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Old May 18, 2012, 07:51 PM   #7
res45
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Join Date: September 15, 2007
Posts: 561
The cannalure on the HB wadcutter loads serves two purposes to secure the bullet in the case and to provide uniform ignition. Speer did test several years ago on various degrees of crimp with wadcutter loads and found that those with little to no crimp didn't group well.

Depending on the depth of the cannalure in lots of case it will almost disappear after several firings and resizing. Back in the day when I use to shoot HB wadcutters I seated them flush and used a light roll crimp.
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