I had a 30+ year veteran insurance agent in a CHL class a few years back. He confirmed some of my prior research on the issue. He said that a lot of folks buy an umbrella policy, thinking they are covered with additional "Personal Liability" protection, but those policies can and do often also exclude "intentional acts".
Our range (association) insurance is through the NRA-endorsed carrier and provides up to $50,000 (reimbursement) self defense insurance for CHL members. It is similar to that available through the NRA, but on a "group" basis, not too hard on the budget. Thankfully, no need to use it so far.