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I am using Sierra Matchking - they are FMJ's. I obtain then for my local reloading supplier - Dante in Montreal - but many gunshop around the country can get them. If you are thinking cheap FMJ - military bullet - then those Sierra's might not fit the bill since they are expensive.
Nearly every manufacturer makes an .308" FMJ. Hornady, for example makes a 150 grain BTFMJ. So does Speer, Sierra, Remington, et al.
Your local gun shop can order them for you and get them fairly quickly if their supplier has them in stock.