Found a local shop with plenty in stock, had heard they were slightly oversized and once you used them the hulls would not be useable with other shotshell primers.
What I found
#1 these seem to be relatively straight walled compared to the Winchester and Cheddite primers (which are slightly tapered a few thou)
#2 they are not oversized according to my calipers
#3 so far in my tests the Win primers still seat tightly after firing with the NobelSports.
I do not run max loads and this test was with 12 gauge only with Rem Gun club hulls.
YMMV
What I found
#1 these seem to be relatively straight walled compared to the Winchester and Cheddite primers (which are slightly tapered a few thou)
#2 they are not oversized according to my calipers
#3 so far in my tests the Win primers still seat tightly after firing with the NobelSports.
I do not run max loads and this test was with 12 gauge only with Rem Gun club hulls.
YMMV