OK, now I have not one but 3 PM's from you. I dunno why they waited so long to show up. My email is either on the "Contact" page or just click on my forum name and a page should open that gives you an option to email me.
Here's your original order specs. It only took 5 seconds to find once I had a name to search for
XL alum 2 cav stud_locknut, BTAN 525 gr WW, 0.501, 0.501 x 0.100 fb
Item# 0.600 nL, 85% meplat, 055_crimp, 0.493 x 0.493 x 0.080 br , .14 x 0.46 stepped Hornady 50, 1.0 GtoB, 45 groove: , 2 bands 0.0832 long, 1.03 OAL, 0.1849 ci:
Here is how it might looked scaled up to 50 caliber using the Gator 50 short check (there are two styles of Gator 50 checks so you'll need to decide which one you want to use). This is with the weight held to 525 grains, so it is shorter than your 500 caliber bullet. Alternatively, you may prefer to increase the weight to 550 grains to maintain your original 1.03" OAL.