Your AT 500 is shipped with the "universal" shellplate installed. The "universal" shellplate has four shellholder slots: #1, #2, #3 and #5. This allows you to reload a wide variety of calibers.
All AT 500 reloaders are shipped with the #1 slot visible. If the caliber you wish to load requires one of the other slots on the shellplate (see the caliber conversion chart on page 3 to be sure), you may change this by first loosening the brass-tipped set screw (Figure 5) at the top left side of the shaft, just below the shellplate platform, with the supplied 1/8" hex wrench.
Caliber Conversion Chart
Next, loosen the shellplate bolt with the 1/4" hex wrench. Then reposition the shellplate cover to display the slot you desire to use. The shellplate cover has two dimples (Figure 6) to help you align it with the shellplate.
Tighten the shellplate bolt with the hex wrench - then back the shellplate bolt out about 1/4 turn so that you can rotate the shellplate easily. There should be no looseness or "slop" at this point. When you rotate the shellplate, you should be able to feel and hear the shellplate "click" into place. Re-tighten the brass-tipped set screw under the shellplate platform to prevent the shellplate bolt from rotating as the shellplate is indexed.
.257 Roberts .257 Ackley Imp. .270 Win. .284 Win. .30-06 .308
.358 Win. .35 Whelen 6mm Rem. 6.5-06 6.5x55 7mm-08 7.65x53 7x57
7.7 Arisaka 7mm B.R.
7mm Exp./280 Rem. 7mm Int'l Rim 7.5x55 Swiss 8x57
.221 Rem. Fireball 3
.380 ACP 3
.357 SIG 5
7 TCU 3
A A A K K K K K K K K B B B B K K K K B K B K K K B B
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