Primer pocket depth and flash hole diameter can cause deviation in performance.
How do your seat your primers? That can cause more deviation than any effect from not cleaning prior to loading.
I've been using a Sinclair carbide uniforming tool for small and large rifle primer pockets for 18yrs. Bought the RCBS flash hole uniforming system at same time. Priming seat depth uniformity and flash hole diameter mean more than neck trim uniformity, at least as long as neck doesn't hinder chambering due to extreme OAL.
How do your seat your primers? That can cause more deviation than any effect from not cleaning prior to loading.
I've been using a Sinclair carbide uniforming tool for small and large rifle primer pockets for 18yrs. Bought the RCBS flash hole uniforming system at same time. Priming seat depth uniformity and flash hole diameter mean more than neck trim uniformity, at least as long as neck doesn't hinder chambering due to extreme OAL.