High-performance steel shot cartridges should only be used in shotguns that have passed the special steel shot proof and bear the words “steel shot” and a fleur de lys proof mark.
This shows it will handle high performance steel. These cartridges should only be used in shotguns that have passed the special steel shot proof and bear the words “steel shot” and a fleur de lys proof mark.
High performance steel vs standard steel
Guns who have shot the odd standard steel load (most guns ‘Nitro’ proved to at least 930 bar will comfortably handle standard steel loads) may fail to realise that the box of cartridges they have just purchased are in fact high performance steel.
The latter should only be fired through guns that have passed steel shot proof and have been proved to at least 1,320 bar.
It depends on the shotgun. A gun of modern manufacture with 70mm chambers and preferably no more than half choke should be perfectly safe to use with standard steel cartridges, provided that it is in proof and in sound order. Because steel is less dense than lead or bismuth, you should choose a shot size that is at least two sizes larger than that which you normally use. If you are in any doubt, then check with your gunsmith. If you have an older English side-by-side, however, I would not recommend using even the standard steel loads, as these could damage the barrel walls.
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