Shooting match bullets or big game is hit or miss. I have seen match bullets act like armor-piercing and go straight through without even opening up, I seen them blow up within the first two inches of penetration. That said you have to pick your shots when using match bullets like the 123s, I use them out of my 6.5 Creedmoor and I shoot for the head. They kill just fine, but of course any bullet well when you shoot a deer in the head. And some guys on here will say shooting deer in the head is unethical but when you're using a bullet that doesn't perform well on large game you have to take the best possible kill shot. I wouldn't want to shoot a deer in the shoulders with the 123 or even the lungs as it could go through just like an arrow with no damage at all, pick your shot you'll be fine.
