Springback

[powderburner]

I think that the springback would be different in every chamber , I have zero in my thick wall brass and my pp bullet the bullet seats with the same pressure and I do not resize at all , my 44 does need about 2 tho, sizeing on the neck to hold the bullet , my tight chamber 45 does not move either , the inside is bore diam and the outside is chamber diameter , the case does not have to move to seal the chamber hardly at all and then drops out and does not need sizing, I have put a lot of loadings on both the thickwalled 45 and the tight chambered brass and have yet needed to tighten up the necks , I have to full length resize the 50-2.5 to get it to hold a bullet as that chamber is really generous,
you shoot a lot of different calibres it would be interesting to see how they change especially with some of your high intensity ctgs ,,,