I have a couple of those around too. Lets the brass cool nicely but I have to adjust mine every few rounds.Having been "the shooter to the right" I can appreciate that too. In addition to assisting in diagnosing loads as AppacheCo states, those help keep factory brass - which may have crimped primer pockets, separate from reloaded brass that has had the primer pockets "de-crimped",
I bought a brass catcher that attaches with velcro around the handguard. It has a zipper on the bottom that I usually leave open when I shoot off a bench. This allows the brass to fall through and land in a little pile next to the rifle.
I gave my Caldwell to my buddy, it was one of the velcro strap on ones...didn't really like it, but it did work well.I'm using a Caldwell, but you have to have space on the rail for th mount. It can be nearly anywhere on the rail, so that's good, but it has to be there. I got a couple of spare mounts to put on different ARs and swap the bag around.
I have a couple of those around too. Lets the brass cool nicely but I have to adjust mine every few rounds.
I do exactly the same thing.I'm using a Caldwell, but you have to have space on the rail for th mount. It can be nearly anywhere on the rail, so that's good, but it has to be there. I got a couple of spare mounts to put on different ARs and swap the bag around.