An interesting retro-macho novel if you can find it is "Dance of the Dwarfs" by Geoffrey Household, probably written in the mid-60s. I'm a sucker for any biological mystery that involves organisms larger than microbes, and this one has zoology,
woo-woo supernaturalism, and early man all mixed up in a plausible tale set in the boonies of South America. A Spanish 16 double and a Lee Enfield sporter figure prominently.
Most fictionists would do well to be very vague about the specifics of firearms or send their MS to one of you guys to edit it....