.22 calibre vs .22-calibre

.22 calibre and .22-calibre both are adjectives.

Word	Noun	Adjective	Verb	Adverb
.22 calibre	No	Yes	No	No
.22-calibre	No	Yes	No	No

As adjectives, .22 calibre and .22-calibre are synonyms defined as:

.22 calibre and .22-calibre: of or relating to the bore of a gun (or its ammunition) that measures twenty-two hundredths of an inch in diameter

Other synonyms of .22 calibre include .22-caliber, .22 caliber.

.22 calibre (adjective)	.22-calibre (adjective)
of or relating to the bore of a gun (or its ammunition) that measures twenty-two hundredths of an inch in diameter	of or relating to the bore of a gun (or its ammunition) that measures twenty-two hundredths of an inch in diameter