IMR4227

Discussions covering the components and techniques of reloading for your long gun.
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Macd
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Re: IMR4227

Post by Macd »

Thanks, got it.
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Re: IMR4227

Post by Ranch Dog »

You're welcome!
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Re: IMR4227

Post by Macd »

Great article Mike. I found it interesting they had a number of over SAAMI loads for the Rem. 760, 600 and Win. 70 rifles. Comparing the top load from the article and the top load from the Hodgdon manual for a 200 grain bullet over H335 shows an muzzle energy increase from 1,863 to 2,548 ft. lbs. The trajectory improves with a drop of about 6 vs. 10 inches at 200 yards (sighted at 100) and the energy level is still at 1,489 ft. lbs. Substitute the Interlock SP for the RN and the retained energy at 200 goes up to 1,718 ft. lbs. Those are really decent stats for a big bullet.
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Re: IMR4227

Post by Ranch Dog »

loaddata.com and Wolfe publishing has been a great resource. Any load you look up has the magazine reference so you can go to it or order the magazine.
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Re: IMR4227

Post by Ohio3Wheels »

I just picked up the 4th edition Lyman Cast Bullet Handbook and in a quick read through notice they listed IMR-4227 for the 7,62x39, the 7.62x54R and the 303 but not the 8mm. With some listed mold numbers it was shown as the most accurate.

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Curt.......makin' smoke and raising my carbon foot print one cartridge at a time +guns +guns
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Re: IMR4227

Post by Ranch Dog »

How about that. In QuickLoad with my bullet and the 7.62x39, it shows performance similar to H322 with about 10% less case fill and about 1K more pressure. I guess if I get bored...
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Re: IMR4227

Post by Macd »

The 8mm Mauser loads were a wash. No more paper patched jacketed experiments for me :cry: .

The Rem 760 loads in 35 Rem with 205 grain lead RNFP checked bullets were a mixed bag. All loads were with CCI250 (LRMag) except I duplicated the 24 grain load with CCI200 (LR) primers for comparison. OAL2.40. Case fills were from 50% (20.0 grains) to 70% (24.0 grains) in once fired neck sized Remington brass trimmed to 1.908. The bullet was seated with the gas check even with the top of the shoulder and a light crimp applied. Four rounds for each load. Powder trickled up to just tip over the electronic scale to the correct charge.

GRNS MIN MAX SPREAD AVG SD QL FPS QL PSI
20 1,511 1,577 66 1,538 32 1,591 17,765
21 1,485 1,654 169 1,578 79 1,657 19,516
22 1,744 1,777 33 1,762 17 1,722 21,423
23 1,724 1,845 121 1,801 55 1,787 23,492
24 1,846 1,940 94 1,893 39 1,851 25,735
*24 1,841 1,917 76 1,880 41 1,851 25,735
* CCI200

Sorry for the squished table.
- Except for the 22 grain charge the powder gave poor consistency with respect to velocity. This may be related to the low fill volumes and the varying powder position in the case.
- Accuracy was between 2 and 4.5 inches max spread at 50 yards with the best load 24.0 with the CCI200 primers. Some of this inaccuracy I am sure is related to using a rifle rest with the pump action 760. There is too much movement in the sliding forestock to get a solid rest and supporting the forestock with my hand was an awkward reach. I kept using the rest as I didn't want to change part way through the experiment.
- QuickLoad did a pretty good job predicting velocity and I am confident all pressures were pretty close to those predicted. The 35 Remington has a CIP MAP of 39,885 PSI so it should be okay to go up to as high as 27.0 grains for a 80% fill. QL predicts 33,618 PSI for that charge. I am going to load some up to this level and see what happens.

My testing of pistol bullets will be reported in the thread on that subject.
https://lee-loader.com/viewtopic.php?f= ... 2&start=10
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Re: IMR4227

Post by horseman »

Admittedly I have absolutely no experience using 4227 (IMR or H4227) in rifle use. I have used 2400 in a couple instances with decent results for "lower power" loads. (except for the 45-70, a max load of 30gr. under a 405gr lead bullet will give you such a b!t@h slap up along side the head, and you better be clean shaven to boot :o Or do not take a good check weld....BUT, I have used a lot of H4227 in 45 colt and the load I use is 20gr under a 260gr RNFP lead bullet. Very accurate and not unpleasant to shoot. I would surmise it's somewhere in the 18gr. 2400 load area in that application. The "original" H4227 was a dirty powder to shoot, it has some yellowy stuff in it to look at and when fired it leaves a bit of "residual" behind. A lot of folks think this is unburned powder but it's actually a filler that's in the powder (yellowy stuff). Just wipes out. I'm not going to go into the "changes" that were made in H4227 vs IMR 4227 because it got a bit complicated, but suffice to say that the last I heard/read there is only IMR4227 and it's actually H4227. :?: If I remember correctly H4227 was Australian made and IMR was Canadian. I said I wasn't going to get into it and I did it anyway :roll: jeez. +zzz
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Re: IMR4227

Post by Macd »

My IMR4227 is Canadian made by General Dynamics in Quebec, It goes to the US for packaging. I can buy it in bulk from a place called Higginson's powders in Ontario. I believe he buys direct from Hodgdon. After reading the many conflicting posts on the IMR vs H discussion I used IMR reloading tables.
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Re: IMR4227

Post by Ranch Dog »

In the US Hodgdon stopped canning the H4227 when it purchased IMR. I've always wondered why IMR Trail Boss is listed on the Hodgdon site but you need to go to the IMR site to see the rest of those powders, but IMR Trail Boss is not listed there? So kind of corporate technicality I suspect.
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