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COAL is the big limitation, and the plastic tip changes my SD. Sounds like the best starting point.

I am about to finally begin working up 225 gain loads for my .300 WSM model 70 (many thanks to those whose advice helped in getting it back). The nearest data that i can find is 220 grain round nose loads from Hodgdon. When I called them to ask, they thought that using their 220 grain data as a starting point seemed reasonable. I also intend to seat these long and may gain some powder capacity that way. Barrel is a 28" 1-10" Bartlein. I plan to try 4831 and H1000,both Hodgdon Extreme series powders. Bullet,as per title,is the Hornady .308 225 grain ELD Match.

If I am the guinea pig then so be it. However, if anyone else has been there first, I'd love to share their experience.