reloading 350 Remington magnum ..............

[alancthomas]

Information on reloading 350 remington magnum USING Wc 860 surplus powder 200gr and 250 gr bullets , thanks in advance

 

[Centerfire]

Wc860

You might like to put in Wc860 into Google for response to your question.
Centerfire

 

[DavidS]

Information on reloading 350 remington magnum USING Wc 860 surplus powder 200gr and 250 gr bullets , thanks in advance

Based on what I found, WC860 is developed for use in 50 BMG and is similar to H870. Probably much to slow for the 350 Rem Mag.

 

[Dans40X]

OP,
IMR 4895 or IMR4320 burn rate powders are what you seek to reload for the 350 Remington Magnum.