the spl case is shorter than the mag case.
shoot a lot of spls and a crude ring builds from the end of case towards the forcing cone area of the cylinder.
now when you try to put a mag case in it the crude inhabits that, and some times can prevent a mag from fitting.
it's simplily a matter of brushing out the cylinder holes, problem solved.
shooting lead will increase this issue more than shooting jacketed spls.
since you hand load, there is no reason to use special cases, just reduced loads in mag cases....unless you are running super powder puff loads in the special cases.
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