Another 30cal subsonic thread

[Marty Henry]

The difference is partly due to the weight difference and partly due to friction, having to engrave a solid copper jacket with a full length bearing surface as opposed to a grooved lubricated lead bullet even if they were the same weight you would need less powder with the cast bullet to obtain the same velocity.
Apart from being cleaner to handle I never have seen any advantage offered by subsonic jacketed bullets over cast lead especially with a hollow point.