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Carbon Rings can increase chamber pressures. For that reason, they must be controlled to keep pressures at a safe level.
Favorite Short-Range Load development targets:
Shotmarker circle-cross target: https://cdn.shopify.com/s/files/1/0525/7235/6768/files/ShotMarker_Load_Dev_Target.pdf?v=1614621078
OCW Target (circles with orange diamond): https://accurateshooter.net/pix/ocwtarget.pdf