Pacnor contours can be found here http://www.pac-nor.com/contours/ MGCM= Match Grade Chrome Moly MGSS= Match Grade Stainless Steel SMGCM= Super Match Grade Chrome Moly SMGSS= Super Match Grade Stainless Steel 14 (.144") 17 (.172") 19 (.198") 20 (.204") 22 Rimfire (.222") 5.45 Russian (.222") 22 (.224") 228 (.228") 6mm (.243") 25 (.257") 6.5mm (.264") 270 (.277") 7mm (.284") 29 (.298") 30 Tight Bore (.298") 30 (.308") 303 British (.311") 32-40 (.321") 8mm (.323") 338 (.338") 348 (.348") 9mm (.355") 357 Pistol (.357") 35 (.358") 9.3mm (.366") 375 (.375") 10mm (.400") 408 (.408") 41 (.410") 411 (.411") 405 (.412") 416 (.416") 404 (.423") 44 Pistol (.429") 425 WR (.435") 45 Pistol (.451") 458 (.458") 475 (.475") 50 cal (.500") 505 (.505") 50 (.510") 50 BMG (.510") 550 (.550") 577 (.585") 600 (.620") 700 (.700") 705 (.705") 12 ga (.729") 20mm (.825")