Do you slip that sight over the current one? Regarding the Lee Die, it's worked in every other rifle I've used and the 300gr 411 was specifically designed for the 95 or so Barnes says. My OAL is exactly the same as yours and it goes into the mag no problem. Those groups are a lot better than mine!

A good principle to guide me through life: “This is all I have come to expect, standard lackluster performance. Trust nothing, believe no one and realize it will only get worse…”