I was gonna post that a chronograph is the only true pressure gauge we have unless we install pressure gauges into our chambers, but I realized I'm too tired to argue
Good point but of course that is not without some variables as well. I was working up loads for an old Spanish Mauser and was getting close, but not quite to the muzzle velocity of the target load when I started getting some pressure signs. It took me a moment to remember that the original load was done in a full length Spanish Mauser with a 29" barrel. Mine was an old '93 Mauser but had the barrel cut down to 24" decades ago. I did a quick calculation and determined that if considering the difference in MV between the two barrel lengths, I was approaching max.
BTW--I think we may be neighbors. I'm in the Ohio Appalachian foothills as well.