I semi recently got a pid and have discovered the world of both consistent temps as well as accurate measurement of said temps.
Before i got this i was using a dial thermometer that went up to 750.
Often i was casting at temps above what the dial would measure, and have recently figured out that it probably wasnt accurate at all considering i can spin the circle piece and with it moves the numbers.
I was also casting with wheel weights with no additional tin. Never really had a problem with fillout or casting period, but now have also started using pewter lead alloys rather than high antimony alloys. Kinda stepped up my game in a few areas at once.
All of the Above is what leads me to this question, its really just a search for knowledge rather than a solution to a problem.....
Why is it often recomended to cast at the lowest temp that provides good fillout? Casting at higher temps can make frosted boolits, but they are said to shoot equally well, and when ive gotten frosty boolits i havent noticed any change in quality.