I would doubt that in the case of Britain as at the time no gun laws exsited here at all and didn't until around the time of the First World War. I can understand a country being jelous of outside trade coming in and wanting to protect its own. When we started with Proof I don't think Belgium had a gun making industry as such. Other European Countries followed much later and a lot still have no testing proceedure. We fully accept guns from other Countries with recognised Proof Houses without further testing.
Another useful service by the Proof House here is that they will pressure check reloaded ammunition, both shotgun and metallic, for a small fee. Send 11 rounds, one of which is dismantled to check contents, and then the others tested and a report returned. Takes the guess work out of reloading jobs. Lagopus.....
