That is some really great powder for lead and I also liked
Nitro 100 for my 12 Ga. trap loads.

Only problem the bottles got less powder over the years and the price keep getting higher.

I finally moved on to another brand of powder.

It also sounds like your weapon might like .358 dia. lead bullets.
My M19 liked the soft Speer 158gr in RN or swc styles.

Good shooting.