174gr flat base was the standard since before WW1. 200~215gr will be round nose and will have a job getting to 600yds as they so drop fast, but carry a huge punch close in apparently.
Also, I have used 150gr 308w hornady FMJs on the target range with good success, it depends on if you have a good barrel or not. The thing is with the 303 is having a flat base that seals the grooves well.
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