Do I choose small or large rifle primers?
We offer both large and small rifle primer options where applicable. If your rifle was custom built and utilizes a small or medium firing pin on a custom action, then you may want to use small rifle primed brass. This is clearly a personal decision and in our testing offers no visible accuracy boost. However, using small primers with a medium or large firing pin, or a firing pin with excessive slop in the firing pin hole can cause premature primer failures such as pierced primers. We recommend shooting large rifle primed brass in these situations to ensure your safety and to not cause any damage to your firearm.
You can read more about primer issues with pictures of those examples in our article on primers here.