A little late on this one, but I wanted to add my experience. I tried using fired brass in my Model 63, but the hammer would not cock & the cylinder would not rotate. The brass was slightly deformed from the firing pin strike and would not fit perfectly in the star. It took a lot of pressure on the ejector rod to get them back out of the cylinder after my experiment.

I looked at several local sporting goods stores, but none carried the .22 lr snap caps. Looked on line and found some for around $12.00 per 24 plus shipping. Then I tried the #4 wall anchors & they fit perfectly for about $0.10 each. They can be used over & over again.

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Inconsistently consistent