I cant find a qualified or consistent answer on this one but, is there a difference between IMR vs H and AA for that matter. If there isn't, why are the published loads different. If this has been rehashed in the past, sorry, but I couldn't locate any threads on it. BsChoy Private Minuteman. Oct 10, 22 0 48 Upstate NY. IMR is slower I believe than H But in any event they are different speeds and are not interchangeable.
I figured the different published loads meant they were not interchangable, but when a local shop was out of IMR and tried to sell my H instead, I was leery.
Ratbert Gunny Sergeant Full Member. Jul 18, 2, 1 44 Concord, NC. So if you get H you'll need to work up a new load but it should also be an appropriate powder for whatever chambering you were using IMR for similar, though not exact, densities and burn rates. Aug 10, 9, 5, AZ. Bear in mind that the published loads on the Hodgdon load site also differ, and Hodgdon owns both brands. The burn rates are close, but loads data can not be interchanged with impunity.
BsChoy, Agreed that loads are not interchangeable but, according to Hodgdon's chart, the three powders stack like this fast to slow : IMR H AA Feb 10, 2, 74 Wyoming. Thanks in advance, Brian. Both are great powders Brian. You are correct in that H is supposed to be a bit more temp stable than IMR It has worked very well for me in all conditions from hot weather to extremely cold, way below zero.
Accubond or Partition This load has worked very well in two rifles I shot them in. Of course work up to this in your rifle. The Hodgdon temp stability thing is way overstated, especially in , but H is a great powder for. So is I; some rifles use both well, while others show a preference for one over the other.
Try H, which was literally developed for the. All of these work great for the. If that's the case then I'd go with the I due to availability. H seems to dry up quicker and come to market later than the IMR. I have used both quite a bit for several s, and both are very useful.
If forced to choose I would pick H, 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 IMR is it's really a safe powder for the , you run out of case capacity before pressure gets too high.
But on a gr bullet they give a max of IMR as 52gr. Why would they use a grain more of H over IMR on the gr bullet, then a grain less on the gr bullet.
Don't you always have to use more slower powder to reach the same pressure as a faster one? Powders will flip-flop on the burn chart depending on the pressure range of the cartridge and or bullet used. You possibly could swap H data for IMR but why chanch it.
Go to Hodgdons web site for data for both and insure you are within publisted data parameters. Grain for grain, they are not the same. Substituting one pwder for another that sounds like the same is a very dangerous practice. There is plenty of data available, much of it free. I'd make you all blush with the loads I changed from I to H Ain't rocket science here, just a little sense I'll go against the tide It is ok to swap loads as long as you are not running about 60k pressure type loads now.
If you are two or three grains under max go ahead and shoot them both and you'll see the results are as similar as trying another batch of I If you said go to the gun store and get a can of I and one of H and put 57 grains under a sierra boattail in a would I be scared poopless to fire the first round
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