I good Bench rest style like the Sinclair , Hart and others with the same desgine are all decient choices. I have been playing with several differant desgines both the big base plate style and the tripod style , I have settled on a tripod desgine as its much lighter and I use two differant sets of legs one set has legs that are 18" long each making for a very wide and sturdy base for shooting LR from prone or F-class comps ,these legs have feet with 1.75" long spikes extending down from 2.5" flat disk so it will dig in the ground but not steadly sink ,these are threaded with 4" studs so their plenty of adjustment for uneven ground. I also have a set opf shorter 8" legs with smaller shorter adjustable spikes for bench shooting. This rest uses the 3/4"-10 TPI adjustbment post like all the other big makers use so their tops are interchangable even the Co-Ax style. Here is a pic of the first proto type , I have since changed it so that the middle leg it pointing out front.
Here is a bench style mount that I made and it to is just a proto type and I have made a few changes to the new one also , both of these rest shared a center colume that was the coarse adjustment that supported the fine adjustment via mariners wheel and threaded stud
If you have access to a mill these arn't that hard to make and you can modify them to suit your needs
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