I have a CVA Wolf, probably 4 years old, topped with a Nikon Omega Slughunter 1.5-5x36 scope. With 80 grains of Blackhorn 209, Harvester sabots, and 250 grain Hornady red tipped bullets, the rifle shoots 1" groups at 100 with scary confidence. Yesterday i crammed 9 shots into a 1.5" x 1.5" piece of paper, with room to spare (the first shot from a clean bore was only 0.75" off!). But, while doing so i depleted my stash of Nobel Sport shotgun primers, so i opened a box of Federal 209A primers, thinking that i will be hunting in really cold weather and that Blackhorn likes to be ignited hot and violently...
Well, this primer is too much primer for my rifle. The primers flow, crater, and get into the firing pin recess...I had to wiggle the action to open it. Beware.
I fired 3 primers without charge and 3 with the above described charge. All six times the primers showed signs of way too much blow back and pressure. But, the 3 shots fired with a charge and bullet struck exactly in the same holes and group as the shots fired with Nobel Sport primers.