Stockerman,  I've been using a "sled" for the past year.   I find that the added "3-point" stance adds a LOT of stability over a v or u-notch front bag.

However I have not done a lot of breech seating yet, and most of my euroschuetzens are martini actions which present "issues" for breech seating to start with.  I'll be doing a lot more with the CF rifles this season now that they have pretty much all been repaired and are ready to go.

However my 22rf has a tight enough chamber that I have to use a "pusher" to seat the 22f rounds it seems to prefer and the muzzle rest adds a lot of stability to the process

doing some research

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worth reading there are dded discussion on the BR sites.   
I'm now the proud owner of a keg of 80 grit garnet sandblasting sand courtesy of a local farm/industrial supply

yup!!!     it is by a long shot the "best buy"  (IMHO)  there is some other stuff (the "Zircon") that is slightly heavier but a hell of a lot more expensive--plus the shipping charges.

the bench rest sites have a lot of heavy bathing and blather over bags and sand.   it ws some pretty edu-taining reading.

As is trying to find a way to maximize the setup for use with the "full-figured" offhand-rifles as opposed to the dedicated bench-rest rifles.

I have no intention of using this bag in an attempt to use my Euro-schuetzens in benchrest competition.    I simply wanted to see if a modified bag would be of assistance to me in my load development and evaluation in the process of becoming a better offhand shooter.  My perception was that my existing bags were inducing a fair degree of error as the rifle recoiled.   They may prove to be of little value or them may need further development---after all a lot of then is in the journey.

JLouis wrote on Apr 16^th, 2015 at 10:17pm:


Exactly...

Terry

I already have a perfectly good front rest with several different style front bags and made a flat-top 2 years ago for use with a muzzle rest; as well as several different rear bags.  However I perceived that the rear bag might be modified to work better, specifically with my German and Swiss offhand rifles.  time will tell.   

JL:   I don't disagree with you, accuracy IS! 
  however my personal area of interest is in shooting a specific type of traditional rifle in the context of offhand matches.   absolutely no disrespect  intended to the guys shooting benchrest matches at all, but that is not my main area of interest.  My efforts off the bench are just a means to a different end goal.  I had been told by a number of shooters when I first joined the ASSRA that the old German GI souvenir rifles were neat but just "non-competitive" and being somewhat of a contrarian I have always wondered why.
I have come late to the offhand game, too late in life I fear, to become really competitive, so I consider myself more of a recreational shooter.  If I had more time and competitive drive I'd probably be shooting an offhand stocked Miller in one of the hot rod 32 short rounds.

I admire your drive to design a new rear bag and it is my hopes it is a big benefit for you, it surely can't harm trying. I designed a new front bag several years back as I have returned to shooting off the barrel and a Traditional scope. David at Protektor built it to my deminsions based on our phone conversation. It was done right and just as I described it. I had it in my hands in a week and I might also add that it not only turned out right I have found it to work very well per my thoughts going into it. As you I highly recommend their custom work and it is very reasonable as well. If memory serves me right it was well under 60.00 filled and delivered to my door.

Wish you the best.
JLouis