If you have some IMR4198 or plan to use some in that 30-30 barrel, I would also suggest trying it in the .223, I was doing some load testing for my 15" .223 barrel and tried Varget, IMR4198, & IMR 4895. The barrel really liked the 4198 with a 100 yrd. group of .352", it almost stacked them on top of each other, and it was a middle of the road load by the speer #14 manual. I too was using Horn. Vmax 50gr. bullets.
Gary