That actually does nothing different than I accomplish with a plumber's torch, and holding a case upside down over the flame
with a pair of needle nose pliers...and I don't wait until it gets 'cherry red' nor burn my finger tips..

I just count normal to six, drop it in a polymer bowl I get when the wife buys KFC, to hold the slaw or mashed potatoes...

I load in batches of 10 or 20... and now anneal each reload..

hitting 40 plus reloads with plenty more to go... is no problem...

and instead of those spendy little green propane tanks.. I just have a 7 gallon one someone gave me...

put like $10 or so over 10 years ago in it and its still going just fine...

$10 would have gotten me like 4 of those little disposable tanks...those would have lasted me 3 to 4 months...

"Minus the killings, Washington has one of the lowest crime rates in the Country" Marion Barry, Mayor of Wash DC

“Owning guns is not a right. If it were a right, it would be in the Constitution.” ~Alexandria Ocasio Cortez