Shaft selection help....

[Aggieland]

Here's what i'm wanting to do but I have no idea what spine arrow shaft will work for my setup. Any advice would be great.
I'm wanting to use Vap shafts from Victory archery along with their 43 grain outsert and the Abowyer 260 grain brown bear head. Below is a link to their spine selection chart.  http://www.victoryarchery.com/carbon-arrows/hunting/victory-armour-piercing/
the longbow I'm shooting is 50# draw weight and arrow length will be 29" nock grove to end of shaft.
Total arrow weight should be 515 grains and have pretty high FOC. If I use the .400 spine shafts but I'm not sure what spine will work best. Thanks for any advice.