just got the new Lyman reloading manual Last week. i haven’t had a new one in a while so I have been spending time comparing.
I asked before ordering it if the new would have data for a 350 Legend.Last "new" manual I bought was from 1970 and that was about a year ago. My newest is Lyman's 49th and it barely has any cartridges I shoot. But, that's me and I'm weird that way. If a fella shoots new cartridges and powders he better have a new manual!!!
Extrapolation, means there is no data; just someone's supposition of some signs that were experienced.Every firearm is an entity unto itself and regardless of the data being used one must pay attention to what's going on and make careful observations. That goes doubly so with old rifles and long out of production cartridges where the only data available, ever, is what one can extrapolate.