Reloading question need advice

[17remhunter]

New Peterson brass every case was perfectly uniform in weight and length. After the first firing I measured the case length. Instead of the case stretching a little it was shorter by .015. Every case. Is this normal. The cases were 6 mm Creedmoor

Second question I have some new 17 Remington Nosler brass all prepped. I did nothing to the new cases just loaded them up with my standard load. They would chamber but i could not drop the bolt handle. I chambered a new unloaded case same thing. Could it be that the shoulders are a tad bit to forward and need to be bumped back or should I FL size each case? I have no issues with new Norma brass

 

[Wolfshead]

You should FL size each case before loading them.
After you can FL size or neck size them to your preference.
But you do need to size them first.

 

[Salmonchaser]

What he said. Sammi specs are pretty broad, from a reloaders point of view. In the first case it is likely the chamber is a little long, as the case expands the effect is the overall length shortens up a little. This was very noticeable in the Jarrett rifles I had, particularly the 338 which required fire forming an 8mm Remington case to the steeper shouldered Jarrett case.
Appears to be the opposite case in your 17 with Nosler brass which apparently is on the long side of the spec.
Nothing wrong in either case as long as you are aware on your first loading and adjust your dies accordingly.

 

[Addicting]

Never load brass straight out of the box. Set up your dies and FL them. If you did that, and it won’t lose, your die is not set up properly.