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my .45/70 is a barrel insert in a .12ga shotgun so I keep loads down to top of trapdoor levels...the recoil if go above that, is rather intense in light single barrel gun...in saying that,once...

looking at the manual...a 350 at just over 2000fps is top of bottom teir so hot enough to cause issues in old weak action but should be fine in anything modern..but we all know each rifle is...

yip the three levels have been there forever...you plus P loads are simply factory loads for the top tier guns and in the lawsuit crazy USA its about he only way they could possibly market a load...