If your question is "Is there a difference between regular primers and benchrest primers as far as accuracy is concerned?" the answer is "NO". I've shot benchrest rifles for years where 100 and 200 yard shots are measured to thousands of an inch. I think I can safely say that the majority of benchrest shooters (if there were ever a majority in benchrest) shoot benchrest primers for quality and not accuracy. I order custom benchrest bullets by the thousands and can think of only 1 primer that failed to fire. I hope this helps.