Shipping MLs via USPS
I have my complaints about the Post Office (long slow lines in my area), but I sure can't complain about this.
Over the last few months I shipped 4 muzzle loaders to various parts of the country using regular Parcel Post with insurance. Every one arrived in good shape with average travel time around six days and average cost (with insurance) around $20.
It was a lot less hassle and cheaper than the last time I used UPS about a year ago.