Brass is a DIY effort at the present moment as Remington brass is not yet available in Canada yet. Hornady makes it and it is available, however, it's pricey!
As far as bullet choice goes, the vast selection of .30 cal. bullets are just a Visa card away from placing an order. From 110gr. Hornady V-MAX to 200gr. Lapua subsonic bullets, you're well covered there.
If in-expensive plinking rounds are your thing, 150gr. FMJ bulk bullets are as common as it gets. Cheap reasonably accurate ammo is easily made. With the right load, you should somewhere close to 1-1.5 MOA for 5-shot groups.