I have shot lots of nickles plated brass in Rifles from 223- 338 Win Mag. One most always work the load up to your best pet load in Nickle brass from your standard brass loads. The outside of the case being plated will change the pressures when loaded. Sometimes as little as half grain lighter to as much as a grain and half lighter. It has never made my rifles group shoot diffrent when they were loaded to the same speed. The cases do seem to heat up faster when left laying in the sun. So I load them with extream powders. Also they show up better in the grass. Hopes this helps.
