Fleury,
I made one out of old jeans, but if you want to buy one, they have them here: w ww.arcinter.com/fr/chasse/armes_a_feu/accessoires-armes/c378014544/index.html
If you're a shotgun shell re-loader, use the sack the shot comes in. Sew about 3/4 of the bag closed, pour in the sand you can buy at any lumber store, sew it shut. Simple, fast and the right size. I'll take a picture and post it if you like.
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