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I posted for the first time a while back about my newly rediscovered enjoyment of reloading 9mm and .44Mag. I have a vintage 1986 Square Deal press, which between Dillon and me now has a few newer parts and overall works great. I am gradually getting wiser as to how to ensure quality at various points in my process-installing an inexpensive light near the bullet setting station, to ensure powder level looks right, using a case gauge on the finished rounds BEFORE I take them anywhere near a range. I also check and record the COL for that particuar batch. I've become a brass collecting fiend on my range visits. I sort the brass pretty carefully, culling out the .380, .40, +P, etc. I then clean the brass in a tumbler-really prefer the walnut media for getting them clean. I notice though with these once or more-fired cases that I'm getting anywhere from 5-15% which fail to fit in the case gauge. Most fit great, easy in easy out; these few absolutely refuse. Haven't traced it to a particular brand. I ensured my sizing die was going all the way down the length of the case, I began checking COL more frequently, thinking maybe I'm seating the bullet too deeply and bulging the case. I spend a little while after every loading session with the bullet puller, trying to save the bullets and powder. Recently I heard about an "undersized" sizing die made by Lee and maybe some others, which sizes the case .001-.003 smaller than spec. Supposedly competition shooters who want to avoid ANY problems feeding use them, as do some who experience some problems with re-using range brass. I have an RCBS partner press I picked up for a good price, thinking I'd use it for sizing cast bullets. The undersized die would fit this; and I could pre-size my used brass before putting them thru the Square Deal. Does anyone have any experience with these? Is it a good idea? Should you seat the bullet not as deep, since shrinking the case might increase the pressure?