YMMV, but most of the people I know, and myself included, look at 1000 ft gained per mile to be an aggressive rate of gain. It’s the kind of steepness that I look for in a training hike, but may avoid during a season. Especially if holding that gain rate for 3 miles, gaining that 3,000 feet is time consuming. It’s a different deal than just doing that for the last 500 or 750 vertical feet to get to a glassing knob or ridge that’s adjacent to a main trail.
Example: I did a 3 mile/3k feet hike on a trail for spring bear and it took 3 hours of hiking and a 30 minute break in the middle with a day pack on. That was to get from 3800’ to 6800’ (I do cardio 2-3 times a week for the last year and have trimmed myself down to an acceptable BMI in this last year).
Another thing I keep in mind- steep hikes mean steep country. If a hike is that steep, it may mean that any game I spot off of or beyond my trail could be exceedingly difficult to get to, and navigating off trail could be an issue. Harder to hunt, but not impossible.
If you have the time and the opportunity, I say give it a go. It’s good to push yourself, you will learn a lot, and it will help you plan future hunts and hikes.