ar2208 powder is probly the best powder for 308 in my opinion
go for some good quality 150-170gn bullets
use federal or cci primers the Winchester ones have a tendency to fail damaging the rifle
for the 303 you can buy cast bullets very cheap on trademe if you want to go down that route just keep in mind that you will need to keep them under 2000fps
.303 Cast Bullets 212 grain | Trade Me
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