Changing Primer Size

Your AT 500 has been shipped to you with the large primer bar installed and correctly adjusted to feed large primers. If the caliber you have selected requires small primers, you must change to the small primer cup and pin. Do this by loosening the set screw and removing the large primer cup and pin from the primer bar. Install the small primer cup and pin. (Figure 7) Do not tighten the set screw yet.

Figure 7 - To change the primer cup and pin, loosen this set screw. See arrow.

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Figure 8 - Lowering the platform onto the primer cup.

Figure 9 - The primer cup, showing through the platform.

Figure 7 - To change the primer cup and pin, loosen this set screw. See arrow.

This set screw needs to be loose in order to align the primer cup with the platform. Lower the platform onto the primer cup (Figure 8), then tighten the set screw while the cup is in the platform. (Figure 9)

Figure 9 - The primer cup, showing through the platform.

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