Kosher, Halal and Buddhism If you are a meat eating buddhist, is there any support that eating in this way lessens the karmic impact of consuming meat?
I also was told that Kosher/Halal dealt with dispatching the animal in a way that minimized suffering to the animal. So if eating meat at all had a karmic effect would eating in this way minimize it.

I think that this (the karma of meat-eating) is a doctrine on which different schools of Buddhism differ.

I considered replying to your "dispatching the animal in a way" but remembered that Buddhism considers it:


Wrong to kill
Wrong to counsel (advise) someone else to kill


There are a few "offences" that are so grave that a monk would be expelled or "defeated" -- intentionally killing is one of these grave offenses -- and so is advising someone else to kill.

The end of page 79 of The Buddhist Monastic Code I: The Patimokkha Training Rules Translated and Explained says,


  Again from the
  Vinita-vatthu: A bhikkhu tells an executioner to kill his victims mercifully with a
  single blow, rather than torturing them. The executioner follows his advice and
  the bhikkhu incurs a parajika, for the recommendation to kill mercifully is still a 
  recommendation to kill.


Earlier on page 79, it says it's bad when the killer carries out your detailed instructions (what kind of weapon to use and so on).

My (this) answer is disingenuous because the Patimokkha Rule is actually/only/specifically about killing human beings -- even so I don't suppose you'll find Buddhist doctrine that recommends killing, nor how to kill.

Getting the Message says, in part,


  Killing is never skillful. Stealing, lying, and everything else in the first list are never skillful. When asked if there was anything whose killing he approved of, the Buddha answered that there was only one thing: anger. In no recorded instance did he approve of killing any living being at all. When one of his monks went to an executioner and told the man to kill his victims compassionately, with one blow, rather than torturing them, the Buddha expelled the monk from the Sangha, on the grounds that even the recommendation to kill compassionately is still a recommendation to kill — something he would never condone. If a monk was physically attacked, the Buddha allowed him to strike back in self-defense, but never with the intention to kill.