A few years back I bought a Marlin 336 in 30-30 Winchester.
I used 2 different bullets and loads.
one is a hardcast 150gn round nose flat point gas check which I loaded 9.4gn of Unique powder, very accurate for plinking target fun and close foxing round chicken pens. Delivering about 1200fps
The 2nd load was a Sierra 150gn Jacketed soft flat point bullet loaded with Varget
When the dictatorship eu banned Varget I had to search for a new load, Varget just seemed to be a nice do-it-all powder.
I purchased a tub IMR 4166 Enduron as was marked as being close to Varget, In 223Rem it is as good if not better. The copper fouling is reduced too. I loaded up some 30-30Win with it and was pleased with the results, about 1 1/2 inch group at 100 yards using the Sierra bullet.
As a regular reader on gun forums to see what others use, the Hornaday 150gn round nose soft point bullet is popular choice, so as I needed some bullets this time round I bought these instead.
Using the Hogdon load data of IMR 4166 these bullets deliver an average of 55fps faster than the Sierra bullet with the same load.
I have been converted to Hornaday 150gn round nose interlock bullet in the 30-30
Mike
They are devastating on fox at the distances I use them for which is between 50 and 100 yards