How are you getting the bullet releasing at the top of the stroke? That's like the opposite physical direction from the bullet falling out... Not being a smart ass but just in my confusion with this how are you using the thing? They are pretty much designed for you to hold them up in the sky with your wrist cocked at an angle and then flick down as fast as you can so the bullet has a lot of momentum when the puller head stops on whatever you are using as a stop block. There's no point doing a huge backswing, it just wastes energy (unless you have surplus and are trying to teach the miscreant bullet a lesson). Obvious factor, the heavier the pill the more effective the inertia pullers are as the more grains, the more energy they have at the sudden stop.
Better than an earplug, a round of closed cell foam cut to the right size with a wad punch or similar and pushed into your puller head will help I think and seal things up so you don't get powder everywhere.
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