/johnny
“mostly ash”
Don’t be so dismissive of volcanic ash in quantity. For instance, how does nearly 5 feet of Stone ash (per square foot) falling in your area compare in weight to 5 feet of Paper ash as in lies on your roof - before it rains?
Also any Yellowstone eruption could go on for weeks or months ... especially now that the magma chamber is twice as large as previously thought.
Mt. St. Helens was a five on the Volcanic Explosive Index, while Yellowstone would be a 10 or 1000 times larger, lasting a minimum of days to months of eruption, compared to St Helens minutes.
It really will not mater how far away one is, most will die one way or another (since it would be a world-wide disaster) ... from immediate effects, starvation, disease, lack of any civil structure, and so on. Guns will be mostly useless for hunting as there will be little game to hunt.
Be sure to stock your southern bunker with seveal years of water, food, and air for you and yours, as well as a jack hammer (with fuel and some where to vent the exhaust fumes) to break through the some feet of ash turned to concrete and a power supply for light, and so forth.
Pray to G_D, He holds it off for another 1000 years or more - but then He’s held it off for longer than average now ... in other words, an eruption is over due ...