How to fix PU scope Sighting on Mosin Nagant?

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MaverickNH.fbmg	How to fix PU scope Sighting on Mosin Nagant?	Lead	[-]
Posts: 3 (11/26/08 08:26 AM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	Tags : None A Mosin Nagant sniper I'm fixing to buy shoots 1-2 inch groups at 100yd, but the reticle is about 1/4 right and 1/3 high. I'd like to grind/shim to center. If anyone has some advice on how to do that, I'd appreciate the help. What to grind/shim, how to do it and how much to correct- stuff like that. I have files and a Dremel, so it needs to be simple. Last Edited By: MaverickNH 11/26/08 12:28 PM. Edited 1 time.
Gabreski 1st FJ		#1	[-]
Posts: 195 (11/26/08 07:20 PM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	Im assuming you mean the reticle is in the top third of the FOV and also 1/4 of the FOV away from the right side of the scope?
Gabreski 1st FJ		#2	[-]
Posts: 196 (11/26/08 07:24 PM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	Its best to do this at the range or with a laser bore sighter. (easiest with a laser) If im not mistaken I believe your going to have to shim to bring the scope FOV to the right so that your laser or bullet impacts line up with the reticle once its centered within the FOV. Up and down isnt an issue as you can use the adjusting screws on the mount to center it.
MaverickNH.fbmg		#3	[-]
Posts: 4 (11/26/08 08:10 PM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	Yup - that's what I'm seeing. The reticle is up and right. Thanks for the advice. Where would I want to be inserting those shims?
chcusnr1	Sighting in the PU	#4	[-]
Posts: 61 (11/27/08 02:12 AM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	Good article on this at http://www.owrpc.co.uk/images/mnpu.pdf Jim
MaverickNH.fbmg		#5	[-]
Posts: 5 (11/27/08 06:28 AM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	chcusnr1 wrote: Good article on this at http://www.owrpc.co.uk/images/mnpu.pdf Jim Helpful, but I'm still not clear on where the shims go, as I can't quite tell where the grind was in the example.
chcusnr1	Shim Placement	#6	[-]
Posts: 62 (11/27/08 10:59 AM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	Look at Figure 7 on page 4. The inset shows the legs on the base. Those should show grind marks. Not sure what you would use to shim - I've never done the shimming - always been able to resolve the zero issue with grinding. See my post on restoring my Yugo sniper.
eb in oregon		#7	[-]
Posts: 380 (11/27/08 10:09 PM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	If you have to shim, it is in-between the mount base and the receiver. Use shim stock like a feeler gage. Buy a cheap set and start with about a .005 shim. Shoot and shim just the back end of the base until you find the right size. Cut off a small piece that just fits under the mount base, locktight and tighten. The basic problem using this technique is that the screw pressure must be consistant and firm. And, it is possible to ruin a screw that may already be marginal. You can try to slip your shims in-between the mount and base, but there will be a small discrepency between that and behind the base. also be careful about using a sharp tool to cut the shim stock so that you don't get any burrs on it. Good luck. Eric "We must all hang together, or most assuredly we shall all hang separately." Benjamin Franklin, July 4 1776
MaverickNH.fbmg		#8	[-]
Posts: 6 (11/28/08 05:03 PM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	So, I'd want to loosen the locking screws and then the attaching screws to slip a shim in between the base and receiver, right? I just want to be sure I'm following you correctly, being a novice Mosin Nagant owner.
eb in oregon		#9	[-]
Posts: 383 (11/28/08 08:06 PM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	Yes. This technique works for all rifles whether horizontially or vertically mounted. Just be sure to center the reticle before doing any shimming. If you've never done this, just turn the turret all the way in one direction, count the clicks (or number of turns if it doesn't click) as you turn it all the way back until it stops, then go back the previous direction one half the number of clicks (or turns) you counted. You can do the same thing with the verticle adjustment and use the two mount screws to bring in the verticle adjustment. Saves your adjustments on the turrets for when you really need them. Eric "We must all hang together, or most assuredly we shall all hang separately." Benjamin Franklin, July 4 1776 Last Edited By: eb in oregon 11/30/08 01:42 AM. Edited 2 times.
Gabreski 1st FJ		#10	[-]
Posts: 197 (11/30/08 01:15 AM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	Just to clarify a bit you would shim underneath the mount where the large screw is. There should be two pads one at the top and one at the bottom of the mount that contact the receiver. Judging by where your reticle is in relation to the bullet strikes they probably have already been ground a bit. If you dont like shimming you can always put two small beads of weld where the pads are and file these downby hand. Wont hurt or discolor if you keep it small and quick. My shim is just a piece of clear plastic I had laying around. works great. Last Edited By: Gabreski 1st FJ 11/30/08 01:27 AM. Edited 2 times.
eb in oregon		#11	[-]
Posts: 389 (11/30/08 01:39 AM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	My shim is just a piece of clear plastic I had laying around. Barbarian. "We must all hang together, or most assuredly we shall all hang separately." Benjamin Franklin, July 4 1776
Gabreski 1st FJ		#12	[-]
Posts: 200 (11/30/08 10:33 AM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	Hey well at least Im not using a screwdriver from dollar general on my guns