I think that you have chosen a time period when guns were of limited usefulness. Earliest guns at that time would have been matchlocks and powder and probably lead were expensive and probably only came from Europe (at that time period). Matchlocks also required a lot of slow match and my own experience has been that it was difficult to keep the slow match burning. Lucifers (matches) would not be invented until the mid 1800s so that each time your slow match went out, out with the flint and steel to light it again. Wheel locks, apart from being expensive, also depended on iron pyrite to create a spark and in my experience, not all iron pyrite sparks over and above the question of where do you get it. The flintlock was developed in France around 1650 (I think) and was probably expensive enough that mostly the wealthy owned them, at least until you approach 1700. While I think of it, iron was also extremely expensive up until 1854 and the Bessemer process. I think there was a major change in technology between 1600 and 1700 that was much greater than the period from 1700 to about 1860 when another major wave of experiment and change took place with the development of breach loaders and cartridges
cheers mooncoon