Need Help: .308 FTF

[james_bond_007]

I'm starting into reloading using .308.

Background:
Bought Once Fired LC Military Brass
Tumbled, decapped, cleaned primer pockets.
Loaded 5 rnd groups w/ 40.0 to 46.0 grains H4895
Primed w/ Winchester WLRM (Winchester Large Rifle Magnum primers) new from Sportmans's (seated until primer would not move any more; just below top of primer pocket)
Used Lee Pacesetter Dies
M80 Pulled Bullets
OAL = Did not exceed 2.81"

Issue:
Tried in my Springfield M1A (only about 100 rounds through it; never had a FTF before)
About 50% FTF.
Saw a firing pin mark, no different than what I see with commercial ammo or the ones that fired, in the primer of the FTF cartriges.

Suggestions:
Bad Primers? that many ?
Bad loading technique? (If so, What am I doing wrong?)
Primers too "hard" (Some have said I don't need Magnum; Others have said it should not matter for firing...just causes a bit less accuracy on the loads)
Problem w/ my rifle's firing group ?

Your help and direction is appreciated.