I have everything set up for the coming season with my Thunderhead 125's hitting dead on with my field points. I bought a package of 100gr spitfire "pro series" the other day and am considering using those but can't decide between the Thunderheads or the new Spitfires. Of course the Spitfires hit a little higher but not my much. Total weight of arrow with the Thunderheads is 396gr @ 291fps, with the Spitfires the total weight is 371grs @ 302fps. I have never used mechs. before and I am concerned I won't get complete penetration with the Spitfires. However, I bought them for the large cut. Which would you use and why? I want honest opinions now. Both have excellent groups up to 50yds.

Is 302fps too fast for the Spitfires??