40 years ago my Scoutmaster showed us how to use a 0' buckshot over a tiny bit of Bullseye Powder in our 30-06's. They would print pretty close to our full powder jacketed loads out to 25 yards or so. Worked well on Grouse and made for some inexpensive Trigger time.
These days I use a cast bullet like the Lee "Soup Can" or the Lyman 311008 over enough Bullseye or W231 or Red Dot and drive it about 950 fps in my 30 caliber rifles (30-30, 308, 30-06). Quiet, accurate and great on small game. I even use it in silhouette matches for the 50 meter chickens.
https://www.youtube.com/watch?v=zbRsCaLvpEQIf you are an experienced reloader, it is an option. You just need to know where the Point of Impact is compared to your normal hunting load. It is usually pretty close out to 25-50 yards, especially with the iron sights. Scoped rifles tend to print the load lower, depending on your zero.