Considered the most stable of shooting positions, I can't do prone. Never have even before my waistline began growing. I can't breath, can't crank my neck up to get head in proper position and my elbows roll around like they are on ball bearings. I prefer sitting with elbows locked between the knees. Also, I see no advantage to prone, most places (other than ranges) will have grass or whatever that will block your view.
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