is H- preferable over IMR- ?
- Thread starter buggz
- Start date
I found that H4350 gave me better groups than imr4350. Even after adjusting the imr4350 for velocity. In my Garand imr4895 requires 2 more grains than H4895 to cycle the action reliably. They are close but not the same
David
David
Anybody know how sensitive imr4350 is? Like fps per degree F?
I got 8lbs ordered to replace the h4350 I've been running low on.
I got 8lbs ordered to replace the h4350 I've been running low on.
Another consideration is imr4166 for h4895. It is close to varget and h4895. And also imr4451 for H4350. These 2 imr powders are temp stable and have copper remover added. I have tested the imr4451 in my 6x47L and found it was virtually identical in grains for load and velocity.
David
David
Let your rifle tell you, use whichever delivers better results. To get best results you will in most cases need to develop loads for each powder separately.
In case of a toss up I would go with Hogdon powders their extreme line is probably less temp. sensitive than the IMR powders.
In case of a toss up I would go with Hogdon powders their extreme line is probably less temp. sensitive than the IMR powders.
Same day, shots taken 15 minutes between the first 3 shot group and the next. MagnetoSpeed.
59gr of IMR 4350 = 2521 fps ----- 59gr of H4350 = 2622
338 Sherman Short
205gr Hammer, ADG brass, Fed210M, 58 degrees fahrenheit, 60% H, Baro: 29.87. Wind 12mph gusting to 14.
First time I've used either powder in this cartridge, I don't feel more testing is needed since other powders perform better
59gr of IMR 4350 = 2521 fps ----- 59gr of H4350 = 2622
338 Sherman Short
205gr Hammer, ADG brass, Fed210M, 58 degrees fahrenheit, 60% H, Baro: 29.87. Wind 12mph gusting to 14.
First time I've used either powder in this cartridge, I don't feel more testing is needed since other powders perform better
Awesome. With my math, at 100°f swing from winter to summer. At 1k yards I'm seeing 15" vertical change with hodgdon and 26" swing with IMR. Either way you'd have to correct for it and it's not as dramatic as others have alluded to. This is with my current 6.5 creedmoor load.
Thanks for the info.
H4895 gives me approx. 60 fps more velocity than IMR4895 in my .308 with a 155 grain bullet. As mentioned the H4895 is more temp. stable than the IMR 4895 also.
Actually Varget and IMR 4064 are pretty much the same. The primary difference is density. Varget has a somewhat higher bulk density and allows more case fill. Give Varget an advantage in smaller cases like 223.
I've tested both, in 2 of my barrels, at 100° and 25°. H4350 showed 25 fps diff and imr4350 was 75fps.
Sorry about that, lol. 6.5creed with lapua brass, cci450, and 140 eldm. Powder charges were different between each powder and each barrel. I found same velocity, between the powders had same accuracy, just used different amounts to achieve it.
That was the same experience I had with the 4895s in a 6ARC. Took 2 more grains ,which barely fit, to get the same speed and relative accuracy as H4895. I say that because I'm a consistent MOA shooter, but not a quarter minute guy like most here.
I can't speak for temp performance though, have not messed with it in colder temps.
I'd love to see SW thrown into the mix.. really we have a lot of decent options when powder is scarce.
IMR 4350 is a tad more sensitive than the H, however you also get an extra 100 fps or so from the IMR. IMR 4350 is actually less sensitive than about 2/3 of all the powders out there so it doesn’t bother me.
