Will depend on the gun, caliber, projectile etc...
I found 90gr of 3f to shoot a prb accurately in my 50cal....same gun i found 70gr and a Buffalo ball-et shoots accurately and same point of impact as prbs do....killed my last 2 does and a buck with the ball-et load..hits em hard..
Most old timers use 70 grains in a 45 or 50, a little more in a 54 or 58. The old timer trick of holding the ball in your palm and pouring the powder over until it " Volcanoes", ( covers in the shape of a cone ) actually comes out between 70 and 80 grains. They must have known a thing or two!
I use 80 grains of 2fg in my 50;s the 54 and the 58 caliber. I have never used the 62 rifle for hunting, but for bench target shooting, I use 100 grains. My 45 match rifle gets a strict diet of 50 grains of 3fg. the 52 squirrel rifle gets a 38 Special case of 3fg.
Reminds me, I'll have to start shooting lighter in my older age this year. Besides, I can see the need in saving a can of powder for some more shooting at the range. My old TC carried me through some heavy shooting.