H4350 VS IMR4350

[baldhunter]

I've been using mostly Accurate 4350.I did a test on all three using same charge and bullet.Accurate 4350 gave me just little tighter group with the best velocity.IMR-4350 was close in velocity with just a little larger group.H-4350 was a bit slower by around 20-30fps slower than the other two and came in second to the Accurate 4350 in group size.

 

[PApa Black]

Ok, I'll post this again since your search button is broken.

IMR 4350 and H4350 ARE NOT THE SAME POWDER OR ANYTHING LIKE THE SAME. Only the numbers are in common. IMR4350 is substantially faster burning. IMR4350 powder DOES NOT contain a copper remover. You're thinking about the new Enduron line of IMR powders, not their legacy powders.

H4350 is very temp stable. IMR4350 is not.

If you get 1 granule of IMR4350 in a load of H4350 you'll get to throw that piece of brass away when the primer falls out and you might get to throw the extractor or the bolt away too. DO NOT MIX EVEN 1 GRANULE OF IMR4350 INTO AN H4350 LOAD. Ask me how I know.

An IMR4350 load will produce higher peak pressures than an otherwise identical H4350 load. I have successfully substituted IMR for H by dropping 1-1.5 grains per 40 grains of total charge weight. I do not recommend being as flippant as I was. Probably start 2 grains lower with IMR4350.

They really are different. Just because one CAN work in the loads the other works best in doesn't mean it's a good idea. High peak pressures and low velocities are the rewards for using too fast a powder.

Correct " BallisticsGuy" !

 

[eastbank]

one granule(is not a grain) of imr 4350 in a load of H 4350 will not cause any thing in a normal load for any caliber. as a matter of fact about 25-26 granules of imr 4350 weights about 1 grain. a grain=1/7000 of a pound.

 

[Uncle yib]

I am having issues finding H4350 my Lyman manual shows very similar performance with IMR and I think all IMR powders are suppose to have some copper fouling inhibitor in them. So what is the difference does anyone have a history with the IMR powders?

You should go to Hodgkin.com they have a load manual online over there it'll give you loads but you should really look in the 1967 lineman manual or go to the new Hornaday manual the H powders are in there but do not make the mistake of using the numbers for one to load the other you may blow yourself up be very careful

 

[PApa Black]

You should go to Hodgkin.com they have a load manual online over there it'll give you loads but you should really look in the 1967 lineman manual or go to the new Hornaday manual the H powders are in there but do not make the mistake of using the numbers for one to load the other you may blow yourself up be very careful

http://www.hodgdonreloading.com/

 

[David Emerson]

I am having issues finding H4350 my Lyman manual shows very similar performance with IMR and I think all IMR powders are suppose to have some copper fouling inhibitor in them. So what is the difference does anyone have a history with the IMR powders?

In my experience in MOST guns imr 4350 is a touch faster burning. And the regular imr powders have no copper inhibitor. Only the enduron series.

 

[Deleted member 107796]

I use both for anything from 270win to 338wm. Some loads/rifles prefer one over the other but I'm getting great performance from both, tested from summer range temps to the early Dec hunting we do.

 

[Patton243]

If you can't find H4350 try Reloader 16 or IMR4451. Both have similar burn rates as H4350. Temp insensitive too. IMR4350 is not temp insensitive so I would stay away.

 

[PApa Black]

I am having issues finding H4350 my Lyman manual shows very similar performance with IMR and I think all IMR powders are suppose to have some copper fouling inhibitor in them. So what is the difference does anyone have a history with the IMR powders?

The following is a list of temp. insensitive powders I got from Hodgdon:
Mike Van Dyke

Customer Service Representative

Hodgdon Powder Company

6430 Vista Drive

Shawnee, Ks. 66218

913-362-9455 Ext. 109

Temperature Insensitive Powders

Benchmark
H1000
H322
H4198
H4350
H4831
H4831SC
H4895
H50BMG
IMR 8208 XBR

Retumbo
VARGET
IMR Enduron 4166= 308 Winchester, 7.62mm NATO, 22-250 Remington or 257 Roberts, among other cartridges.
IMR Enduron 4451 = 270 Winchester, 30-06 or 300 Winchester Short Magnum, among others.
IMR Enduron 7977 = 300 Winchester Magnum, 7mm Remington Magnum and 338 Lapua, among other cartridges.
IMR Enduron 8133 = 6.5-300 Weatherby, 264 Win Mag, 28 Nosler and 300 Rem Ultra Mag, among other cartridges.