Home Forums Hunting & Shooting Ask The Gunwriters Loading 284 Win with IMR 4451

Hi, I have a 284 Win in a 99 Savage (1964) and would like to use IMR 4451 with Speer 145 gr bullets. The copper fouling reduction of the powder plus Dyna-Tek bore coat should make cleaning much simpler. Any suggestions will be helpful.
Thanks.

Use IMR-4350 or H-4350 data as a starting point. It pretty much dupes those two.

I shoot the same rifle and bullet but use 4831 SC with great results.

I use R17 with 140 B tip

I load a 120 Barnes with 53 grains of H 4350. Pig killing SOB, deer too

I haven't even seen that powder on the shelves, but I would be interested in yours or anyone else's results. My .284 is a Winchester Mod 88

I've probably tried IMR4451 in a dozen cartridges where H4350 was used in my standard load for those rifles. In every instance IMR4451 equaled the H4350 load's accuracy, and sometimes beat it a little--and often got higher velocity as well, since it's a double-based powder and H4350 is single-based.

Might also mention that's partly why I have more 4451 in my powder stash than H4350. Have also run my standard temperature tests with it, from zero up to around 85 degrees and it passed. (Have yet to test any powder at temps above about 85 that doesn't gain velocity, and obviously pressure, but temp-stable powders don't gain nearly as much.)

I had a 284 in a Winchester 100. The only reason I traded it off was I hated chasing expensive brass. The 284 is close to the 280 in power and I’ve had a few 280’s. I developed my loads with IMR4350, then H4350 and now I’ve been testing IMR 4451 loads. I have not done the temperature tests that MD has regarding temperature. But I have not seen a much difference regarding accuracy. I have an 8 pounder of IMR4350 so I’ll probably keep shooting it for some rifles, but I’ll be replacing it with IMR4451. After Dyna-bore coating the 280’s I have not seen any issues with difficulty cleaning the bores. The main issue is temperature sensitivity and I’ll take MD’s recommendation on that.

Bugger,

During a previous "shortage" of powders, especially the Hodgdon Extremes, one of the major guys from Hodgdon (since retired) told me that decided to have similar powders made in Canada due to ADI (the Australian company that makes the Extremes) trying to raise prices substantially.

The Quebec plant that had been making standard IMR powders for a while said they could make similar temp-resistant powders, and obviously the shipping costs would be far lower. And they did.

While my results with 4451 have been perhaps the best, have also had great results with other Enduron IMR powders from 4166 to 8133.

Thanks for the info. Now to find IMR 4451.