[QUOTE=Corky;6157062]
Its only in the hunt field and only when she’s in single track and is forced to try to hold him back rather than circle him that he curls. Its not a riding/training issue in terms of forward that I can see, its the fact that the little SOB thinks he can pass, even when he can’t. He is never allowed to pass while out hacking and is kept behind another horse, despite his desire to be the leader. He needs to accept that he can’t pass other horses, and to stop trying. Thats why he gets in trouble. He has a hard time accepting her telling him 'no, you CAN’T pass!" [/QUOTE]
I’ve been dealing with the exact same problem on a former polo pony this season. He hears the horn and wants to be in the action, and he WILL climb into someone’s saddle if I ask or physically shove the other horses out of the way with his shoulder if I don’t stop him in time.
We both get frustrated with “no, you can’t pass” <nag, nag, nag> “no, you can’t give that horse a shove under the tail and speed him up” <nag, nag, nag> and I hate having to get in his mouth with frequent half-halts or asking with more than my seat for ‘slower, please’. It easily devolves into a downward spiral with him paying less and less attention to my aids as he gets more frustrated by ‘no, no, no’.
It’s horribly boring and has taken a dozen or so outings, but I told him if he can’t behave and stay where he’s put in faster fields, we’ll have to chug along in the hilltoppers. When he stays politely in line, without curling, rooting, pulling, or head-flinging, I stay completely out of his mouth, cue with my weight, and tell him ‘yes, yes, yes–good boieee!’. When he behaves in the hunt field at the walk/trot, we go in a faster field the next outing. If he gets strong and tries to pass or keeps speeding up and having to be checked to maintain position, it’s ‘nope’ back to boooring until he’s again on an easy rein at the walk and trot a length behind the next horse. It’s paying off–our last hilltopping outing he was on the buckle most of the ride and in second field this week he got a little strong but I didn’t touch the curb rein once, even at the canter with other horses misbehaving. YMMV, but I’ve had very good luck using boring-for-forward-horses group walk-trot rides as a calm forum to make very, very clear what they’re supposed to be doing in a group and in response to my aids (for polo ponies, too–you can’t exactly school a horse properly mid-chukka).
Sorry–I know that’s not strictly a ‘bit’ answer. But I’ve found the bit between the ears can matter more than the hardware. And, for hardware in a hunt field where you can accidentally pull or jab (if, for example, he slips), I really like the main bit/reins to be something the horse packs well and isn’t at all afraid to accept contact so you can collect or steady him as needed. Then, if emergency air brakes may also needed by that particular horse, it’s NBD to carry a second rein across a couple fingers.