![]() The bore size measurement is taken 9” from the breech. It is also illegal to try to export an ‘out of proof’ gun. It is illegal to offer for sale a gun in the UK that is out of proof. Every time this happens, the bore gets bigger. The reason for bore enlargement is usually because the bore has rusted in storage and had to be polished clean, thereby removing metal. 729” will be out of proof when it reaches. It is also considered out of proof when the bore size reaches ten thousandths of an inch in excess of the size stamped at proof. It also tells you how much pressure your gun is built to handle.Ī gun is considered ‘out of proof’ when the barrel is materially altered or damaged (for example, there is a hole in it or the chambers have been extended). Proof shows your gun is safe to use with any commercially loaded ammunition you may put in it. Since most commercial ammunition loaders load with a 20% margin for error (i.e 80% of maximum allowable pressure) that leaves a 45-50% safety margin. The proof charge is of 25-30% higher pressure than the maximum pressure any commercially loaded ammunition can generate. If it passes this visual inspection, it is then tested by placing the barrelled action in a special holder and fired twice through each barrel. It must be carried out by either the London Proof House or the Birmingham Proof House.įirst the gun is inspected (called ‘View’). Proof is a safety test that all new guns in the UK have to pass in order to be offered for sale. ![]()
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