35rem over pressure with less than max loads

[MEHavey]

What is your OAL with that 200gr Hornady RN in particular?

 

[243winxb]

Tumbling media left in brass after cleaning? Less case volume will increase pressure. Just a guess.

 

[jrumsey]

Have you checked your powder scale to be sure it is accurate? You may have a charge weight higher than you think.

 

[tightgroup tiger]

Did you try seating a little deeper in the case with those loads to get away from the rifling? Round nose bullets have a straight shank for a long ways compared to spire point bullets.
The round nose keeps it's full dia for a lot further out then spire points.
That in it'self will raise pressure but so will bullets being to close to the riflings.

 

[Enfielder]

I'm can't answer the OAL questions as I've disassembled all of the rounds I was leery of. I seated the bullet right down to the middle of the cannelure groove. That much I know.