Does Ammunition Really Matter that Much?
Although it may seem a waste of time, experimenting with different brands or kinds of ammo can change that gun that earlier was shooting two-inch groups to a tack-driver.
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Facts about the Squirrel Brain Shot
Brain shots definitely do have their advantages — if you do place the shot in the brain, it will immediately kill the squirrel, and it does not tear up the meat. But, in my opinion, harvesting a squirrel immediately most of the time does not outweigh the benefits of harvesting a squirrel quickly all of the time.