Lost sheep, thanks for your reply.
The variance is like 2800 to 3300.
I'm not sure about neck tension but I think my primer seating is top notch.
Powders are either Varget, IMR4198 or Benchmark. Primers are Rem. BR.
The scale is an electronic Mettler Toledo Lab scale, very precise and reliable and there are no flourescent lights.
I havent fired factory ammo in the rifle, but I'll pick up a box and test it.
The powders fill the case from about 80 - 90%. (.223 Rem)
Thank you for the advice,
Guns don't kill people, fathers with pretty daughters do.
Two wrongs don't make a right, but three comes pretty close.
Proud NRA member