The difference between .45 cal and .41 cal is .042 in. Times this by 6 gives .252 in. This would not be enough to fit a 7th chamber in. Also, the .45 cal is a low pressure number. Using .44 cal gives a difference of only .019 in. Times 6 gives only .114 in, clearly not enough to fit another .41 magnum in.
Best,
Rick
|