What is the difference between the redfield 3200 and the 4200?  Thanks, Hank   

The biggest problem with them is not the scope, theya re great, but the mounting setup. The main issue I have experienced with the excellent 6400 (OR the similar unertl Bl-50) is that it is a shorter tube/eye relief scope. In that way it is like  it wont fit between the normal target scope block, of if it does it is way too forward to see through.  THis makes them slightly less desirable, in our circles,  than the more "traditional-class" scopes.
If mounted on a system that cantilevers the scope back into eye relief range it can present problems getting the cartridge into the chamber on high-sided actions--and really complexicates using lever type breach-seaters.
Obviously this impacts some actions/cartridges more than others. Using a higher mounted scope gives more clearance and shooting fixed ammo helps too.  I plan on using one on a non-traditional-class offhand rifle with fixed ammo.

not sure,   maybe its just my eyes.  then too it was a couple years ago  I tried them.   neither one fitted right for me and I had more trouble with the 6400 than the Unertl.   Are you using them on breach-seating type rifles?

My guess I was trying to use the holes that were predrilled in the barrel---two far apart and to far forward

Thanks for posting the pictures,  Ken nailed the problem on the head.  All I'd need to do is make an extra long weaver-type rail or set of long blocks that fit the "traditional" scope block spacing and are thick enough and then milled to cantilever the back scope ring over the action.

Note that Ken said IF,   Ken knows the rifles I'm talking about, and no more holes is a rule for me,  Now on the Ruger Schuetzen I'm slowly working on I'll have no problem at all using my 6400.

But to get back to the original poster's question it is the problem of mounting these scopes on traditional rifles without drilling that keeps some guys from using the short scopes--and the prices down--relatively.  I know several guys who were shooting original German schuetzens who unloaded 6400's at very reasonable prices because they could not adapt them to the dovetail rails. 
Mounting a long weaver blocks to the top of one of Steve Earle's so you can move the scope back would solve the problem.  However if one cares to shoot the rifle in the ASSRA "traditional" class one generally uses an outside adjust scope.  If you are going to be shooting modern single shots there are more modern scopes that are more advanced tech-wise.   As a result there is a pretty narrow market for these scopes, which also tends to keep the price down.  At EG , over they years, I have seen more of them go home with the seller than with a new owner

Another option is a Davidson base blank ( from Sinclair) 7" long. (You need to Login or Register to view media files and links)
It would require a Kelby type (from Sinclair) 1" rings. The base blank is flat bottom.  It would fit nice on a octagon flat. You might also find other type base stock  for different rings  from Brownells.
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  If your barrel is drilled for a Unertl type scope, you could probably pick up 3 screw holes.  I test rifles by using double sided tape and similar one piece 10" long base  with two 3/8" dovetail  Unertl style bases milled on it. Warning, I use a couple of wraps of tape around the base and forend as security in the double sided tape releases.  
Kurt   

That "Black Magic"  sounds like a great idea, but just how good does it hold, have you tried it on something like a 32-40 ?.
  Harry