I've recently installed a Timney Featherweight in a Mauser 98. I'm having troubles where when the bolt is cammed down and the trigger pulled, the sear won't drop away from the cocking piece. I've switched out the trigger for a Timney Sportsman and everything works just fine. So I know the gun is ok. Could it be something with the shape of the sear? The Featherweight is slightly squared in the front and the Sportsman is rounded in the front. Or could it maybe be to do with sear height and engaging too early?