I've been guiding moose hunters for 30 plus years. Judging exact width isn't easy, but judging 50 or better is pretty easy with some experience. A couple of years ago I had a hunter that had hunted in AK the year before he came to the Yukon. He was in a 50 or better area on his AK hunt and didnt get a moose. He saw lots of bulls but his guide wouldn't let him shoot because he was unsure. The guy showed me some pictures of the bulls they passed up and some were easily over 60, let alone 50. The first thing I do is look at the palms. They should look like they are facing you if the moose is looking your way. If the palms themselves have decent width and they are facing towards the front, the bull is over 50. If the palms are "cupped" facing towards each other, then slow up and take a better look. The thing to remember is width by itself doesn't make a good bull....mass and palm length are far more important. Where I hunt we don't have a width restriction; any bull is legal. When I judge moose for a client, I give them a rough score idea. Anything over 185-190 is a shooter.....anywhere. I've taken a lot of moose in the low 50s that scored over 200. Another trick I use is to quickly count points if I can. A bull with a lot of points is almost always a good bull. The area I hunt is thick, you often have just seconds to make a decision so every trick helps. The two pictures below are good examples. The first bulls horns are cupped, the second bulls palms are flat, they looked like they were facing forward when the bull looked at us if that makes sense. The first bull scored 180 and the second went 206 and was 58 wide.