BaggerBob,
I swage the crimps on primer pockets with the RCBS primer pocket swaging tool. I like this method, since it doesn't remove any material from the case.
I haven't had any problem at all with loose primer pockets in any of the NT brass, whether it's large primer or small primer pocketed.
As a matter of routine, whenever I feel a primer go in too easily in any case, I've made a tool that I can stick inside the case and push the primer back out by hand, if it is indeed too loose. Those rounds always go into the recycling buckets, no matter what the caliber.
This is actually the first I've heard of loose primer pockets with the NT brass. The brisance is different with the NT primers, but that alone wouldn't cause primer pockets to loosen, since there isn't enough force in a primer to expand brass that's that thick. The faster brisance is what prompted the enlarged flash holes and crimping to keep them in place. It's also what prompted the use of small pistol primers, which have been used in European .45 acp for many, many years. It is after all a small case.
Hope this helps.
Fred