Chuck Capper Cap Feeders specification should start with the real closure.
Chuck cappers may require accurate cap placement before the chuck descends or engages. The feeder route should be designed around timing, cap position and the way the bottle is controlled during tightening.
For a better buying decision, the useful comparison is not only hopper size or headline speed. It is how the feeder behaves with your closure, how the capper receives the cap and how easy the line is to run after changeover.
The safest specification route is to start with real closures, target output, line photos and the exact point where the cap must be presented. That avoids choosing a feeder on a generic speed figure that does not match the cap or capper.