I have used the principle reloaders use with the reloading hammer. Find a tube the right ID to support the rim ( or one close- wrap the rimmed case with coat hangars to fill the gap) and extends just beyond the length.... slide the round in, then drop it on the nose end once or twice, the weight of the projectile and sudden deceleration pops the projectile out quickly and cleanly. I have reversed the process to install projectiles. I put the casing outside in 25 degree weather overnight. (cooled it), then heated up the casing neck with a 400 degree heat gun, place the ice cold projectile into the neck and dropped it a few inches on the head onto cardboard....had to do that to a new, unfired, lacquered steel case 90 mm, the results were amazing. I also recently did that to a few 40mm Bofors rounds. Pictured is a bullet puller, use the same principle. I recently pulled a few for a member here, the military bullet was crimped in, and had black sealant, it popped right out.