think I still have some old IMR data from before the Hodgdon's era, and will be happy to see if there's anything listed that'll help you.

Rick C

 

[63November]

Of the various powders with similar nomenclature I believe the 4895s are more similar to each other than most any others. I use them, after working back up, just as with any powder lot change, at virtually interchangeable weights in most cartridges. You cannot do that with 4198 or 4831 as the IMR versions are significantly "faster" than the Hodgdon versions.

FWIW, while lot to lot variations may differ on this, I have had slighter "faster" results with IMR than H versions of 4895. By slight I mean barely noticeable, perhaps 25-30 fps.

 

[Rick Courtright]

I picked up some 125 gr jacketed bullets, and I'm working on a load for a 7.2x54r round. These are .310.

CDFiners

Hi, CD

PM sent...

Rick C

 

[Paul B]

Me thinks they meant .25%. For example in one book in my library it states that a max load of H4895 at 43.5=2694fps whereas a max load of IMR4895 at 53.3=2680fps. These are for .308 Win with a 165 jacket. This appears to be consistent with results I have had over the years with the two powders.
Chief aka Maxx Load

I sincerely hope that the difference between to two loads you show is a typo. I've used both versions of 4895 for more years than I care to count. Back in the 1960's, H4895 was cosidered the slower of the two. Then sometime in the 70's their positions were reversed. :shock: Now that Hodgden controls both, they may now be exactly the same with the only difference being in their lot numbers. I think you could drop back one, maybe two grains and work back up just to be on the safe side.
Paul B.

 

[Chief 101]

Paul, yea that is a definite typo...should have read 43.3 on the IMR powder. Tanks for the help. I try to reread what I write here but sometimes things get past me. Chief aka Maxx Load

 

[wheezengeezer]

"H4895 at 43.5=2694fps IMR4895 at 43.3=2680fps." This shows an almost identical burn rate in this application.Most loads will have more SD than that