well we have all heard it from ol Jim "44 Man" on using fed primers
I though yeah yeah sure thing primer is a primer rite?
I did a test today for myself I have a load of 23.0 gr.imr 4227 with winchester primers and fed 150 match primers and the 50 yard groups out of my S&W model 29 4" barrel gave me all the proof I needed
the winchester load had a pattern at 50 but the feds grouped about 5" for a cylinder full
I shot 2 cylinders of each and they were similar in size
i was using a 250 gr Keith boolit cast from ww
so Jim if you are reading this my hats off to ya you were rite on the money