I’d head out, s of the Larkhill range, to Figheldean. Cross river, towards Silk Hill, then Old Marlborough Road towards Everleigh. When you meet the road, go across and up to Baden’s Clump. Track left, SWish down in to Enford for a pint at the Swan. Back road to Upavon, then climbs to Casterley Camp. Follow the range road south to Wexland Hanging, then skirt the danger area back to Shrewton.
Good country, ideal gravel riding location. I used to live in the area!
There is live firing for Larkhill this weekend ( https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/713146/20180601-SPTA_Firing_Times_Jun_2018.csv/preview ) but as long as you stick to the right side of the red flags, it’s open access. The red flags are not to be trifled with. Not one little bit. If the flag is up, stay the right side of it. Also, the range wardens are God of all they survey. If they say jump, you jump. They’re universally great people, but their word is law so obey.
Finally, tanks have right of way. Whatever you think.