That is an admirable list to acquire but you will find it impossible to locate a 410 gauge as it doesn't exist. 410 is actually a bore diameter: Gauge is an old system of measure where the number of lead balls that equal a pound determine the gauge: eg. There are twelve lead balls of the caliber of a 12 gauge (cylinder) that add up to one pound (1/12th), twenty lead balls the diameter of a 20gauge (cylinder) bore diameter that equal a pound (1/20th) etc. A 410 bore would equate to about 67gauge.
If I had 12(6) I'd love to have a Walther PPK in 32acp and a P230 in 380acp - Both are gorgeous guns with comely lines. Different than Beretta lines, but mmmm... on that note, Beretta 92 series in 9mm Luger.
41 mag in a stainless Smith and Wesson revolver of course (m657) - unfortunate this caliber is so neglected.