4227
We went through a pretty good lesson in 4227 a few years back when we used it in our 30PPC's. Here is what we learned.
Hogdon and IMR merged a while back. Hogdon decided to market some powders only with the IMR Label.
We had a couple of older cans of true H-4227, and it shot VERY well in the 30 PPC. We then found that the H-4227 was no longer available, but instead there was IMR 4227 that had "manufactured in Canada" on the label. This powder came in a typical Hodgdon black bottle.
It proved to be at least 2.5 grns slower than the originol H-4227, and did not seem to shoot as well. Then, the IMR-4227, in the same black bottles, showed up with "manufactured in Australia" on the label. This proved to be almost identicle to the originol H-4227 that we had in the beginning. That is what is available now.
However, this stuff shoots great in a 30PPC untill the temperature goes into the mid 90's. Then, you have to be VERY carefull. Let's just say that if you go a couple of tenths over, you will not need a decapping tool.
Vic Smith, who still shoots his 30PPC very well, had enough of the Canadian and Australian to mix 50-50. I must say, it shoots quite well.
As of this time, all 4227 is IMR, made in Australia.............jackie