Rifle vs handgun brass isn't the issue. Bottle necked brass vs straight walled is. Of course, tapered brass like 300 carbine needs to be trimmed just like all bottle necked brass. Trimming isn't just about precision. It is also about SAFETY. Anyone who thinks it is not worth trimming bottle necked handgun brass because they can't shoot 1moa with the handgun is a danger to themself and everyone around them. There are plenty of handguns chambered in bottle necked cartridges which could blow up in the shooter's face if the brass is out of spec.
NRA Certified Pistol, Rifle, Shotgun and Metallic Cartridge Reloading Instructor
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Offering low cost private basic shooting and reloading classes for calgunners.