Remember, the advertised FPS is for a 30" draw, 70# rig of light arrow (whatever the IBO spec is).
If you don't draw 30" (and or run a heavier hunting arrow) you may not hit 300 FPS.
FPS and KE..................there's also this thing called Momentum
I blow through deer with 480 gr arrows at under 200 FPS. My FOC is close to 20% and paper tune shows my arrows flying perfectly. Recurve.............blow through deer with big 3 blade heads............and some guys shooting modern gear, fast stuff..............with light arrows and mechanical heads.............don't blow through and or lose deer. It aint all about speed.
But that's something easy to measure and put in an advertisement or on a hang tag. It is of some valid measure, since it does compare setups across brands/models.
Doesn't matter the speed of cost, if it isn't tuned right or doesn't fit you. Deer don't care how much you spend
My decent spec Hoyt from 2005 shot a 430 gr arrow at 272 FPS and I thought that fast enough.
Blew through the deer with ease. Target and hunting bow combined, it was not cheap and was forgiving, considering the speed it had. It was also quiet, and adjusted to fit me perfectly (I prefer 35+ inch axle to axle for less acute string angle. I don't like leaning in to get my nose on the string, and using a string loop for bows of lesser axle to axle, changed my long established and super repeatable anchor point.
The PSE Stinger sells out every year at my local pro shop. It allows for wide adjustment in draw length without needing modules. It's fast enough and quiet enough................no wonder it's popular.
The grip on the PSE's I don't care for though. And I'm no fan of single cams or let off over 65% (since I like more back tension, grew up shooting less let off stuff- and I subscribe to the older P&Y rules).
A good shop should have a demo bow for you to try. With the stuff that adjusts without need of a bowpress..............shouldn't take but 5 minutes to get you fitted for testing.
Many of the new hot rod bows at 60 # draw so rough they hurt me. Yet I can draw higher # rigs of lesser letoff much easier, due to how I am built, how I have trained my muscles. There's a reason lighter # rigs get hot speeds............and it comes at a wicked draw force curve.
You don't need 70# these days. But if you want it, yeah...........hot rods are fun
Just remember nothing comes without a cost.
Speed means more wear and tear, stuff coming loose. Not uncommon for guys to shoot shoot shoot before hunting season....never have any issues........... and then have sights/quivers and or rests have problems............usually when they take the first shot on deer.
Murphy (as in Murphy's Law) was a bowhunter.