I was working up a load for my TC Encore in .308. The bullets are Nosler Balistic Tip, 175gr. The powder is IMR 4064. I shot five rounds with 41 gr, five rounds with 41.5 gr, 10 rounds with 42 gr and 2 rounds with 42.5 gr. The third round of 42.5 gr is when the case head seperated from the...