It has always seemed to me that the level of precision in most annealing is akin to the level of precision in weather forecasting.
Absolutely true. Most don't bother to see there's easy enough ways to achieve a level of precision.
This from the "precision shooter" who believes ANY compression of the powder charge detracts from precision....
That's on the ragged edge of putting words in my mouth, but whatever "gun writer".
~ Possibly bending a seating stem.
~ Inducing more runout.
~ Bullets creeping forward and changing seating depth.
~ Crunching the size, shape, or coating integrity of powder kernels and changing the engineered burn rate.
All good good GOOD stuff, just hold three inches left!!!
I have $70 in my DIY annealer and zero cooked fingers there Wax Candle Man.