What kind of groups should I expect when shooting stop ring bullets in my 8.15x46r?
I have only tried one load so far (13.5 gr sr4759) with groups of 15/16 to 1 1/4 at 95yds (that's all I have in my back yard).
I used 2 alloys 15-1 and a hard mix of ww and lino.
The hard bullets shot best, I only tried this alloy because it was in my pot.
I do not have any softer alloys made up, but I have heard that they work best in these rifles. Can expect much better groups if I try softer bullets or a dif. load?

Dale

The mould is from NOE. They only list the one stop ring.
It is a good fit in my rifle ,nose tight in throat and stop ring is tight in the area just a head of the case, I cut case to a length to push 1/2 of stop ring into the ball seat.
Dale

You CAN shoot "these rifles" in any ASSRA centerfire bench rest match----perfectly legally. Will they outshoot a dedicated full-race modern tech bench rest rifle.   Probably not.  That'd be like expecting a road racing sports car to compete against a top-fuel dragster in 1/4 mile elapsed time racing.  Can you imagine shooting a consistently top ranking bench rests shooter trying to use his bench rig in a 100 shot offhand match.
They ARE a little more difficult to shoot off the bench; after all their stocks were designed for offhand shootingl. 
if you were to replace the forend and buttstock with modern design bench rest wood and use modern design breach-seated bullets you just might be amazed at the accuracy.   
  All that said, with a properly designed and adjusted bench rest set up for the offhand stock; and quality loads using bullets that are designed to fit the specific chamber and throat; I believe they should be capable of better accuracy than their commonly-held reputation allows.
I'm personally convinced that the limiting factor has been the paucity of selection of stop-ring bullets for the wide range of basically custom built rifles we are trying to use them in.

Putting all 10 shots in the inch and a half 25 ring on a 200 yd ASSRA target requires roughly 3/4 MOA accuracy.  Keeping them in the 3-inch 24 ring requires about a 1 1/2 MOA accuracy.  Shooting all 23s (4 1/2") would be about 2 1/4 MOA I think.   
I'd like to think that with the right bullet,( yes a stop ring design) a well set up (and managed) 8.15mm offhand euro-schuetzen rifle should be capable of 2 or 2 1/2 MOA or possibly better.

Obviously I am talking about bench-rest accuracy here.

I just got this rifle and this is the first time I have tried a stop ring bullet. I did not know what to expect from this type of bullet. I had a German rifle years ago and shot it with a breach seated bullet and it would stay within 1.25 MOA.
It would seem that this possible with the stop ring which is a good thing as this is a martini action and hard to breach seat.
The barrel on this rifle has a male dovetail on the bottom near the muzzle which may be for bench shooting. I will try to mill a 3" plate for a barrel rest and try to find out how good a stop ring will shoot.
Has anyone tried a stop ring bullet in a 32-40?

Have tried the Zika stop ring bullets in one of my 32-40s. Didn't test from the bench, Seemed to be about the same accuracy as the Aydt and Stahl rifles.  Would have no problem using it in offhand matches. No loading at the bench. Oh dear, all this time............what to do?

Have shot some killer two hundred yard ten shot groups with my Stahl rifle from the bench. Always makes me wonder about all this special bench rest rifle talk.  My Hoch has similar drop in the stock yet I have no problems with it from the bench. When the wind don't blow, that is.

         Joe.

There are two main components of "accuracy" we are talking about here,   The mechanical set, rifle and all of its systems and parts, the cartridge including case.powder and the bullet itself; and the parts of the bench and rest- set up itself --- assuming you are talking about bench rest accuracy.  
Bullets are just one specific component in the whole overall accuracy composition.  A specific bullet design may be very accurate; if it is in the right case/chamber/bore with the right load/alloy/lube--assuming all the other aspects are functioning optimally. 
We often tend to think of a given bullet as "accurate" or "inaccurate" in and of itself. But that depends on so many other conditions that general consensus unless carefully quantified and qualified is not very valid. Some are popular because they are easier to develop accuracy with, in a general sense, than others.  this may or may not be valid is a different set of conditions.   Others, including the "stop ring" designs may have a lesser reputation because the conditions where they might shine are less commonly found on the modern rifle range

Then there is the various thing that make up the shooter, physically, mentally, and the talent and learned skills. this part is of major impact no matter which side of the game you are playing on,  offhand or bench

Some of us tend to focus our interest more on the hardware, some more on the shooter.   (I find it much more comfortable to blame my poor shots on the hardware than on myself  LOL)

Your personal expectations and accomplishment will depend on how all of these things work out--in the total combination.  it requires a balanced approach.

Dale,
There are only about 12 - 15 people in the US that shoot these things in competiton.

At Raton this year, there were 6 shooters of which only 5 shot in the match. The year before there were 9. At the NW ISSA regional 2 years ago there were 6 shooters of which Joe (Westener) an I were 2 of them. This past year there was only 2 that shot (I couldn't go). So, the sample of shooters to draw on is very limited and your question of what to expect was a very valid one. It's really a wide open game but, because all the matches are OH, the results are ALWAYS in favor of the good OH shooters and not the rifles or their unique individule accuracy.

Most of these fine rifles are kept in safes and never taken to matches. Please keep posting your results especially if you can get to a 200 yard range to develope a load. You have a excellent start!!!

Frank