Its really not the replacing primers or their cost, I just made a mock order on midway and I could replace everything except the WLRM for around $275 in one order with CCI's. Its not exactly small change, but I could do it. Its more that WLR's have been my standard primer for 15 years and I have maybe 20 rifles with at least a load each, some with 2 or 3, that would need to switch primers in and refire to confirm. What a PITA.
