Not the most expensive, but I've had very good luck with Warne rings. I've used most of the other more expensive brands numerous times in the past, but stick with Warne now. I've used them on everything up to a 300 WSM and never experienced any movement even after hundreds of rounds. I only use Ken Ferrell bases on my Savage actions. Can't imagine you're going to "need" 20 MOA bases for 300 meters. Depending on your setup(scope and barrel/action alignment) you may not have enough adjustment on your scope to zero your point of impact at closure ranges(say 100 yards). I ran into that once and had to switch to a 10 MOA base. Good luck with the new rifle.