Re: Explaining Headspace
In reloading, "sizing" always means "squeezing smaller". It's short for "resizing". Making the neck of the bullet big enough to accept the bullet is "expanding". First you "size" it, which makes it undersize, and then you "expand" it, which makes it big enough.
Meddle not in the affairs of dragons, for thou art crunchy, and taste good with catsup - George of Lod, Year of Our Lord 297
I always take precautions.
Beware the Evil Bullet Fairies.