Originally Posted by bazookajeff89
so now that i have this .243 and i go to buy rounds for it. there are all kinds of different grain measurements like you guys are saying, possibly a huge beginner question but why wouldn't you just want the highest grain to make it go the fastest, as long as kick isn't an issue?
The grain refers to the mass of the projectile, not the powder charge. The higher grain will actually have a lower muzzle velocity.
Typically, the lighter factory rounds you will find are varmint rounds and should not be used on medium-large game. The heavier rounds will be constructed to hold together better and are better suited to deer sized game.
For just target shooting, use different types and see what your gun likes, but remember, contrary to what you are currently thinking, faster is not always better (and rarely is it 'best').
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