There are a lot of variables .....so this is strictly a guess but I believe you' ll be shooting about 231 fps and your arrow if it has a 100 grn point ,vanes, @ 29" will be about 519 grns . This should give you about 61 # of KE which is enough for mechanicals. But like I said......at those speeds why would you want expandables ? Fixed blades should fly just like your field points , provided your bow is well tuned !
I like Spitfires a lot , but I went to them because I had a hard time getting fixed blades to fly good at 290 + fps ! At 260-265 fps I can get fixed blades to stack all day long !
If you want to play around with numbers go to bowjackson.com and you can probably come up with some close numbers for your equipment !