clayking
I think the weight of the units I mentioned is a good compromise between a super heavy weight or a sled and something that's still heavy enough to do the job w/o being so bid or so heavy I hate to pack the thing back and forth.
I shoot off of a concrete table with a piece of think woven material thrown on top. With the little screw pins of the front rest down just a tad it is very resistant to moving. The rear bag I use has ears on it. I want the rifle to move so I put a little talc in the front bag and none on the rear. With a semi getting back on target between shots is easy. Any bolt gun is going to require more gyrations.
I'm right handed so with my left hand a reach under the stock and pinch those ears on the rear bag a tad till she's settled on the target and then BRASS. Works well for me.
This design has been a great choice for me and my kids. As I said, my kids shoot off the same setup and once it's dialed it from one weekend to the next they can place it on the bench & get going. No adjustment required as they shoot the same rifles all the time
For me, I might shoot 1/2 dozen different rifles in a day at the range. Most will be rimfire but one or two will be centerfire. It's also not impossible that in one session I might shoot bolt guns, a lever action and break barrel units. I was looking for a sturdy system that was flexible for changes and not constraining as to rifle design. I ended up with the two rest system c/ a good fixed rest in front and a bag behind as a result. I watched a lot of the "old guys" and followed their lead back in the day and that's what they did. Now I qualify as an old guy myself.
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Best
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