Randy that pretty well sums it up.  I was thinking that the sled was in some kind of a rail but now I see it rests on the wooden block and like you state the rear bag keeps you inline.  I assume that the wooden block is bolted to the top of the rest.  Next question, is wood better than say a miniature cutting board of delrin?  Outside of the manufacturer listed above, where else might I find a sled?  I have a Borchardt and a Rolling Block with heavy contour barrels in 219 Zipper and 250 Savage that I can start practicing on until I find a dedicated rifle.  Many thanks guys.  Tom

Joe, If I try to concentrate on the loud and fuzzy stuff, how will I know when the rifle goes off?

Tom if you have access to a lathe you can very easily make a sled like the one I pictured. I also now have several different size Delrin bushings for the various barrel diameters I now have. They also keep the barrel from being scratched / damaged. All though I don't use it anymore it is something I will probably hang onto or I would offer it to you.

I might add that the sled rides on two pieces of 1/8" thick by 3/4" wide Delrin strips adhered to the rest top. The thought not only being the freedom of the sled being able to move during recoil but also to have only the outside edges bearing should there be any bowing of the sled when tourqed down on the barrel. The only regret I have is I put the recessed retaining screws coming up from the bottom so it would look pretty / no screws visible but its a pain in the behind to level the rifle on the restas I can't close my gun case without rotating it 90 degrees.

JLouis

Joe I try to watch the bullet going through the target. Not really possible with my setup but it keeps my head down long after the bullet left the bore. I see alot of competitors who can't get to their spotting scope fast enough to see where their shot went once they yank on the trigger and in doing so its generaly not very pretty.

The lighting needs to be just right but I can see my .25 bullets on the way to the target some days. I never really see them go through the target though, but can get a pretty good idea of where the hole will be. 

Follow through is the key.

JerryH

Joking aside, I have never seen a bullet hit at a hundred. I have seen the crap fly off the backside of the target backer, now and then. Through scopes, with slow bullets, not modern stuff.

I have been shooting pretty much euro-schuetzens and their stocks with the extreme drop and the rather massive protruding cheek-peices do present problems when shooting off the bags. I found that my existing bags were too short and had the wrong angle and I had to make a wooden wedge to go under them to position them anywhere near properly. and the front rabbit-ear would hit the bottom of the cheek-piece on recoil--even with a solid shoulder and grip just like I would hold when shooting offhand.  So over the winter I had Protektor create a special rear bag for me.  It is considerably taller at the base and has much more of a slope to accommodate the lower line of the germanic stock.  in addition is has longer ears, with a taller "rabbit-ear" on the back side and a much shorter "bunny-ear" on the front.  
 used in combination with a muzzle rest similar in functional design to RWS's on a delrin plate mounted in the "jaws" of my front rest it provides a great amount of stability that was lacking with my previous setup. Note too that the front rest is elevated considerably to provide clearance for the butt prong.  I also allows me to position my face "in" the rifle almost exactly like I do when shooting offhand.  without the muzzle rest the rifle would be exceedingly unstable.   
 I'm working on load development but I think the bench rest set up is working as I want. I'm not a benchrest shooter and this is mostly for developing and experimenting with potential offhand loads.   
At some point I may do a minor modification on another bag with a slightly wider "gutter" between the two ears.