Thread: Mystery problem when reloading... Help.

Firstly, you have to seat your projectiles to fit the magazine, otherwise you've got a single shot firearm. Its that simple
Secondly, if your bolt wont close you need make sure the case is trimmed to the specified length. If so, then you'll have to resize the cases so as to "Bump" the case shoulder back a bit - like half a turn of your die. Try a case in the chamber and repeat the process until the bolt closes easily. If its hard to close in an unfired case, it'll be impossible to open in a fired case.
3. Beg, borrow or steal a collet-type bullet puller. You can pull all the projectiles easily and reload them later. You can also save the powder back into the ORIGINAL container.
4. Unscrew the primer stem from your sizing die and then you can resize the case (to bump the shoulder) safely. You don'thave to
de-prime the cases

Often its the long slender projectiles with a high BC that wont fit magazines.Eg Barnes, Bergers, ELDX's
You might have to compromise with shorter "softpoint" type projectiles