Dan,
Oddly enough, I have used the same load with a Federal primer in my Marlin 336. And yes, I came to the same conclusion - it's too hot for my firearm and my tastes.
The only manual that I found the load in was Hornadys. Follow your instincts - it it's beating you up or making your cases "flow" against the bolt head, ditch it. It ain't worth the problems of a exploded gun and the resulting long-term hospital stays.
I say this with some associated experience. My 336 didn't blow, but last year I had a disc partially removed from my back at L5-S1. In a week, I have to have an operation to repair my diaphragm, take my stomach and
large intestine and move them out of my chest cavity, putting them back where they belong. How does this factor in?
About three weeks ago I said to hell with everything, and sighted in my .30-06 and tried to sight in my 336 30-30 with a Williams sight.
Short answer is that the .30-30 with those loads beat me up more than the .30-06 and it's own hot Hornady load did. I also found signs of overpressure on the case heads and primers. I now look forward to the job of pulling all of the loads apart - after I'm off the pain killers, of course.
Moral of the story: If one manual disagrees with the rest, look closely at why and then follow your own good judgement. Getting that extra "oomph" out of a load isn't worth the pain and trouble.
One more thing...the Williams FP sight didn't work worth a darn. I'm switching it back to a Lyman. :grin: