Mike,
Therin lies the rub. If one wants to try EFOC arrows, which really wasn't what I was after, I don't know any easy way to get there except purposely select the lightest arrow you can find within your spine range and then cut it down to where it shows so stiff that you have to add excessive point weight, which I think most folks would consider 200-300 gr. (or more if using a heavy insert). I used to hate excess arrow length and now I prefer it hands down. It hurts nothing(except prevents attaining EFOC stiffness)and has the added benefit of usually bringing the point-on difference into a reasonable 30-40 yds. that you may actually encounter a 3-D target at. I agree that 500-550 would be a good all-around hunting weight arrow, but there's no way I can get it in my .500's without cutting them to where I'd need 250+ gr. heads. Everybody knows what a pain it is to pull those oversized tapered field points out of 3-D targets, so you're relegated to competition and hunting arrows with vastly different trajectories. One can purposely select the next stiffer spine and go from there, which was my intent, I just didn't realize how much heavier the GT HH's were. The standard weight .400's in my test kit flew fine full length with 175gr. heads, but I think this would have only gotten me in the mid 400's total weight range.