Longbow338 - I'd be looking at the 0.200" spine class arrows. So the Gold Tip Big Game Kinetics @0.200" spine would be a good choice, also Carbon Tech Safaris are 0.200" shafts. It all depends on what F.O.C. and overall weight you'd like to be at... The Gold Tip Kinetics are 11.6grains per inch and the Carbon Tech Safaris are 15.5grains per inch. Either one of those shafts with a 50grain insert & your 300grain Big Jims @29.25" with standard fletching will be pretty close. The assumption was you were pulling 28" draw. The key here is to get somewhere in this 0.200" spine deflection, unless you want to "foot" the front end as already suggested. Footing will take a little more tweaking to get it dialed in... I'm not aware of the full 0.200" spine class offerings from other manufactuers. Happy to help if I can...