The Hornady Universal shell holder is precision machined from solid steel and heat-treated to perform flawlessly. Wide mouth and rounded edge at the opening allow smoother case insertion. A single shell holder may be used for multiple calibers. They also fit on most other brands. Shell Holder #1: 22-250 REM, 7X57, 22-250 ACKLEY IMP, 284 WIN, 5.6X57, 280 REM 22-6MM, 280 ACKLEY IMP, 6MMX47 LAPUA, 7X64 6MM INT, 300 SAVAGE, 6MM BR REM, 308 WIN, 6MM CREEDMOOR, 30 TC, 243 WIN, 30-06 SPRG, 6MM REM, 30-06, ACKLEY IMP, 6MM-284, 7.7 JAP, 240 WBY MAG, 7.92X33 KURZ, 250 SAVAGE, 8X57 (8X57 JS), 257 ROBERTS, 8X60S 25-06 REM, 8MM-06, 6.5X47 LAPUA, 338 FEDERAL, 25-284, 338-06 260 REM, 358 WIN, 6.5 CREEDMOOR, 35 WHELEN, 6.5X57, 9.3X57, 6.5-284, 9.3X62, 6.5-06, 458 SOCOM, 270 WIN, 450 BUSHMASTER, 7MM BR REM, 44 AUTO MAG, 7MM-08 REM, 45 WIN MAG