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They shoot much closer to mil spec ammo than the 150 stuff. And seem to kill goats just fine
If I had a .303 that was only a hunting rifle is would use the 150gn stuff.

I use highland brass(I buy 180gn sp-then reload)
Fedeal primers
38.5gn 2208
174gn hornady fmj pill

This is for service rifle, not hunting. When I have in recent years hunted with a 303 I have...