Huglu has built a test 470NE on one of their 16 gauge actions as per the importer to test viability. The gun was shot hundreds of times at full nitro and proved at 30% above full load. No issues. This info is per the importer, again. Talking to the smiths at Huglu..through the importer who speaks Turkish...the steel is C1040 Mild carbon, heat treated to a BN of 47. I have had two frames tested to confirm this. I then had a frame Aux-Treated to toughen it even more. I then proved this frame at 458 Lott pressures with no issues.

What issues could you have? Primers extruding with possible piercing back into the frame through the firing pin holes which are not bushed. So basically without bushed firing pins you are limited to pressures that the primers can take. I regulate to 10tons max, not because of the strength of the action, but because of the strength/safety margin of the primers. If you want to take the time and have the skill, you could bush the pins, a very difficult and costly undertaking. This is all on box-lock actions. With hammer guns, the pins are bushed by design, and should not present any of these issues if they are of the positive lock back screw-in type. The type that have just a retaining screw may not have the strength to hold the pressure if a primer rupture were to happen.

BTW, my ten ton load is good for 4500FPE in a 450NE (or 45-120 Sharps) as per GW loads.

BS-