Moderating the ignition isn't what I was thinking. The pressure would still be there. The inital jump in pressure from primer ignition could unseat the bullet. A primer with a smaller initial pressure spike might not unseat the bullet. The site below shows a few large and small rifle primers, with Fed 205m primers being the "lightest" shown. I couldn't find anything similar for pistol primers.
http://www.6mmbr.com/primerpix.html
