I've had great luck with 30mm aluminum TPS TSR low rings on all my non-magnum rifles. With EGW picatinny rails and the low rings I have been able to clear 50mm objectives with no problems at all. I would definitely think the high and extra high rings would make it difficult to get a solid check weld (without the addition of a large comb riser).

http://www.midwayusa.com/product/298...le-rings-matte