Originally Posted by
btroj
Gear is exactly on point with what I am seeing. The really low tin seems to make the HT temp less critical.
I took a batch of 4 month old air cooled range scrap bullets out last night. Split them into 3 groups of about 50 each. One batch was heated for a full hour, in a preheated oven, to 340. One batch was heated for a full how to 420. One batch was left as is. The as is batch has reached 14 BHn after 4 months of aging. Right after the quench the others measured 9 and 9.5. Will be testing daily for a week or more to see what happens with time.