OK everyone, after months of doing "honey dos" around the house, I finally got to shoot my hunting arrows through my chronograph this past week to check the speed. Just to get everyone up to date, I got a nearly complete rebuild of my 08 Firecat earlier this year with Martin doing all this under warranty even though they didn't have to. I got new Nitro 3 cams, new limbs (1-1/2" wide the whole length), new roto-cups, new cables and string and it's shooting nicely as far as the draw cycle and accuracy are concerned. However, the arrow speeds are down from when it had the original CAT cams and limbs. It used to shoot my almost 500-gr arrows consistently at 262 fps with a tad over 64-lb DW and 29" DL. The DL is still the same but at 65-lb DW the speed is now down to 255 fps - a drop of 7 fps. I had to crank the DW up to 69+ lbs to get 261 fps. I can shoot it OK at that DW but I'd rather have it around 65 +/- with the speeds like it used to have. With that in mind I've been wondering whether I could get some or all of the speed back by replacing the limbs with Barnsdale limbs. I know they're supposed to be super reliable but I thought I had read somewhere that some shooters had gotten better speeds by simply replacing their Martin limbs with Barnsdale limbs with equivalent DW. So, has anyone this forum had any experience like this or am I just dreaming?