imr4198

[rmclaughlin]

After looking at the load info I bought some imr 4198.I could not find any Hodgkins.Will the fps listed on the info sheet be close to the same for each powder? I am thinking about 55 grains of IMR4198 with blue Harvestor sabots ,195 expanders.Should this make a good 45cal load? If it ever stops raining for a day i am ready to shoot .

[hunter]

I beleive that imr 4198 is a little hotter than h4198.
i would use 2 grains less of the imr4198 compared to h4198.

[Richard]

I would beg to differ with Hunter. I have always found HODGEDON's 4198 to be hotter than IMR's version. I just shot 62 gr. of H-4198 with a 155 gr. bullet and only got 2350 fps. If you go back into some of my loads, I did a comparrison some time back and H was hotter than IMR. There is enough infomation in the loads section with H-4198 that you should be able to do a comparrison.
Richard

[Deleted]

Richard is correct, If I remember correctly I had to use approx 2 grains more Imr to get the same speeds as H

[hunter]

I stand corrected. Thanks for keeping me straight. I knew one was a little hotter than the other. I got them backwards.

[tar12]

I did not chrono this load but shot it enough to know it is repeatable and accurate.

[edge]

IMR 4198 is a bit bulkier than H4198 and produces a bit less pressure and velocity.

60 grains of H4198 takes up about 69.3 grains of H2O and IMR 4198 takes up about 72.6

edge.

[rmclaughlin]

Thanks to all for your help.

[chuck41]

Some of us have found it is a bit harder to ignite than the "H" variety. I had several failures to ignite with my 50 using the "IMR" variety. Not sure whether this post is about 50 or 45. Probably not a problem with the faster pressure building of the 45.

In my case the primer would "pop" and the unburned granules of the powder would be left as a waxy looking residue, almost intact but with the dark coating on the outside burned off. Bullet would hit the ground about 20 - 30 yards away.

[edge]

Apr 28, 2011 11:06:21 GMT -5 chuck41 said:

SNIP.

Bullet would hit the ground about 20 - 30 yards away.

You generally look for short range loads but that seems a bit extreme even for you ;D ;D

edge.

[rmclaughlin]

Tar 12 what was the bullet/sabot combo (nice group)

[tar12]

Apr 28, 2011 13:27:02 GMT -5 rmclaughlin said:

Tar 12 what was the bullet/sabot combo (nice group)

.40 cal barnes 195,blue harvester,Fed 209A primer

[herman]

Just tried 65 grs of IMR 4198 back in march to compare with 64 grs of H,and got pretty close to the same speed with one grain more of IMR than H.
200sst gave 2795,2790and 2779 for avg of 2788fps useing the IMR at 65 grs.
The ES was pretty low also at 16/8.3
At 100 yds they both shot the same also.

[chuck41]

Apr 28, 2011 11:30:07 GMT -5 edge said:

Apr 28, 2011 11:06:21 GMT -5 chuck41 said:

SNIP.

Bullet would hit the ground about 20 - 30 yards away.

You generally look for short range loads but that seems a bit extreme even for you ;D ;D

edge.

Penetration wasn't very good either. Only about 1/8" of dirt. But can't complain about accuracy, it hit that dirt every time.

[rossman40]

You have to remember where Hodgdon started from. Bruce Hodgdon bought and resold "surplus" powders which were sold from war reserves or lots that didn't make the grade. It wasn't till the late 60s early 70s that he had to buy "new" powders. And then when he took samples to have anaylized it was old powder so that is why the burn rates do not match exactly. I have heard stories of Bruce mixing powders on a tarp in a garage to get the proper/close to burn rate. The only powder Hodgdon actually makes is the BP subs.

You also have to remember that the IMR powders were a standard of the military around the free world and DuPont's factories in the US, Canada, Australia and I think Brazil and S. Africa cranked them out till the switch to ball powders in WWII. Not to mention the mysterious ties with the European powder companies. Now the only plants left from the DuPont dynasty is the Valleyfield, Canada plant owned by General Dynamics, Australian Defense Industries, now owned by Thales. If you want ball powder the only plant left in the US is the St. Marks plant in Florida which is also owned by General Dynamics. Alliant Powders in Radford, Virgina is the only other powder plant left in North America. Supposedly the Black Mag powders were made at a General Dynamics plant in Moses Lake, WA that makes specialized stuff like rocket propellant and air bag components.

Even the Western Powders (Accurate, Blackhorn 209 and Ramshot) are made in one of the 3 North American plants or Europe. Some of the Alliant powders are made by Norma/Bofors in Sweden.

[Jon]

Rossman. Very informative. Thank you.