Yeah mate, it's a sporterised 303.
You're half right, the military rounds for them were designed to go through people and do a lot of damage on the way through(FMJ), but you'd have to be a bit silly to use mil surp rounds for hunting game.
There is an abundance of civilian hunting ammo available for them off the shelf from all the major manufacturers with hunting projectiles that mushroom up nicely and hang onto a lot of weight. Remington corelokts and winchester SuperX spring to mind straight away.
I make up handloads for mine using Hornady projectiles.




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