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Old February 10, 2013, 08:44 PM   #3
Senior Member
Join Date: July 5, 2007
Location: Pacific NW
Posts: 1,310
I have a 550B, but the instructions for the Square Deal B say you push the lever forward to seat primers, so that much is the same. Shell plate center bolt and spring-loaded detent ball look the same. Primer slide appears to be similar.

If primers don't seat completely, you can look at -
  • shellplate is loose, allowing case to tilt as primer is inserted
  • primer slide isn't adjusted correctly
  • lever isn't being pushed all the way forward

I have never bothered to clean primer pockets, but I have read reports of primer residue causing trouble with seating primers. But that would only apply if the cases had been reloaded many, many times and not cleaned.
.30-06 Springfield: 100 yrs + and still going strong
dmazur is offline  
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