Can someone tell me the water capacity of the 284 Winchester cartridge and the 300 WSM or where I can find it ?

The useful case capacity of the .284 is 3.97cc or3.97 gramms of water or 61.14 grains of water.

The win. short mag. is 4.91cc 75.62 grains of H2O roger

Thanks Bart. Do you also have info on the 300 SAUM ? I'm trying to decide which case to build a 6.5 mm with. Thanks, Bill.

300SAUM 4.73cc.If your going for a 6.5mm wildcat use the use the 7mm Win. short mag case and give it a .350" neck length or better. Personally I would go with the ultra mag. case in 6.5 trimmed to a 2.500", a neck .350" long and a 26.5 degree shoulder roger

If it helps, there is a guy with a 6.5WSM he really loves (and loves to talk about) over at

www.shortmags.org

Look in the wildcats forum. I think he owns the tooling to chamber it as well.