A VERY good home-made lube for black powder bullet loads, is 60% BW 40% Vaseline. It is a wonderful lube and works every bit as well as
SPG and Lyman's Black Powder Gold which are very good also in commercial lubes.
Shooting bullets does require different and specialized equipment, if you don't already have such stuff.
When I was shooting bullets, I cut a section of barrel off and made a swage out of it, so using my loading press, I pushed bullets through it to
engrave grooves on the bullets after lubing. Thus these "mechanically fitted" bullets shot VERY well indeed. I used double aperture sights as those
were what I was using in modern gun competitions.