Hello gentlemen

Thank you for your comments on lathe versus hand chambering. To be quit honest, chambering now sounds more complicated than I thought before. Back to my question; Having somebody professional with an computer lathe doing the lathe work on the barrels (if LotharWalther won’t, I’m sure I can get somebody else to) has several advantages as I see it; both barrels will have the same contour, I wouldn’t have to by (you can’t rent in DK) the reamers and I wouldn’t need to buy/borrow a lathe and learn to use one. So I would prefer to have it done.
As I understand Headspace on DR and shotguns this is the distance from the base of the cartridge and the breechblock (action face), but as the breech and the breechblock on a closed gun virtually touches, headspace could be defined as the distance from the base of the cartridge and the breech. So the headspace could be done on the barrels without monoblock and the action. Aligning the breech on the new barrels and the monoblock would give then give the right headspace?

Is this right or am I missing something?

Regarding the calibre; The 16 gauge is proofed to > 32.000 PSI. So it should be able to take the 450 NE. But will the gun be to light?

Regards
Nagell