It always surprises me when I see people say that a load's unsafe if it doesn't meet whatever current specs call for, regardless of the gun it's to be fired in or the load in question. Given the use of some common sense (I know, it's hard...) and sound practices, it's hard to get into trouble if you know what you're doing. Half the fun of handloading is recreating the vintage loads that brought us to where we are today. My pre-24 doesn't know that SAAMI changed the specs or how old it is. If it worked for Skeeter and Elmer, and if I recreate those loads correctly for what's safe in my gun, there's no reason for it not to be safe. A little hot, maybe, if I want it that way.