I agree with Charlie. Cheap ammo is a way to learn shooting “habits”, but not accuracy potential increase. If you just picked up a press, then it seems you’re serious about reloading. Brass is a non factor in reloading. Might make a difference with handgun, but not bolt action rifle. You’ll understand when you start doing it.

Nothing wrong with 308, but if cost is the reason, just getting the cost back on the barrel swap will take a long time. And eventually, you will want to go with 6.5 or 6mm anyway. Just what we are telling you from some experience in this.