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To know the exact measurement of the chambers in a quick and easy way, without tools, there is a way that I imagine many of you know.

We need a stick, a wax candle and a ruler. We will make the measurement in one of the two chambers, if the shotgun is SxS or O/Y. First of all, we will make a block with newspaper and we will put it in the barrel at a distance of about 10 cm from the extractor. This will act as a stop for the wax.

The first thing to do is to place the barrel vertically with the breeches facing upwards. Tape both barrels, leaving a gap in which to test. Optionally, the inside of the barrel can be lightly oiled.



Fill the barrel with wax.


Wait for it to cool and solidify.


Cut it so that it is level.



With the help of a stick and through the front barrel, we will remove the wax candle with small blows.

Measure the length of the chamber.


This is the chamber length of my W&C Scott & Son, that surprise me with 70 mm!

PD: Sorry for my bad english and regards!