Thanks folks for the information that everyone took time to provide!
The IMR powder from Hi-Tech doesn`t look bad on pricing. Hadn`t considered it before now. Looks to be a very viable option. It is good to see that others are using it also.
The H50BMG powder from Hodgdon was something I had been mulling over for awhile. Seems that quite a few people are using it with the AMAX projectiles. Have a few here I would like to try out to see what they will do. Also have a few of the regular ball I would like to load up to plink with. Not resistant to the idea of using 2 powders to handle the different projectiles. The US869 powder was looked at. Curious to see what kind of performer it is.
Have a friend who is getting good results with the WC860 powder in several different bullet variations. Only problem is, trying to find it nowadays and not having to worry about it being a pull down powder.
Are any of you working at or near compressed loads with the ingredients that you suggested?
As far as the 20mm piece is concerned, I think that may be a little much on ones` poor shoulder to handle!