I use a primer pocket uniformer on most all my brass. That is how I clean the primer pocket before reloading.
If the uniformer will not scrape(clean)the bottom of the primer pocket,the pocket is too deep,and I trash it.
I test new brass this way also. The uniformer should just slightly bottom out,but if turned gently,should not cut any brass from the bottom of the primer pocket.
If there happens to be a high spot in there,it WILL take that down though.
My little tool is RCBS. ---- SAWMAN