Home Forums Hunting & Shooting Long Range Hunting IMR4350 Vs. H4350

80 degrees would be a cool day in Florida. Triple digits are common. I live in North GA and upper 90's are not uncommon during summer months when shooting at the range and temps in the teens are common later in hunting season. Single digits are not unheard of.

I've only used H4350 in 6.5CM and it has done so well I've not been tempted to try anything else. But I've used both in 30-06. Accuracy and velocity are nearly the same, but I prefer H4350 simply because of temperature sensitivity. It may never make a difference for me. But there are no downsides either. If IMR4350 were more accurate for me I would use it.

Hodgdon likely hasn't gone full blown public yet because there is probably still stock to sell, but ALL the powder distributors are saying Hodgdon has announced the end of the IMR Enduron line. So unless that is not infact true, there will be no more production of 4451. Little surprised you wouldn't know of this already, unless of course you know something we don't know. I for one would like to see 4451 stick around.

Imr4350, H4350 and 4451, I've used all and wouldn't have an issue subbing any over the other (not grain for grain of course).

IMO, people spend way too much mental time obsessing over powder and fiddling with stuff instead of shooting, or dinking at the bench.

Imr 4350 is so versatile, as is h4350. I've used it in a fast twist 22-250 all the way to a 300 win mag

Yep, IMR4350 is very versatile--one reason that way back when I could finally afford to buy powder in 8-pounders instead of 1-pound cans IMR4350 was the first.

But I don't even have any in my powder collection any more, for two reasons: Montana has the widest recorded range of temperatures of any of the 50 states, from -70 to +117--and I've actually hunted at -40 and +105. Plus, its long granules don't run through a measure as easily as the "short-cut" granules of H4350.

Couldn't agree more. Varget and h4831sc have quickly became my favorite. In western oklahoma we see minus 5 to 105.

I strongly prefer h because I live in Idaho and often work up loads in the summer to hunt with when it's cold. I also think h4350 meters better than imr 4350. H has also proven very consistant speed wise in a lot of my loads meaning low extreme spreads and sd's which matters a lot at longer range.

My favorite rifle powders are h4350, h4831sc, and H1000. I also love 8208xbr which is IMR but also made by ADI in Australia like H extreme stuff. The imr enduron stuff was interesting but I'm not sure why it was all discontinued so soon. Another imr I still use a lot is 7828. It works awesome in my 264 win and a few others.

Bb

I run 7828 SSC in my 243 AI and like it a lot.

IMR 4350 meters like doggie dodo, so I quit using it for small caliber applications like 6mm Creedmoor.

well I am in the age of the IMR LOL but I generally reach for an H version powders. maybe they're extreme marketing line got to my brain..

I used IMR4350 in the .243AI with 105s a bunch in the temp extremes we get here in Alberta, and velocity, variation, and POI were all amazingly consistent. And AB has an even wider range of recorded temps than Montana. I have been using 7828ssc in the 7WSM and 7RM with 162s and 180s for years, and it’s always been a great performer in that application. I also use a lot of H4350, 4451, 4166, H1000, TAC, etc., and they’ve also been very consistent. I burned out a couple of match barrels with R26, but moved away from it since it showed more temp dependence than some of the others. That, and the availability and price were less attractive than other similar powders.

Jordan,

I eventually arrived at the same conclusion about RL-26, and sold my last few pounds a year or so ago.

As noted in an earlier post IMR4350 can be very temp-resistant, especially if compressed, and used with a magnum primer. But eventually preferred the "easy button" of H4350, or IMR4451. Luckily I have a good supply of 4451....

John,

Why’d they quit making 4451 and the like?

Not Mule Deer but I heard that Enduron powders production was suspended due to the need for more military capacity at the General Dynamics plant in Valleyfield, Quebec, Canada where the Enduron powders were made. Here are some links to General Dynamics plant info:
General Dynamics Ordnance and Tactical Systems Plant Locations
General Dynamics Ordnance And Tacti...Energetic Materials Manufacturing Plant

Serious question here, is there any application for these powders where you couldn't use Big Game or perhaps RL16 instead?

I’m with you there, John. When I ran low on IMR4350, I found that H4350 and 4451 did just as well, and were easier to meter. Like you, I fortunately laid up a healthy supply of 4451 before it disappeared, though I have found that H4350 often gives less velocity variation.

Finally! Someone mentioned the biggest improvement with H4350 for those of use who don't like to trickle every charge.

A lot of very good comments have been posted and I have given consideration to all of them. To summarize, unless one live in an area that undergoes extreme temperature fluctuation (Mule Deer in MT) there is very little difference between H4350 & IMR-4350, except ease of measuring. As stated, I've used IMR-4350 in 30-06 loads for years and haven't noticed any temperature related problems;however, living in NW Fla. it's just hot most of the time, unlike MT, ID, etc. with their extreme cold - extreme hot fluctuations. I have an ample supply of both powders, so I will amuse myself and experiment for a while.
Again, thank you for your input.

The young guys call IMR 4350. “An old man powder”

I'm 68 hanco and basically quit buying imr 4350 25 yrs ago. H4350 much better. Mb

Not that easy, damn stuff is as bad as 4064 you'd think you were trying to run Lincoln logs thru the measure..mb