The Federal small pistol primers are #100. The only pistol calibers I use small rifle primers in are hot loads in .38 Super, 9x23 Winchester and .400 Cor-Bon brass with the small primer pocket.
If your handgun will ignite them, due to the slightly thicker cup, then work your load up from the starting loads in your manual. The small rifle primers have a longer and stronger flash than small pistol primers, so that works into the loading data equation, just the same as changing bullets, etc. However, if you're a beginning reloader, then my advice is to stick with pistol primers for handgun cartridges.
Hope this helps.
Fred