There was a time when Weatherby brass was soft. What was the date on that reload document? 338 Win Mag equaled or bettered 340 Weatherby. Same with the 300’s.
Look in other (new) manuals you’ll find that the Weatherby loads better the Winchester’s.
I prefer classic. Semper Fi I used to run with the hare. Now I'm envious of the tortoise and I do my own stunts but rarely intentionally
