I have been reloading for my .257 Weatherby Magnum and 7mm STW using Federal 215 primers. The groupings on both calibers have been under 1/2 MOA at 100 yards. I've been thinking about switching to the Federal Gold Medal 215 match primers because the price difference is less than $4 per 1,000 at Midsouth Shooters Supply. Is there any advantage to switching to the match grade primers, i.e. better groupings, lower SD for velocity? Thanks!