IMR 4350 temperature sensitivity?

[DBWY]

Overthinking this or not?

I like 4350 in a number of applications but have always used H4350 for actual hunting loads in the belief that it was the less temp sensitive of the two but rarely have I seen marked differences between the two powders in load development apart from a few fps.

Worked up a nice load with H4350 for my youngest who will have his first deer tag this year - 140 grain Speer in a tight little sporterized Swedish Mauser. Fits him reasonably well, not a lot of recoil. He's pretty confident out to 250 yards.

Come to find I like H4350 so much that I've got about 1/4 lb left but 3 lbs of IMR4350. No H4350 at LGS or at Cabelas I went by yesterday. So, am I overthinking it?

I can't imagine it'll be more than a 1.5 grains ladder to find the IMR 4350 that works best. Shooting in the 70s and 80s now, likely be 30s - 40s in the Big Horns next month. Since he'll be confining himself to 250 yards, is the temperature sensitivity enough to possibly matter?

 

[ArchAngelCD]

I use both H4350 and IMR4350 in the 30-06. My favorite is H4350 but my son's Remington 700 likes IMR better.

I have found over the years when I find a good load with H4350 I can usually cone close to duplicating it with ONE grain less of IMR4350. The IMR version is slightly faster than the Hodgdon version. As for one being more temp sensitive than the other, I can't tell the difference but then again I rarely shoot in temps below zero, extremely rarely.

Of course it might not be the same for you but I'm betting it will be close.

 

[splattergun]

I think temp sensitivity in this case is more a matter of rumor than anything else. Unless you're developing your loads in 90s + then hunting in -10s there will not be enough difference for any hunter to notice.

 

[243winxb]

Overthinking

 

[hdwhit]

Check the Hodgdon reloading site and see what they recommend for that bullet. As you know, the Hodgdon and IMR powders are similar but not the same, so some adjustment will be needed, but it shouldn't be very much.

 

[DBWY]

Thanks. I'll work up the IMR load and worry about something else, like nuclear war with Rocket Man...

 

[dh1633pm]

I have worked hard trying to get some H4350. Just can't find any around here. I have IMR4350 and AA4350, and wanted to say thanks for the info on the IMR. It adds to the knowledgebase.

 

[Nature Boy]

I have about 10lbs of IMR4350 on hand for .30-06

It works so well that I haven't felt the need to go on the hunt for any of the H variety. Let's the cool kids with their fancy trick shooting "Creeds" have it

Seriously though, I read and hear that ALL powders are temp sensitive to some extent. I have no frame of reference to compare H vs IMR. If you end up with a pound of each work up a little test and let us know

 

[Sunray]

"...Overthinking this..." Probably, but the two 4350's are NOT interchangeable. If you opt for the IMR you must work up the load again.
It for a 6.5 x 55? Only use the IMR in .243. Max 140 grain loads are really, really close, but the IMR's is 45.0 vs 44.0 with 300 CUP more pressure and 60 FPS faster.
Ladder tests tell you nothing about the accuracy of a particular load. It only tells you where a particular load hits in comparison with other loads.

 

[joed]

I'm in agreement with Nature Boy. IMR4350 worked better then H4350 for me so I just stayed with it. The only problem I ever had with sensitivity was H380. My feelings are that the gun being cold or hot also contributes to the sensitivity. The reason I say this is as the gun heats up on cold day the POI does change somewhat.

 

[cougar1717]

I am just imagining many of the deer hunters across this great land, examining brands of cartridges at their local WM, with extreme concern over the temp sensitivity of the cheap ball powder in those cartridges.

 

[.308 Norma]

I am just imagining many of the deer hunters across this great land, examining brands of cartridges at their local WM, with extreme concern over the temp sensitivity of the cheap ball powder in those cartridges.

Ha! You have quite an imagination!

 

[Captcurt]

IMR-4350 has been my go to powder for 40 years in most of my rifles. It has worked at 100 degrees to 5 below zero. Never noticed anything to suggest temperature sensitivity.