Any flake pistol/shotgun powder can be used safely in bottle neck rifle cartridges for light loads. Just be dead sure to take EVERY precaution in the book that you don't get a double charge. This applies to magnum revolvers also. I bulged and split the cylinder of a 44 Ruger BH by double charging with a max load of bullseye. Because I was blabbing to my brother who had stopped by in a very rare visit. He saw me drop two charges in the cast but knew nothing of what I was doing. After the explosion, when I was trying to figgure out what went wrong, he told me!
I prefer to spend a bit more money on more buliky powders and never use a charge which can be doubled in what ever case I am reloading. That is the shurest safety there is against double charging.
A word about current powder prices, vs old prices. I stated that I bought surplus 4831 for $2 per pound, and that was back in the very early 60's. I was a skilled worker making upper end blue collor wages, which was $2.10 per hour. And it was cheap surplus powder, equal in quality to what was sold in factory cans, but cheaper because it was surplus. New factory cans were, as I recall, somewhere around $5 per pound. Over two hours work. In other words,I was paying an hours work for a pound of surplus powder, to save paying two hours labor for cannister powder. So much for the 'good ol days' story. Inflation is what is causing the price increases more than anything. It has often been called the silent robber. Had I saved all my earnings back then, until now, with maybe a 1% interest on the savings, I would be having to put about 20 hours of my 1960's labor into a pound of powder! Today, a good craftsman drawing normal wages can purchase a pound of powder for two hours work.
Inflation was just taking off back when I was young. I distinctly remember my Dad, a dairy farmer, working 12-14 hours a day as a hoddy for a cement block mason, because he needed the money so bad he was willing to do his milting and farming at night after playing hod all day. The awsome wages he was drawing was $2 per day! And He fed his wife and 5 kids with it!
We are on our way downhill at avalance speed. Stock up on the things you want and belive you'll need while the prices are so good, --- and at least as importantly, while they are available.
