Looks like 30/06 or .308 hard to tell due to the distortion of the pic. I don't think we need much more speculation, given it is called a 1311 ... <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />
we can get it pretty close using the JYD coin for comparison its about 7 and 3/4 coins in length.