If its for a new barrel Dan ,measure your neck diameter in the chamber, cut your brass to the neck thickness that you like ,Load the brass to be fire formed with your powder and bullets, usually you will only get around 28.2 of 133 in them, seat some bullets and shoot them,if the lot of brass is good and you have a really good sizing die your brass problems will go away,it will also break in the barrel as well(if it needs it).its quick and easy.most are doing around 20 cases, there are some different theories on how long you run the brass, this again depends largley on your sizing die/chamber fit.weather is getting nice so we should all start getting out to practice