I`m just starting to work with this powder to replace my R22 loads because I can find any R22. It`s encouraging that you are having such success with it.
I`m running a max charge of R22 under a 117gr Hornady Innerlock/115NBT @ about 3100 out of a 22" factory Savage barrel. I also have shot a max charge of R22 with 100NBT @ around 3300fps out of it. All of these loads were sub moa and all bullets were moly`d.
A 22' tube is just fine for hunting...