Chamber shoulder and case shoulder gauge for .303?

[ireload2]

>>>Never trust anyone who can give you the “exact” figures on how much your bolt will compress and your action will flex.<<<

Design engineers use these same mathematical formulae to evaluate their designs before comitting them to metal for testing. Certainly my numbers are vastly more accurate than NO numbers.
These calculations are relatively simple and can be completed by anyone with simple math skills.

Deflection = (Force X Length) / (area X Young's modulus)

Force = PSI of chamber pressure X the internal surface area of the case head normal to the bore

area = the cross section area of the component under load.

Young's modulus = a known value for steel = 30,000,000

In the case of the LE action the bolt is compressed and the receiver is stretched by the chamber pressure.