Ordered one of Kelye's base pins for my 7.5" 327, dropped right in, perfect fit,much less play in the cylinder. Made it to the range Thursday, my 25 yd. cast bullet groups that were hovering around 1" are now 5/8". I have installed several of Kelye's base pins in my Rugers over the years. Some have improved a little, some have improved a significant amount, like my new Single Seven, all have always shot better Kelye's pins. Getting 1630 fps with the factory Federal JSP. May have to see how it does on a feral porker.