Thread: Blown primer pockets

This is the third case that this has happened to Lapua brass, fifth reloading running 45 gr of 2208 and a 150 gr sierra gameking. Primers are Winchester large rifle. Case prep tumbled, washed and blown out. Dirty pockets get a clean. Neck sized only.
Same primers used in RP and Winchester cases no problems with them, just the Lapua anyone got any ideas?, loath to dump the 50 cases but getting little gas cuts in the bolt head is not a good look either