I wonder if it isn't the primer being too hot. A standard one might be better.
It didn't help when my wife came over to ask if I was almost done
she only gave me two hours in the first place to shoot five rifles. Didn't get quite finished with all the loads for all of them.
My Krag did shoot very well on the other hand. Just need to try it again to prove the load on several targets and then I can load a bunch for it come winter time. What a pleasant suprise to see three strikes from that carbine go inside an inch with next to no load development. Wait, someone slap me, it was likely a fluke.