About five years ago, a friend of mine got rid of some stuff, and gave me a cannister of IMR4227. The only loading I was doing at the time was BP into .32-20s, but I decided to try some "modern loads". I found data that listed 13.0 gr of IMR4227 as a load for 100JHP bullets--which I also purchased; some Speer, some Hornady. I used the load, and it worked very well.
I'm getting back to reloading, but can't find any current listings for the IMR4227 in .32-20. I've heard that you have to stay current on such things, as powders can be altered by the companies while maintaining the number/name. Has something changed with 4227, or should I still be safe with my load? (I purchased this new powder a couple weeks ago.) BTW, the gun is modern---eight years old---and in good condition. Was only loading BP for fun, not because it was an old gun.
Just wanted to make sure.
Thanks,
Hugh