Remembering that with the DL (regular, one hand or one finger ((one finger lifts were very popular back in the day)) the hand/arm is only holding the bar as the larger, stronger leg/hip/back muscles do all the hoisting up. Your not pulling the bar up with the arm, only holding the bar in position.
A lifter who practices the DL seriously , including the one arm version in workouts, should be able to DL in a respectable range of his best 2 handed lift. If a lifters best DL is 500lbs, that the one arm version should be at least 420lb, maybe more. I give that in the "almost" range.
Two different styles in one arm DL'ing. One is with the free hand (the one not gripping the bar) usually out and away from the body. The second style is with the free hand holding, and/or pressing down on one of the knees/lower quads. That would be bracing the body while preforming the lift, and usually not allowed in a meet. Depends on the meets rules, they can vary.
Two different ways when gripping.. One with no strap (free handed). The other with a strap. One hand lifts seem to improve the hand grip much quicker and stronger than the two hand version does. Of course, that would only seem logical. If men focused more on gripping power, they would surly amaze themselves as just how strong they really are. Suggest also with a thicker bar, and just hold the bar in place with an extra heavy load on it. Try seeing how long the bar can be held. 10 to 20 seconds as a start. Next workout, add more weight to the bar. Should gain strength fairly fast.
As a teenager, reading about Hermann Goerner with a 700 plus one arm DL....some said his top record was near 800..but no offical record. And some of his unbelievable gripping lift. Those old timers were strongman freaks, without a doubt. Ate a lot of beef and drank a lot of beer..the good old days, I guess. If taking the time to do a search, sure there are a lot of examples of DL's and DL raw power...two handed or one.
Good Luck.
