Welsh,
.303 is the British rimmed case of WW2 fame for the Lee Enfields and BREN guns.
I think you mean .30 cartridges and there are many that have that bullet diameter and vary widely on case length and capacity.
I think you are going for 7.62 NATO as your cartridge? A .30 on a battle rifle capacity brass casing being 7.62x51mm vs 30.06 a .30 on a larger capacity case the 7.62x63mm
I can see the reasoning for a .30 caliber battle rifle. .30 was the smallest caliber deemed possible by the U.S. Army Ordnance department that could still drop a charging horse pre-WW1.
Shoots through 30 inches of pine boards, etc.
Having a precise rifle paired with good ammo and a good scope is great but, the reality is that not everyone gets to be a sniper shooting without being detected.
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