I have used small rifle primer in pistol loads for 4 years. I started at the starting load, and worked up every load. I used 1K small pistol once when I got them in a trade. They worked the same with my loads that were small rifle. Just never use the small pistol for small rifle loads. The rifle primers have a thicker cup to contain the pressure of rifle loads.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.