ill try and answer some basics.
first get a reloading manual it will have all the answers as to correct case sizes. you should use the dimensions listed in the manual your using powder weights and seating depths from. while there are standard sizes for a given caliber, you will be much safer if your not exceeding the information given in the manual your using. while its ok to go slightly under max case length its extremely dangerous to exceed max case length. it is also very very dangerous to exceed maximum seating depth without special tools to measure the exact throat length of a given firearm.
do not re-use powders from commercial cases.
do not use charge weights based off salvaged powders from commercial cartridges
when you pull a bullet from a loaded case you cannot reseat it without at least resizing the neck of the case that is why your having bad results reseating.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent
Last edited by JonM; 09-04-2012 at 12:40 AM.