Had this exact same question the other day and was discussing it with my brother, have a MDT chassis on my coyote gun, wondered if I had to block a mag to 5 shots or not, not pin as only for hunting so was going to use a wood or plastic spacer of sort to limit the mag as always thought it was 5 rounds max for hunting in a center fire rifle, but could not find it in black and white anywhere. In the past have never used a gun that held more than 5 so never put any thought to it.
As mentioned is this just something that people always thought was true but is not? I also thought it use to be listed in the synopsis at one time but again could be wrong. In all honesty highly doubt I'll need 10 rounds in the mag and usually even if target shooting with it only load 5 to do a group but don't want to be sitting there arguing with some game warden who also thinks 5 rounds is the limit even though no such law exists. Would be nice to have something in black and white from the proper authorities on the subject.