R65, your solvent is to weak to be really effective and is designed more for a quick stop of barrel issues before they get worse because you can't get it done properly right away. Wipe Out is the best thing that has come along for firearms enthusiasts as far as cleaning goes for a long time. I can remember the days when we made up ED's Red and added liquid ammonia to it to get rid of the copper/cupro nickel fouling.
The site diopter gave you is a good place to start but IMHO that step should be the last. From the look of the stock in your pics it has been compressed and oil soaked over the decades. It needs the bedding fixed or needs to be replaced. The glass bedding material should be used on the whole area around the front receiver retaining screw. It should ideally cover all of the area on the flat portion to about 2cm in the barrel channel. The best results will be obtained if the area is filled t the top edges of the wood after the receiver has been immersed. Be very careful to follow the instructions on the bedding kit or you will have a permanently attached stock. When the bedding is hardened enough, use a paper shim, say a business card and run it along the barrel channel between the wood and the barrel. If there is anyplace it hangs up. remove the offending wood until the card slides through freely from the bedding in the receiver area to the fore end tip. Take it to the range and check your group. If it isn't tight enough for you then bed the forend tip as described in the article.
As soon as someone decides to modify a milsurp stock by cutting off pieces and opening the internal passages to the air things change and usually not for the best. I can fully understand why it's done but very shortly things change. That's where the glass bedding will come in to play. It takes things back to or puts them where they should be.
The site diopter gave you is a good place to start but IMHO that step should be the last. From the look of the stock in your pics it has been compressed and oil soaked over the decades. It needs the bedding fixed or needs to be replaced. The glass bedding material should be used on the whole area around the front receiver retaining screw. It should ideally cover all of the area on the flat portion to about 2cm in the barrel channel. The best results will be obtained if the area is filled t the top edges of the wood after the receiver has been immersed. Be very careful to follow the instructions on the bedding kit or you will have a permanently attached stock. When the bedding is hardened enough, use a paper shim, say a business card and run it along the barrel channel between the wood and the barrel. If there is anyplace it hangs up. remove the offending wood until the card slides through freely from the bedding in the receiver area to the fore end tip. Take it to the range and check your group. If it isn't tight enough for you then bed the forend tip as described in the article.
As soon as someone decides to modify a milsurp stock by cutting off pieces and opening the internal passages to the air things change and usually not for the best. I can fully understand why it's done but very shortly things change. That's where the glass bedding will come in to play. It takes things back to or puts them where they should be.