Originally Posted by Rocky Raab
. . . one thing often overlooked when discussing gun strength is that the bigger the cartridge, the less barrel metal remains after they make the hole.
Absolutely right. But in this instance, the Ruger #1 has been chambered in .458 Win Mag by Ruger itself in the past. So the Lyman manual's limitation of the essentially same diameter (actually fractionally smaller) .45-70 to 60% of the .458 Win Mag's peak pressure didn't add up to two plus two for me. Obviously the strength of the brass at the head has to be monitored, and not simply be assumed to tolerate .458 Win Mag pressure. But if the case holds together, so should the gun.