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I have a new MEC Grabber and reloading Rem hulls. I get 5-10 out of 100 reloads that won't go into SxS gun. It is a 2 1/2" chamber gun but I think the brass isn't resizing enough or my chamber rims aren't cut big enough.
Anyone ever have similar problem?

This. The grabber is basically a 9000 that you have to rotate by hand. Everything else on the new ones is the same between them. The old Grabbers would not resize high brass shells but that was when they first came out years ago.

I only own 9000's one of the 12's is setup with one of Ben's first automates that MEC purchased the patent for and became the 9000E.

Shooting multiple guns in different gauges I resize all shells for the smallest chamber in that gauge that I own. During the ammo shortage last few years I have loaded for others and a few of them have had problems with my shells not fitting in their guns, mainly older SxS guns. I don't resize any smaller than I have to. When reloading for myself.

MEC has youtube videos for pretty much any adjustment or problem you run into. You can also call them they are great at helping you if you need it. Here is the video on how to adjust the resizing die on a Grabber and 9000.

[video:youtube][/video]

Cold Iron's point is pertinent regarding shooting multiple guns which fire forms the head to the largest diameter chamber. The MEC ring falls behind the collet system of the Sizemaster and MEC presses that utilize a collet system. My 10 ga. MEC press uses the collet system. My Ponsness Warren 375 C uses a full length die which resizes not only the "brass" head and shell rim, but also holds the entire shell length exposing 3/16" of hull outside the die for crimping. This prevents hull buckling. In developing loads for my 2" 12 ga. guns, I test fire them in an 870 pump which requires hull resizing for my doubles. I use a full length die which rides on a Manufrance assembly that de-primes, primes and resizes with the two tools lying to the right of the screw-press. The smallest diameter tool contains a removable de-priming pin. Note the far end of the press on which sits a three leaf metal tool which fits in a slot. The small hole allows the spent primer to pass through, the flat side primes and the large hole ejects the primed and resized hull. Slower than the MEC collet system, but I don't do high volume loading for the 2" shells. Gil