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Are you full length resizing? Don't! In the TC you should always resize just enough so that it takes a snap to shut the barrel. This especially true using stout loads. (And very important with bottleneck cartridges like .223 and 7TCU)

Excessive resizing over works brass and hardens it making it brittle. The brass gets over worked twice using stout loads and will harden even faster.

Also keep in mind that there is .007 difference between minimun brass dimension and maximum chamber dimension. That's alot of squeezing and expanding for a piece of brass.
 
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