IMR4227

[Kaiser]

I realize this is an older thread; however, I did find a use for IMR4227 in my .45Colt pistols and rifle. My best load is 18.5gr over a 255gr cast that is still within the pressure range of the 1873 Colt "Replicas". It fills the case better than Unique or Accurate #5 while giving about the same, or better, velocities and comparable accuracy.
Now that Hodgdon markets both 4227 powders, maybe someone on this forum knows if their data and composition are identical? (I suppose IMR4227 could work in big case like the 45/70, similar to IMR4198, where reduced loading makes even big bullets pleasant to shoot on a regular bases!)

[Ohio3Wheels]

<snip>
Now that Hodgdon markets both 4227 powders, maybe someone on this forum knows if their data and composition are identical? (I suppose IMR4227 could work in big case like the 45/70, similar to IMR4198, where reduced loading makes even big bullets pleasant to shoot on a regular bases!)

<end snip>

Looking at the 2020 Hodgdon manual and the 45 Colt they list IMR 4227 for bullet weight below 300 grain and H4227 for 300 grain and up. I was hoping they would have a listing with both to compare the powders. They are a bit different.

Make smoke,

[Macd]

H4227 is no longer offered in the Hodgdon product line. It is also not listed in the latest burn rate chart.

[Ranch Dog]

We have an older conversation about it, I've never found a use for the 4 lbs of H4227 I bought. I'm blowing out the barrel of a 38 Spl revolver in order to use it up. It's taking forever.

I original had bought it for my 375 Win. Hodgdon's annual had some loads listed using it, but following their recipe, I experienced over pressure events and lower velocities (I have pressure trace equipment and a strain gauge on the barrel). I pushed the powder to the back of the shelf.

Last year, I found some old H4227 data for the powder for the 35 Rem. I tried it in my Rem 600, scary as well. Starting 10% low of the max, I had cases that had near head separation. Same as the 375 Win.