With my Trail Boss, and Bull's Eye loads in .38 spcl I have been using small rifle primers. I do not have a chrono so I do not know about the numbers. They feel the same, they group the same, and the POA, and POI match up. No signs of pressure have shown in the loads I have used, and all have gone bang every time. I use them due to the fact that I have so many of them, and it makes buying primers easier.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.