yes they can.
I have not shot them myself but as long as they are 68 cal. you would load them in the shell sizer just like the FS. The shell sizer is 2.25 long.
“Do not yearn too much for a sword made by a famous smith. This is because even if you give a good man a sword worth ten thousand coppers, he will not be able to beat a hundred men each holding a spear worth a hundred coppers.” - Asakura Takakage Toshikage, 1462-1482
Whatever your hand finds to do, do it with your might; for there is no work, nor device, nor knowledge, nor wisdom, in the grave, where you go.
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