"The .243 Win is used a lot for Deer Stalking here in the UK. I have never been fond of the .243 and I am hoping that the 6mm Rem will be a beter performer."
Brithunter, if that is the way you feel, you will neve be fond of the 6mm. I don't believe anlyone would ever be able to tell the difference between the two rounds in the field. There is no practical difference between them.
That said, I have been present when at least 20 white tail and mule deer were shot with either a .243 or a 6mm. These are all Saskatchewan deer weighing as much as 250-300 lbs. with an average of likely just under 200.
To say they require proper bullet placement is to state the obvious, but I would not hesitate to use either round on deer half that size. Stick with a good heavy for caliber bullet.
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