Where are you bailing? Are you unable to catch it, or are you losing it on the way up after catching it?
If you're losing it on the way up after catching it, there are a couple of things to look at. If your weight is on your toes instead of your heels, it's going to cause you lean forward and possibly dump the bar. Also, if you have the bar on your wrists with your forearms vertical instead of racked on your shoulders with your elbows high and in front, it's tough to apply power properly, and the bar will want to roll forward. Either way, improving oyur front squat should fix this for you.
If you're having problems actually catching the bar, it's likely that how you're whipping your elbows around is throwing you off. If it looks more like a reverse curl, than the bar gets swing forward and away from the body. When this happens, you have trouble getting underneath the bar, and even if you do, the bar is moving away from you causing oyu to lose it forward.
The movement should look more like a high pull to chin height and than whipping the elbows around and up. This will place the bar on your shoulders and keep the bar from moving away from the body. Think of pulling yourself down to the bar. It's kind of hard to explain unless you see it in person.
There are a couple of useful drills to help you learn this movement.
1. Take an empty bar and practice the high pull. Focus on popping the hips and pulling the bar as high as you can. Do this for 10 reps or so until you have the feel.
2. Hold the bar at chin height (top of the high pull) and roll your elbows around the bar so that it comes to rest on your shoulders. The bar should barely move. For all intents and purposes, it should be stationary as your elbows roll around it. Get comfortable with that. Again, 10 reps or so.
3. Now, integrate the pull with the drop under the bar. As soon as your hips open, PULL yourself down to the bar with elbows high. Don't waorry about the catch. Again 10 reps.
4. Do the same thing, but this time add the elbow whip around. This is the most technical drill yet. Do sets of 2-3 and focus on proper technique. You're learning movement patterns here, so be fresh mentally and physically. If you have a bad rep, stop and refocus.
5. Now for a fun one. Put 95lbs on the bar. Hold it at full extension. You don't need to be on your toes. That happens more from exploding hard from your heels rather than actually shifting weight to your toes. Just makes sure your hips are open, and you're at a full shrug. Now, WITHOUT USING ANY HIP DRIVE, drop under the bar and catch it. Your goal is to be pulling yourself under the bar so fast that you beat gravity.The bar shouldn't drop much. The reason for using weight in this drill is so that you cna't cheat the weight up with the high pull portion of the movement. If you find yourself pulling the weight up so you cna get under it, try increasing the load until you're forced to pull under it.
