https://www.uspeacekeeper.com/collec...shooting-mat-1#
I use this super comfortable mat when we do our LR Rifle, steel shoots. As well as for prairie dog shoots. A set of elbow pads worth their weight in gold too.
Midway sells a similar mat, as well as thinner, "Tactical" versions. Nothing like being COMFORTABLE when prone. Helps your accuracy more than one thinks.