Buy a box of factory ammo as a reality check and baseline. Maybe pull down the reloads dump the powder in the garden if you aren't sure what it is and rebuild with a known safe book load. 35 in-lbs or so on the screws if not pillared, 50 in-lb with pillars. For the pressure point, every rifle is different, doesn't matter who's name is on it. Some want pressure, most don't in my experience. I'd float it to try and it is easy enough to add a pad if needed. Carefully inspect the crown and touch it up if in doubt. I've never had a Wby, but a sporter barrel will heat up quickly when you burn that much powder through.
