303, I can tell you from experience a lot more meat will be damaged with that 243 Win than with a 375 H&H with a 300 gr Swift A-Frame! My favorite three cartridges in the world , are the 243 Win, the 375 H&H, and the 500 NE, and as you go up in size, the meat damage goes down. My 243 Win handloads send a 100 gr bullet down range at 3000 FPS, the 375 H&H a 300 gr bullet @ 2500 FPS, and the old 500 with a 570 gr bullet @ 2125 FPS, and as you go up the bullets get tougher! The little 243 Win with the 100 gr bullet @ 3000FPS tears meat to shreds, while you can eat right up to the hole with the 375, or 500NE.

We have a club (DRSS: DOUBLE RIFLE SHOOTER'S SOCIETY) of guys who only hunt with double rifles, and we hunt wild boar most of the time, And I personally use everything from 9.3X74R, to 577 NE to shoot pigs, and I eat them. Hellacious good practice for hunting Cape buffalo, and lion, to boot! Tell your friend, to go ahead with his 375 H&H on hogs, and butcher them for meat, because the damage will be minimal! Good hunting!