Here is a picture progression from 25 round to 10 round, in 5 round increments (including a 10 round with Taran Tactical +5 plate). The bipod is a Harris pattern 9-12”.
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Note that on the lowest setting of the bipod, the rifle rests on the 25 round mag, but on the butt of the rifle for the others. I have to admit that the 25 round mag looks the coolest, but is impractical for a bench/prone gun.
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With a 9” maximum for bipod height, my experience has been that the 15 round magazine is the best compromise of capacity and convenience.
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Note that if you max out the height of the bipod, there is room for the mag to drop free. I pulled a scope off of another rifle and asked the question, “Can I comfortably shoot the gun from prone with the bipod that high?” The answer is no for me and my build (5’11”, 160lb). There is too much arch in my back, and the gun is still angled slightly up even when I am uncomfortably torqued to bring the muzzle down. You may have a different experience if your build requires you to have a taller bipod.