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Use "calibers" in a sentence
"I think your chice of calibers is fine as long as you are confident of your skils as a marksman."
"The convention or system for designating cartridge calibers is totally messed up."
"You should have done the ballistic research before asking the question and have ruled out certain calibers and provided your preferences and experience with other calibers at long ranges from 400 to 600 yards."