I had my father load some .300 Win Mag rounds for me in the last couple weeks. When I shot the 20 rounds he loaded for me, I could feel a distinct delay between the firing pin "dropping" and the round actually going off...Some were instantaneous, but most had a delay (seemed like a millisecond). I've never encountered this before as my father has loaded a lot of 308 for me with no problems. He used the correct IMR powder, 52.5 grains(I can't recall the number right now...but it was spec according to the reloading manual); the primers were CCI large rifle; the projectiles were 180 grain Nosler Accu Bond. The powder is only about 6 weeks old, primers about 1 year old...both are stored in dry places. What could possibly cause this? Could the primers be seated too deeply? I'm thinking the primers are bad.