IMR vs Hodgdon

DGY

DGY

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Good day all, I was wondering if there is a big difference between IMR and Hodgdon in term of temperature sensitivity? For exemple, H4895 vs IMR4895?
Just wondering, there is quite a bit of IMR available at my LGS and I’m running out of h4895!
Thanks
 
Is a good question - was always the "selling point" that H was a better choice than IMR for cold weather, but I have never really compared to know if that was true or not.
 
I can tell you for certain that in 4227 that the H is much better. Group sizes @ 100 yds with a .25-20 Stevens
went from 4" to 1 1/2".
 
The way I would check for what I think is "temperature sensitivity", is whether the groups got larger or smaller, or whether the Point of Impact changed - say some 5 shot groups at circa 20 C and then same at circa minus 30 C - I suspect, but do not know, that might be the temperature extremes that Yukon hunters might experience? I do not know if that was "normal" or not, but a CGN guy from Manitoba (at the time) told me it was clear and minus 50 C when he got a nice musk ox bull - on Ellesmere Island, I think.
 
Potashminer said:
The way I would check for what I think is "temperature sensitivity", is whether the groups got larger or smaller, or whether the Point of Impact changed - say some 5 shot groups at circa 20 C and then same at circa minus 30 C - I suspect, but do not know, that might be the temperature extremes that Yukon hunters might experience? I do not know if that was "normal" or not, but a CGN guy from Manitoba (at the time) told me it was clear and minus 50 C when he got a nice musk ox bull - on Ellesmere Island, I think.
Click to expand...

We have everything from +30c to -50c!
Normal is not the norm up here hahaha!
 
Honestly, buy what you can find and adjust your loads accordingly. We get lots of people in the store asking for specific powders we haven’t seen in the 3 years I’ve worked there. H4895 is one of them, IMR 4895 works similarly from my experience but not identical.
 
Thanks everyone, from what I read, the difference in temperature sensitivity is not much and poi is not really noticeable or at least should not create a problem inside of 300m, most are saying that past the 300 mark you might end up off kill zone depending on animals!
 
Sort of goes to what you think is "sensitivity" - I think that chart, for example, says RL 15 will change your muzzle velocity by 1.52 fps per degree F in temperature change; whereas N140 will change 0.4 fps per degree F in temperature change. I think most will find that their groups will impact lower, at distance, with slower muzzle velocity - is as likely that the barrel may throw the bullet left/right/up/down as the speed goes up or down. So what you get at 60 F as "good groups", might be triple the size at 30 below - and vice versa. Kind of important to know if you are depending on one single "cold bore" shot.
 
Potashminer said:
Sort of goes to what you think is "sensitivity" - I think that chart, for example, says RL 15 will change your muzzle velocity by 1.52 fps per degree F in temperature change; whereas N140 will change 0.4 fps per degree F in temperature change. I think most will find that their groups will impact lower, at distance, with slower muzzle velocity - is as likely that the barrel may throw the bullet left/right/up/down as the speed goes up or down. So what you get at 60 F as "good groups", might be triple the size at 30 below - and vice versa. Kind of important to know if you are depending on one single "cold bore" shot.
Click to expand...
Thanks!
 
I know that not all Hodgdon powders were insensitive to temperature. They actually listed those that were temperature stable.
Sorry cannot recall a specific example at the moment; H4350 and Varget perhaps?. If memory serves, they were "extreme" powders???
I do recall some mention about the newer IMR Enduron powders also being temperature stable.
 
Too use two of the common, medium to slow powders in burn rate.

Imr 4350--h4350-- imr4831--h4831 fastest to slowest

Since Hodgedon now owns a bunch of powders, including imr, I would be interested in:

Knowing if it's still possible to differentiate between H and imr.

Does imr still exist or is there now a "universal" 4350, 4831, etc, etc speed for powders
 
IMR 4350 and IMR4831 still exist and I believe they are made in Canada and that H-4350 and H-4831 are made in Australia by ADI.
 
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