H4350 vs. IMR 4350

Loading for .22-250, .243, and .30-06. Which powder, and why?

I've heard that H4350 is very temp stable, and load data seems to show lower pressures compared to other powders. However, I have no experience with either one. Give me your recommendations.

Thanks in advance,
Brian

Both are great powders Brian. You are correct in that H4350 is supposed to be a bit more temp stable than IMR4350. That being said, IMR4350 is what I use in my 6mm Remington (very close to your .243), and my own 30-06. It has worked very well for me in all conditions from hot weather to extremely cold, way below zero.

30-06 : 165 gr. AccuBond or Partition 57.4 grs. of IMR4350 - Winchester brass - Federal 210 match primer. (This load has worked very well in two 30-06 rifles I shot them in. Of course work up to this in your rifle.)

David

The Hodgdon temp stability thing is way overstated, especially in 4350, but H4350 is a great powder for .30-06 and .243. So is I4350; some rifles use both well, while others show a preference for one over the other.

4350 is a bit slow for.22-250, and you will likely run out of room before reaching max velocity, but I have heard reports of great accuracy in some .22-250s. Try H380, which was literally developed for the .22-250, Varget, RL15, or 4064. All of these work great for the .22-250, but also do very well in .30-06 and .243.

EastTNHunter":3kab7hs2 said:

The Hodgdon temp stability thing is way overstated, especially in 4350, but H4350 is a great powder for .30-06 and .243. So is I4350; some rifles use both well, while others show a preference for one over the other.

4350 is a bit slow for.22-250, and you will likely run out of room before reaching max velocity, but I have heard reports of great accuracy in some .22-250s. Try H380, which was literally developed for the .22-250, Varget, RL15, or 4064. All of these work great for the .22-250, but also do very well in .30-06 and .243.

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Yeah, I've got loads for all 3 with 4064. It's been my go-to powder for years. But variety is the spice of life.

If that's the case then I'd go with the I4350 due to availability. H4350 seems to dry up quicker and come to market later than the IMR

my kids weatherby vanguard loves h4350 with any bullet in 243. imr not so much

I have used both quite a bit for several 30-06s, and both are very useful. If forced to choose I would pick H4350, but only because I travel to hunt and sometimes I live somewhere difficult to work up a load for expected conditions. For instance, for a couple years I lived in Las Vegas heat and went to Utah for elk at -5 degrees. If I didn't travel either would be fine. A really good aspect of IMR4350 is it's really a safe powder for the 30-06, you run out of case capacity before pressure gets too high.


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I really like H4350 but it has turned to unicorn pellets in a lot of places. I have not seen any on the shelf in over a year at my local shops. I will be working with IMR 4350 soon to try it out.


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I went with IMR4350 because it was available and haven't had a reason to switch. I did try H4350 in a couple of calibers but the results didn't induce me to change. Recently I have made an effort to reduce the number of powders that I use just to simplify my life. IMR4350 is one that I'll continue to use. I use it for 243, 257R, 30-06 and 338WM. The oft repeated word is H4350 is more temp stable. I really can't say but i've never had an issue with IMR4350 from below zero to 80+ degree temps.

IMR 4350 is now the only rifle powder I use. I live in central georgia where the temps get real hot and the humidity is almost always 100% in late spring and summer. Most of my load work is done this time of the year for a fall elk hunt where it's sometimes sub zero. I've never had a problem and think most talk of IMR 4350 being temp. unstable is overstated.