I am buying a fnh spr as rifle i need a good scope for it the price i am looking at spending is about $500. Is SPRINGFIELD AND ARMORY very good scopes. And at what size of scope 3 x 12 42mm or what else. I am new at this so any help I would really appricated it. And the cal. of the gun is 300wsm. The purpose of the gun compition and hunting.