Ross M-10 rear sight question/problem

The Ross M-10 rifle I just recently aquired has two stamps on it that have a crown over crossed flags and DPC. between the poles. Not sure what that stamp is, maybe indicating "Drill Purpose condemmed" which could indicate obsolete. I'm not sure. Most DP stamped rifles I've seen had just a large DP stamped on them.
Any way I checked it out and everything appeared to be ok. It has an excellent bore. I also made sure the bolt had been put together right. Took it to the range and put 20 rds through it without a problem. The cases looked ok so the chamber has not been enlarged. Shot good groups but 6" to the left at 50 yrds.
The problem is the windage sight is set too far to the right. I'm assuming the little serarated gears in the front of the leaf need to be rotated/turned to move the windage zero over but the gears will not turn or move more the a quarter turn. Am I doing something wrong? Ray

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I posted this question on some Ross forums but didn't want you guys to miss it as I have lots of faith in your knowledge.


The Ross M-10 rifle I just recently aquired has two stamps on it that have a crown over crossed flags and DPC. between the poles. Not sure what that stamp is, maybe indicating "Drill Purpose condemmed" which could indicate obsolete. I'm not sure. Most DP stamped rifles I've seen had just a large DP stamped on them.
Any way I checked it out and everything appeared to be ok. It has an excellent bore. I also made sure the bolt had been put together right. Took it to the range and put 20 rds through it without a problem. The cases looked ok so the chamber has not been enlarged. Shot good groups but 6" to the left at 50 yrds.
The problem is the windage sight is set too far to the right. I'm assuming the little serarated gears in the front of the leaf need to be rotated/turned to move the windage zero over but the gears will not turn or move more the a quarter turn. Am I doing something wrong? Ray

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Well found out the stamp is actually it is DCP meaning Dominio of Canada Proof, Ray

The sight appears twisted, your 1st pic shows a gap on the left side under the slider, the Ross sights in my collection sit flat and move freely.
Look at correcting whatever causes that. Yes the thumb wheel should rotate freely, but the worm is obviously binding on the side mentioned, nothing a bit of TLC can't remedy.

Also got the drums free but find they only lock the elevation screw from moving. Apparently has nothing with the windage movement. How does that windage get moved? Could it be that you just tap it over? Ray

Well I got the drum free but find they only lock the elevation screw from moving. Apparently has nothing with the windage movement. How does that windage get moved? Could it be that you just tap it over? Ray

Dominion of Canada Proof?

Ray, the little drum is indeed supposed to move the windage plate on the rear sight. The very fine threads on the ends of the small serrated drum, engage some corresponding threads cut into the rear of the windage plate (the flat plate that has the aperture hole, in your middle picture). I had a similar issue with my rear sight and ended up buying one from Numrich for $35, which they still list. I included a picture of my old sight with the windage plate moved over so you can see the where the drum threads are supposed to engage. Regards, Tom

Thanks that makes sense, Ray

You need to check the face plate worm contact points and correct the misalignment.

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