FYI........the Hodgdon/IMR/Winchester reloading data center web site http://www.hodgdon.com/index.html now lists reloading data for several calibers of Berry's plated bullets. The abbreviation for Berry's Bullets on their site is BERB.
Up until now, about the only printed guidance on powder charges for plated bullets was "use data for lead bullets".
Up until now, about the only printed guidance on powder charges for plated bullets was "use data for lead bullets".