They are designed only for the use of .50 Beowulf. We are not responsible for the use of any calibers by our customers.
If you decide to use it with 6.8mm SPC or .223 or 7.62X39 and you have feeding problems, in this case, we are not responsible. We are just stating what the manufacturing is telling us. Here is some FAQ for you.
http://www.alexanderarms.com/index.p...duct-faqs.html