remington percussion caps became unavailable here about a year ago. Non of the distributors carry them anymore. They have been gone from the remington catalog for about that long. Midway listed them as "Out of Stock No Backorder for a long time but then dropped them altogether. Grafs no longer has them. Apparently Bass Pro and cabelas still has a remnant.
I had ignition problems with CCI even when I hammer seated them fairly heavily. I finally got good ignition by dowell seating them with very great pressure. I only do this when I'm alone on a range with the gun pointed in a safe direction.