H4350& IMR4350 two different powders?

[lezmark]

I bought some H4350 to load for a cherry pre 64 270 I just picked up. I like to use several references before I start work up loads. The Hodgdon site shows different loads for these powders. What is interesting is the the 49th Lyman and other load books dont show a listing at all for H4350!? Is it new? IMR4350 data seems to be everywhere. Any insight would be greatly appreciated.

 

[ClickClickD'oh]

Modern H4350, IMR4350 and AA4350 are the exact same thing. Old versions are slightly different.

 

[lezmark]

Not to question you, but it does add to the confusion and questions when the Hodgdon site right now shows a difference between the two for the same bullet....

 

[morcey2]

Modern H4350, IMR4350 and AA4350 are the exact same thing. Old versions are slightly different.

Um, no they're not.

If you ask Hodgdon, they'll tell you that IMR and H are close, but definitely not the same and the load data is different. IMR is somewhat temperature sensitive and H is not nearly as sensitive being an Extreme powder. AA is, again, close but you can't use the same load data for them.

Can you find a load weight that just happens to work for all three of them with the ? Yeah, probably but that doesn't mean that they're the exact same thing. I use all three for different purposes, but mostly H and AA.

Matt

 

[Kaldor]

Um, no they're not.

If you ask Hodgdon, they'll tell you that IMR and H are close, but definitely not the same and the load data is different. IMR is somewhat temperature sensitive and H is not nearly as sensitive being an Extreme powder. AA is, again, close but you can't use the same load data for them.

Can you find a load weight that just happens to work for all three of them with the ? Yeah, probably but that doesn't mean that they're the exact same thing. I use all three for different purposes, but mostly H and AA.

Matt

Exactly. There is a reason that H4350 is almost impossible to get in any quantity unless you get yourself on a waiting list. I cant remember the last time Ive seen this stuff anywhere local.

 

[Parman]

I load my 300 Wby and 500 Mag on single stage everything else I do on my L-N-L.

 

[SwaneeSR]

H4350 and IMR 4350 both work well for me in .30-06. Slightly different charge weights of course. I slightly prefer H4350. I have had good luck finding H4350 recently. I will need to pay more attention to the supply.


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[ants]

Here are actual numbers...

Almost identical powders but not quite the same.

Each brand orders slightly different coating, so the Burn Rate Factor is slightly higher for IMR-4350 (0.5150) compared to H-4350 (0.5130). This is from the powder specification data in QuickLoad. That's why H4350 is slightly slower on Hodgdon's own burn rate chart.

AA4350 is even slower with a burn rate factor 0.3810. It also has a much lower density. Very different powder indeed.

All three powders are very close, so if you like one for a specific application you just might like the others. But better get correct data for each.

Let's avoid unfortunate mistakes. Use appropriate data for each powder. (Unless the manufacturer specifically advertises that they are identical, like W231 and HP38).

 

[lezmark]

I ordered a few pounds from Cabellas - they had inventory a couple days ago. They even had Varget. I am still surprised that Lymans and others dont even show loads for H4350. Any of you loading a similar type gun with some successful recipes if you could share it would be appreciated.

 

[ants]

H4350. Any of you loading a similar type gun with some successful recipes if you could share it would be appreciated.

Since it's pre-64 we know you mean 270 Winchester. Not WSM or Weatherby.
But it would help to tell us bullet weight and type of shooting (deer, elk, paper targets, zombies, terrorists, etc).

Actually I've always achieved better results with 4831 and R22. H4350 isn't bad at all but I find better results elsewhere.

H4350: Although Hodgdon shows 55.5 grains max for 130 grain bullet, I've only had accuracy at 55.0 or slightly less. Start at 51.0 and work up 1/2 grain at a time.

 

[Slamfire]

When H4350 was first introduced on the market, the claim was it was identical to IMR 4350. I bought a whole bunch of H4350 and I can say, there is a small difference between what I have and IMR 4350, it takes about a grain of H4350 more in the 30-06 to achieve the same velocity as IMR 4350.

I am of the opinion that lot to lot variations are larger than any other difference. Of course, the manufacturer's of IMR 4350 and H4350 can change the formulations any way they wish, can blend them any way they want. I recommend, buy by price, test the stuff, and see which one you prefer.

 

[lezmark]

Mostly paper with Sierra 135 matchpoint in 270

 

[ants]

OK, 135 SMK.

55.0 is a good load for 130 grain, but Hodgdon keeps a rather low max load for 135 grain with H4350.

Start at starting load and work up to max. See where it shoots that 135 best.

 

[GooseGestapo]

I mostly use and prefer IMR4350. It's slightly more accurate than H4350. However, H4350 gives higher velocities, though at slightly higher charge weights.
However, I prefer RL17, to either. It gives H4350 speed, with IMR accuracy, but at IMR charge weights.
H and RL17 are better in smaller cases such as .260Rem or 7mm08. In the .338/06 and .375Ruger, I prefer IMR as its slightly bulkier.
Clear as mud?