Each rifle is going to like what it likes and they are not all created equal. If you are palnning to only shoot factory ammo you are going to have to try various brands and bullet weights to see what
your M527 prefers.
I recently purchased a CZ 427 in 204 Ruger and it doesnt shoot Hornady factory to my expectations so I handload for it and get the results I wanted doing so. I have had good accuracy with HSM, Ultra Max and Black Hills 223 re-manufactured ammo. It's a little cheaper than the others that come 20 to a box. I have not tried it but Winchester makes a ecconomy/varmint load that comes 50 to a box.
It's just one of thoses things with shooting you are going to have to try different loads, what works for me might not work for you and so on. One other point also is that the most exspensive ammo doesnt always mean that it shoots the best.
Ok, go on now, ya have some experimenting to do

