I remember reading a few years ago that large magnum rifle primers in a 25-06 were the ticket to better accuracy but you needed to start load development over because it increased pressure. I tried it and the results totally sucked. My sub MOA rifle started shooting 2.5" to 3" groups. I can't remember the magazine that I read the article in but it was some sort of reoading mag. Anyone have any similar experiences?

Migra

"Magnum" primers rarely improve groups; on the other hand, they don't often deteriorate groups to the degree you have experienced.

In a .25-06, magnum primers certainly aren't necessary, so if you're having good luck with "standard" primers, just stick with them.

Stonecreek,
I already nixed the magnum primer project. The rifle shot fine before but I'm always looking for "something just a little better". I was just wondering if anyone else had seen anything this dramatic just by changing primers.