Guns and deaths or guns and homicides?
The guns per capita source and HDI source are listed here:
I’m not trying to argue, but I’d like to see your data and what you put together. If you and I are tackling the same question and coming up with different answers, then speaking meaningfully about the data is a way for us both to learn. I definitely agree with you that .8 is a very strong correlation. .6 or .7 would be pretty good correlation in this space IMO.