I will be mounting a Premier Reticles 3-15x 50mm scope (34mm dia.) on my LRB m25 receiver. I note that there are rings offered in 4 and 6 screw configurations. I presume that the 6 screw version would be clearly preferred on the .338 and .50 cal rifles. Does anyone have any data or experience to suggest that either configuration is superior for use on the M1A? Thanks.