First I already know I am rotten with clays. Have not tried it for 23 years. I bought an 870 police SG for a class I am taking in a few months. In addition to slugs and 00 I need to be able to shoot at some clays. It has rifle sights. I do great with the 00 and slugs but missed 24 of 25 clays hand thrown today. It has an 18 inch barrel. Any hints that will help me out? Will a mechanical thrower be better for learning. BTW I was using 2 3/4 #8 shot. I don't know if it is too tight a pattern or just me...I am leaning toward ME. Help.