There is allot of valuable info on the thread. I've printed it and will keep in my loading notes for sure. Here are a few thoughts I have on handloading.
When I went to boot camp, Many Many years of ago, they drilled one thing in our heads that that I remember like it was yesterday, "Just Becasue It's New, Doesn't Make It Clean". They were referring to our gear.
Ok, that's interesting, but how does that apply to hand-loading. Well, when I buy components, expecially brass and bullets, I assume nothing. I "measure everything", weights, dimensions, etc, and I record those values via lot numbers, especially for load development. I determine what the lot is, min / max / mean, and whether it's suitable for what i'm doing. I also weigh these rounds in many different stages during the loading process as a safety check. Especially duing primer seat and powder charge steps, then again after bullet seating.
Why is that important, safety primarily, but also consistent & accurate loads. How would that 40gr load work if by chance you got one 55gr bullet, and didn't check the weights? If your on the edge of your max pressure and velocities, could be a serious and possiblly fatel problem.
The other thing I've found invauable, is record keeping, both at the reloading bench and the range. That coupled with a solid reloading procedure can produce amazing reuslts that are safe. Each load / build is a procedure on it's own. Sure, there are mauny common steps, but each load has a unique process that should be followed.
Another thing I'm always careful about is component selection. Once I've built up a load combination, say on Norma or Remington Brass, If I don't have that brass available, I don't swap one for the other. Same for all the rest of the components. If I dont have what I built the load on, I don't load it until I have the right compnents.
The last one I'd like to strees is establishing a proper load development process and sticking too it. There are many models available for this, but you need to research each, understand there purpose & limitations as well as the safety aspects of each. Just because a manual calls out a min / max component combinaiton, don't assume it's safe for your particular weapon, as each weapon is like a finger print, they are all different and you should start low, then build up to what works best and most importantly, works safely. If you change any of the primary components, you must assume (from a safety stanpoint) that nothing has been verified to be safe, as you've not gone through your load development process with them.
For a few final thoughts, I find handloading as enjoyable as shooting itself, however, safety is the primary concern for me, as it is for "all" the major ammo MFG's. They spend millions on safety & load testing, and for a good reason, they want us to enjoy the product, but they want and need it to be safe. Assume nothing, validate everything, enjoy the hobby and most of all ...
"Be Safe"