I'm interested in the Big Shot glove. I usually wear a medium. Do their sizes run true. For example, some companies medium run small & are too tight.

I would say that they do.  I wear a large and have no problems with them.

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The "medium" I had fit like most other mediums.

Me too.  I wear a large.  Have three of them now and they all fit well.

Love mine, I wear a medium size glove, was a little tight at first but formed to my fingers in no time

I ordered a large (based on what I wear for winter gloves etc.) just a little too big so I put some leather spacers in the fingers and it worked fine. Ordered a Med and I thought it might be too small but it stretched out a little and fits well.

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Mine fit good.

they are true to fit for me, I wear a medium. Being leather it will stretch when wet and shrink when dry. The quality is like Filson's and takes a while to break in.