wc powder
I'm not familure with that powder but I use H870 now discontinued ,and 5010 also discontinued.H870 has been listed for .264winmag with heavy bullets,I use it in 7mm mag78-80 grs of it.
I'v loaded Retumbo in 338rum with a flash in every round,I seen that powder on sale so if you dont mind filling the case,maybe compressing,you should be able to use it.It's one of the reasons I started using 870;it was 8.00 a lb. If you find it lacking,good excuse for 6.5 /7mm stw or 6.5rum with a 30 in bl.