I switched my rcbs hand primer over to small rifle primers and it wants to turn about every other one onto its side. Is this something I can fix or should I contact RCBS and order a new plastic guide?
You should have two guides, I think one is white and one is black and they are marked on the side L or S. If you are using the correct S guide and it’s happening yes you should contact RCBS.
Those plastic inserts wear out too, may replace if you think that may be the issue. Sometimes I get up to 3 primers in the chamber from being a spastic.