I recommend trying different ammunition also. I load my 686 and 64 using Safariland Comp II and Comp III speedloaders.
I have never had any issues with 38 Special brass, and I have dozens of different head stamps. BUT not the one you mentioned using.
I have noticed some problems seating small pistol primers in some 38 Special brass with S&B and GFL head stamps. They acted like they have shallow primer pockets. I know that the under cut sizes are different on American 38 Special ammunition. Winchester has a narrow under cut requiring a .020 Moon Clip thickness when used in a moon clip revolver.
So no telling what could be different on the brand of ammunition you are using.
My guess is the SL Variant does not like your brand of ammunition due to some variation in dementions.
Bob
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