I have used lard in the past with good results. I don't know if it had salt in it, but what the heck --- you should be cleaning your revolver after use, anyway. Black powder has salt in it, for that matter, and Pyrodex is corrosive (something about percholates, which I don't quite understand).
If you can't find Crisco, use lard. That's what I've done in the past with good results.
Today, I use mutton tallow. This may be even more available in France. Ask your local butcher to save the fat trimmed from mutton. Now, throw the fat into a big pan or soup kettle of boiling water. Boil the heck outta all your fat scraps, then fish out any floaters and throw them away.
Then, turn off the heat and place the pot in a cool place. This time of year, you may be able to place it outdoors overnight and check it in the morning.
When the pot and water are cold, the tallow will have solidified into a big cookie on top of the water. Usually, if it's cold enough, you can tip it sideways in the pot, get a hand under it, and pull it out as one big cookie. Pat-dry the underside with a paper towel and Wah-Lah! The tallow you want!
(Yes, I know that it's spelled voila'! ... but wanted to make you go :eek: )
Heck, you may be able to buy mutton tallow commercially over there. Dixie Gun Works sells it here in the States and it's good stuff.
I would think there are far more sheep-eaters in France than there are in the states; mutton just doesn't seem popular in the states.
Search my name in this website for cap and ball advice. You'll find a lot (Gatofeo is a verbose ol' cat ... heh).
As for France, I have my opinions about that country but I find it rude to express any political opinions in this site.
My mother was from Belgium. I still have many relatives in that country. Mom fought the Germans in World War II as a member of the Belgian Resistance. Her first husband was captured, thrown into Breendonk torture camp south of Brussels, and executed two weeks before D-Day.
Mom was twice imprisoned by the Gestapo for her activities but survived. She met my father, an American G.I., after the Battle of the Bulge --- she was a 27-year-old widow at the time.
I don't agree with all that America does and I generally let my dissatisfaction be known to legislators and those with whom I disagree. But not in here. I come here to share and acquire knowledge. Period.