With lead or alloy cast bullets your max speed will be around 1500 fps unless gas checked and then you might get up to 1800 before you lead up badly.
I've never shot so small a cast bullet but do shoot a bit of larger stuff and either subsonic or around 13 to 1500 fps seems to be a happy place.
I think you will also need a faster powder than 2206h and possibly Lil gun, as here is little resistance with a cast bullet and you don't develop enough pressure to completly burn them length junk in the bore. Ap 70 or unique, or trailboss might be a better option.
I'm sure rob, shooter nz will chip in he knows most things cast backwards.
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