I solved my problem with takeing a Bob Allen (that's what I had) 12/20 ga. shell belt, holds 25 rounds, and I cut the belt at and through every 6th loop. Yea, I cringed at the idea at fisrt also! I ended up with 4 (four) holders that each held 5 (five) rounds.
With my hunting coat on, I took my right hand and placed it on my chest, left pec., much like what you do when saying The Pledge of Allegiance. I shoot right handed, reverse this process if a southpaw. At that spot and at that angle I marked the garment and sewed the piece of belting there. When you cut at every 6th loop, this will give you 1/2 of a loop to sew/work with at each end.
On the coat, at the mark's, I also put some "TEAR MENDER adhesive made by VAL-A of Chacago" (that's what I had) and also some on the back of the belting. I placed the belt on the spot, pressed/weighted it down and waited for it to dry, 2-3 hrs. and then sewed the corners down. I sometimes, firmly believe in overkill. It will not rip away!
I was so pleased with how well this worked, I also did my light weight jacket and even lighter vest to acommodate several types of weather.
Simple, affective and most of all HANDY!!! I did all 3 pieces at a cost of about $10.00.
I am not endorseing the above mentioned Brand named products, that was what I had to use.
George