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I grew up in the Brantford - Galt area over 50 years ago, and Ground Hogs were one of my favorite varmints. Usually, about 20 a day was a good shoot.
Last year, I went back to visit for about 10 days, did a lot of touring around, and I don't think I saw 20 all that time.
Also, Civilization, (if you really want to call some of those people wandering around Civilized,) has encroached many of the areas where the Ground Hog population was thick, and houses are being built all over the place. I think today I would take a smaller .22, such as a Hornet or .222 because of the noise factor on the locals.

Loud noises = lots of danger, especially if you are located near Jane and Finch in Toronto.
It definitely is not like the Prairie Provinces, with hordes of Gophers, thousands of wide open acres of land, and Farmers who welcome you when you ask to shoot Gophers on their land. On a good shooting day here, you do not come back with many rounds left out of a brick of .22 rimfires.
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