I started a small collection of 1/10 ounce silver coins mostly just bullion rounds because I like how they look with so much detail on them. The problem is that I thought my walking Liberty one was the size of a penny. However I tried a a penny airtight and it was minusclely too small. Should I purchase like a nickel size one for it or should I try a few more of my cent ones that I ownto see if that one was slightly out of spec?