The brass catchers I've used wouldn't affect your grip at all because you don't attach them to your hand...
I'd build one out of 1/2" PVC pipe and a piece of canvas. That's what we used to have at the indoor range I belonged to. Just set it up so it catches most of the brass and what it misses is deflected back instead of forward.
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Nobody plans to screw up their lives...
...they just don't plan not to.
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