Got the article and reread it again..really interesting..basically the author, Gary D Sciuchetti, did an amazing job..in an attempt to develop the most accurate load for a .308W..tried various brands of brass, primers and bullets..but kept the powder the same..using Varget..

Gary states in his findings that using a magnum primer does increase pressures and suggests if you switch from a regular to a magnum you back off your loads by 2 grains and work back up from there..He also states that magnum primers are good if you need them but if you don't need them he suggest not to. States a magnum is primarily designed for a large volumne of slow-burning powder or extreme cold weather..of which the 308 for this test did not qualify.

His tests show the effect of primers on accuracy, how long various brands of brass last during full length resizing and the accuracy of bullets tested..

In the end he suggests he come away with certain findings in his test..they are as follows:

Changing the quanity of powder can change groups by up to .75 inch
Changing the brand and type of primers can change groups by up to .313 inch
Changing brass brand changed groups by up to .25 inch
Changing brands of bullets changed groups by up to 2 inches
Seating depth fo solid copper bullets was crucial

One final item I thought was intersting was that he also test factory ammo and it was amazing how accurate some loads were---yet the reloads all in all were more accurate overall..

It is an very interesting article for anyone reloading..

Ripp