I recently came across a new .451 Conversion kit with 50 rounds of unprimed brass in a red plastic case with loading manuals in the factory box. They are asking $295.00 for it. Is this a good deal? I have a Scoremaster but was wondering if the conversion kit needs some tweaking or does it work right out of the box? I don't have any experience with the .451 caliber and would like some advice on this matter. Thanks!