IMR-4451

9504 Views 12 Replies 6 Participants Last post by wyogoob, Dec 5, 2016

wyogoob

Discussion Starter · Aug 7, 2015 (Edited)

Anyone using IMR-4451?

I bought a can of it during last winter's powder shortage. It's suppose to be "the same as 4350", but with reduced copper fouling and temperature sensitivity.....uh...I guess I didn't know IMR-4350 was temperature sensitive.

Finally found some load data and put together some test loads in 7mm-08. Hopefully will try them today.

A web search revealed some are liking it in the 270. I might try that one too.

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wyogoob

Discussion Starter · #2 · Aug 11, 2015 (Edited)

Ran about twenty-five 7mm-08s with IMR4451 powder; one-half 140 gr, one-half 150 gr.

Compares to IMR4350 except it is cleaner, leaves less copper. Just worked the loads up, haven't done any grouping yet.

And naturally there's none of the powder on the shelves anymore. There's way too many different powders anyway.

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GaryFish

· #3 · Aug 11, 2015

Put it in a casing and hang it in the basement for a few weeks. It might get better.

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wyogoob

Discussion Starter · #4 · Aug 11, 2015

GaryFish said:
Put it in a casing and hang it in the basement for a few weeks. It might get better.

Hey thanks, that reminded me I got stuff hanging in the basement. Better go swat some flies.

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wyogoob

Discussion Starter · #5 · Aug 13, 2015 (Edited)

Good news: I got most of the flies kilt in the basement.

LoadData.com has just published more recipes for the new IMR4451 powder. Now there's a total of 304 IMR4451 recipes for 22 different calibers on the reloading website:

22-250, 257 Roberts, 243, 280 A.I., 25-06, 30-06, 300 WSM, 6.5 Creedmore, 6.5-06, 6.5-284, 338 Rem mag, 7mm-08, 7 Rem mag, 270, 243, others....even the 416 Rigby.

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wyogoob

Discussion Starter · #6 · Aug 13, 2015

All but 10, out of the 304 IMR4451 recipes, come from Hodgdon.

https://www.loaddata.com/members/listing.cfm?type=1

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Loke

· #7 · Aug 13, 2015

wyogoob said:
All but 10, out of the 304 IMR4451 recipes, come from Hodgdon.

Stands to reason, Hodgdon is the distributor for IMR, Hodgdon, and Winchester powders.

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wyogoob

Discussion Starter · #8 · Aug 13, 2015

Loke said:
Stands to reason, Hodgdon is the distributor for IMR, Hodgdon, and Winchester powders.

Yep.

I'm waiting for some recipes from gun magazines, long-range shooters, and old half-blind retired guys that like to mess up a bolt face now and then.

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Mtnbeer

· #9 · Aug 14, 2015

Saw some in the store the other day and was half tempted to buy a pound and try it on the ole 257 Bob, but I was already getting some W296 and IMR 7828 SSC for the 44 RM and 264 WM respectively and didn't want to seem too greedy on powder.

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wyogoob

Discussion Starter · #10 · Aug 29, 2015

Shot 12 rounds each of four different calibers today working up some new loads. One rifle with 4831SC, one IMR4350, and two guns loaded with IMR4451. Cleaned all the rifles tonight and the 4451 is noticeably cleaner.

The consistancy and accuracy of the new 4451 powder is looking good in a 25-06 and a 270.

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Huge29

· #11 · Aug 29, 2015

Good to know, that 4350 is one of the more popular powders for several of the 6.5 cartridges, but most guys shooting those only clean them about every 500 rounds, so it would be interesting to see how it does in that use.

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Smoot

· #12 · Oct 5, 2015

Done any more testing with the 4451? Some of my main loads for a couple rifles use IMR 4350 so I'd be interested in comparing the two.

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wyogoob

Discussion Starter · #13 · Dec 5, 2016 (Edited)

Will use 4451 for 25-06 100 gr bullets

Smoot said:
Done any more testing with the 4451? Some of my main loads for a couple rifles use IMR 4350 so I'd be interested in comparing the two.

Shot a few 4451/25-06s in cold weather and they shot OK. Chronograph went haywire so I didn't get a good feel for the fps compared to when I shot these reloads in the summer. Went out this weekend to shoot the gun but got froze out, didn't shoot the 25-06. :?

As far as I can tell the accuracy of the IMR 4451 is as good as the IMR 4350 in my 25-06s and I really like how clean the barrel is with the new Enduron powders. I'm going to switch powder to 4451 for 25-06 with 100 grain bullets.

I'm working on some Enduron powder recipes in 256 Newton. The barrel on the Newton rifle does not have rifling, it is paragonal, has an oval bore, that IMO fouls quicker than a barrel with normal rifling.

More later.

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