Is my gun proofed for steel shot?

To check if your gun is proofed for steel in the U.K. please look at the proof marks on your barrel. If there is a fleur de lys symbol on them, this means it has been proofed for steel. Please contact us with pictures of the proof mark if you need help identifying this symbol.


If you would like your gun proofed for steel shot, we can arrange this for you. Please contact us to do so.


Having your gun proofed for steel shot does not mean that your gun won’t suffer damage if you use steel shot, proofing just means the barrels are safe to fire steel shot loads through. It is common, particularly on older guns, that continuous use of steel shot through barrels can cause score marks inside in the barrel and eventually lead to irreparable damage. Newer models of chrome-lined barrels are less likely to be damaged. In any case, please speak to the manufacturer of the gun for advice.


PLEASE NOTE: If you are to use our chokes for steel, we recommend only going up to a ½ (Modified) choke. As a rule of thumb for converting choke constrictions when using steel please see the below table.


Choke Conversion - Lead to Steel Shot
Lead Shot Steel Shot
Cylinder Cylinder
1/4 (Imp. Cylinder) Skeet
1/2 (Modified) 1/4 (Imp. Cylinder)
3/4 (Imp. Modified) 3/8 (Light Mod)
Full 1/2 (Modified)
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