They are fun to play with, and many years back there was enough difference in Rim thickness to make sorting target ammo that way make sense. Today, if you are shooting any version of Target ammo you won't find any differences in Rim thickness. If you are using this on commercial ammo like Rem Thunderbolts, variations in Rim thickness is the least of your worries. You can shrink groups a little but it isn't going to make it into Eley Tenex. It is much more effective to just buy better ammo.
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