Smitty79 Posted March 19, 2015 Share Posted March 19, 2015 The conventional wisdom is that you can't adjust for primer seating depth on a 550B. It seems like someone with a decent machine shop could make up some of the primer plungers (13967) that are a little longer or shorter on the top to make this adjustable. Maybe one of the aftermarket add on makers, like Uniquetek, could look into it. I'd probably buy some just to try alternate seating depths to see if I can get more reliable ignition on lighter springs without having to resort to 100% Federal primers. Link to comment Share on other sites More sharing options...
GrumpyOne Posted March 19, 2015 Share Posted March 19, 2015 Anytime the primer is not seated fully you are gonna have ignition problems. If the Dillon primer seater seats the primers fully, what is a different going to do that the Dillon doesn't do? Link to comment Share on other sites More sharing options...
Smitty79 Posted March 19, 2015 Author Share Posted March 19, 2015 I'm not sure I'm always getting them fully seated. How would I know if my problem is seating vs the primers are too hard? Link to comment Share on other sites More sharing options...
Vlad Posted March 19, 2015 Share Posted March 19, 2015 Why do you believe you are not sitting them fully? The first thing I'd recommend is making sure that the sitting stem is adjusted as per the manual and that your shell plate is sufficiently tight. Different stems might not even work anyway, as the cup and stem have to fit under the primer tube, and the primer has to fit in the cup. I'd think if the stem was longer/higher you wouldn't be able to pick up primer from the tube. Link to comment Share on other sites More sharing options...
Sarge Posted March 19, 2015 Share Posted March 19, 2015 My guess would be they would fear the liability of designing something to overseat the primers? If I had the problem I would find a way to put a small spacer in there Link to comment Share on other sites More sharing options...
dillon Posted March 19, 2015 Share Posted March 19, 2015 The design of the head of the primer seating punch allows seating a primer up to .009" below flush. You can verify this by pushing forward on the handle with no primer in the cup, and a deprimed case in station 1. The punch will stick in the primer pocket. Beyond this the tightness of the shellplate bolt has the greatest effect on primer seating depth. Link to comment Share on other sites More sharing options...
benos Posted March 19, 2015 Share Posted March 19, 2015 On a 550, for correct primer seating, you want to learn the "two-stage push" technique. On the downstorke, when you feel the primer contact the primer pocket, pause, then with one smooth push feel the primer bottom out in the primer pocket. Link to comment Share on other sites More sharing options...
pmt Posted March 20, 2015 Share Posted March 20, 2015 On a 550, for correct primer seating, you want to learn the "two-stage push" technique. On the downstorke, when you feel the primer contact the primer pocket, pause, then with one smooth push feel the primer bottom out in the primer pocket. Must be the new prototype 550 - my 10 year old 550 seats the primer on the upstorke. Link to comment Share on other sites More sharing options...
BeerBaron Posted March 22, 2015 Share Posted March 22, 2015 He means downstroke of the ram.... Link to comment Share on other sites More sharing options...
benos Posted March 23, 2015 Share Posted March 23, 2015 He means downstroke of the ram.... Right. Thanks. Link to comment Share on other sites More sharing options...
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