Smoke and mirrors often quoted by folk who dont reload Scott.
The bottom line is that for most bullet and powder combos there is a safe starting point that should not blow anything up. The more experianced you get the less time it takes you to develope a safe, accurate load.
Many beginners dont get this and wonder why because a pet load works in one rifle, it is not safe to simply bung it in an identical rifle and crack on.
I have given up on the quest for velocity above and beyond, I just need something that chambers perfectly each time, ejects smoothly and does 1MOA or better out to 600....reliably. I dont think many people understand what effect a simple small change in load will cause in terms of harmonics and group size.
I reckon every handloader should shoot a ladder test at least once, it gives a real insight into nodes and ideal load starting points with minimal ammo use.
And then there is F class