i buy 40 gram rounds which is the only one my dealer has for sale and minimum round for a deer is 50 gram.
Just as a small point of information, the term commonly used for denoting the weight of a bullet or powder charge (gr
) is an abbreviation of the word 'grain
1 Imperial (Avoirdupois) Pound = 7000grains = 453.5924grams (0.4535924kg)
The '50gram' bullet in the above quote would be 771.62grains.
That's the sort of thing you'd find on the business end of a .50BMG or a .557 Tyrannosaur.
It would undoubtedly be (spectacularly) effective on deer, but I doubt we'll ever see the Parks and Wildlife people requiring it.