310 Redirect? You lose about 15% Link Juice

One of our accidental tests involved regularly 301-redirecting large batches (i.e., tens of thousands) of product pages. On average, we found a consistent (and essentially permanent) traffic loss of about 15% for 301-redirected URLs. https://moz.com/ugc/accidental-seo-tests-how-301-redirects-are-likely-impacting-your-brand