It depends on the company,policy,length of policy,coverage, your age pre existing conditions,etc. You’ll have to seek a quote if you want a correct answer.
PS There are quite a few gun clubs. Many in the Bangkok metro area. If you you know a Thai shooter that has military connections…there are military ranges that you can accompany him for target shooting.
If you have a Thai wife she can own a firearm and bring it to a shooting club where you can shoot trap,skeet or five stand at the club at the Olympic center in Bangkok.