With me, its varied reasons.
Pistols & revolvers, its cheaper and seems to me more accurate.
Rifles: I use to cast for the M1A so I could practice in an indoor range on 50 ft SM targets in the winter.
To save time and money, I can practice on reduced target at 100 yards for compition.
I can shoot reduce loads in my heavy rifles without getting beat up. Try compairing a 95 grns of 4831 pushing a 400 grn 416 rigby vs. a cast 416 bullet pushed by Trailboss, One hurts and one is a pleasure to shoot.
I built my grandson a 308, to get him to learn to shoot instead of flinch, I load him up cast bullets pushed by trailboss at reduced targets at 25 yards.
In BPCR,...............well you are just suppose to shoot cast bullets, its the law.
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071