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Hal
01-13-2008, 01:20 AM
I have a Weatherby Mark V action that's in need of a new barrel.

What all needs be done to improve this action?? (This .257 Weatherby will be a deer rifle and long range coyote gun.)

I plan to check the threads for square and true up the front of the action & bolt face.

I'm not sure on how to clean up the face of the 9 locking lugs or if I should just lap them in.

Has anyone blueprinted one of these actions?

I'll probably order a reamer with a short throat for the 87-100 grain bullets.

Thanks

Hal

John Kielly
01-13-2008, 03:03 AM
Hal,

What would you hope to achieve by blueprinting the action?

I haven't hunted for a few years now, but I was more than pleased if I could put down a three shot group under an inch at 100 yards starting with a cold fouled barrel, or the same or maybe a tad better for five deliberate shots from a hot barrel.

I would expect that if my loads weren't doing that, I'd need either to work on them a bit more or maybe have my bedding looked at. In any case that wasn't necessary as my small ring Mauser Husqvarna .243 & my push feed Winchester M70 .270 shot fine.

I had a couple of Musgrave Palma rifles that I had the front of the action trued up before I first had them barrelled, but they were carrying heavier & longer tubes than my sporting rifles. That might be worth the outlay if your gunsmith has a jig already.

Rflshootr
01-13-2008, 05:22 AM
I'd do just that. Lap the lugs and true up the reciever face. It never hurts to do a little truing. Anything that you can improve will help you in the long run. You can check the squareness of the threads and unless they are way out, I'd leave them alone.

Dave Tooley
01-13-2008, 08:59 AM
Hal

Make a snug fitting mandrel and square the receiver face between centers. Do a light lapping job on the lugs. Then check the bolt face. When you thread the barrel keep the thread fit on the loose side. Everything will square up when you tighten the barrel.

Dave

Gunner223
01-13-2008, 09:01 PM
Hal, Can't see taking the time to lap the lugs. I suspect your MK V action has one locking lug and 8 safety lugs now and will shoot about as good as it is ever going to.

Don

Hal
01-13-2008, 10:01 PM
Thanks Dave and Rflshooter for your answers.

John Kelly ...try a search on Blueprinting and maybe it will enlighten you.

Gunner223 ...is that how you build you rifles and the results you end up with???

Hal

John Kielly
01-13-2008, 11:44 PM
Hal,

I know what blueprinting is & its value.

What I missed was that you were going to do it yourself. I was considering the diminishing return on paying to get it done .

PPP MMM
01-14-2008, 12:03 AM
with depth micrometer from the face of the receiver to the face of the locked in place bolt at four different places. It may save yourself of unnecessary work as mine .460WM checked in at 0.015mm or 0.00059" and to me that's good enough for any pet rifle. If you decide to lap take extra care how do you apply the paste evenly to all of the lugs everytime othervise you'll never get it lapped the way you want it. I personally wouldn't do to Mark V anything if it checked in 0.025mm or 0.001". Just my 2c.

Shoot well
Peter

Hal
01-14-2008, 02:42 AM
John K

I'll do this job myself for my son in law, so I won't get paid anything. The only thing I'll gain is goodwill, experience and the knowledge that I get from reading this board.

PPP MMM

Thanks for the tip I'll be sure to check it out.

Hal

Gunner223
01-14-2008, 12:48 PM
Hal, Did not mean to push your button about your MK V action. I have had several apart for rebarrel jobs and as I remember, have rarely seen more than one shinny lug. Most of us have enough trouble with just 2 lugs unless you have a snug fitting bolt. Once the trigger sear pushes the rear of the bolt up, your lapping job becomes fruitless.

Don

PPP MMM
01-15-2008, 06:01 PM
Gunner 223 has a point, but that applies to any action. With the Mark V there are few things that one needs to be careful. The 1st thing to start with is to prepare the bolt. Step 1 wash all the grease and slide 2 tight rubber "0" rings one all the way to the handle and the second ring just before the grooves. Step 2 mix small amount of Armagrout , Devcon etc. and apply thin layer between the two "0" rings and cure it for 24 hours. Use slightly less of the hardenner to make the final product to be bit softer so it won't chip. Cut around the "0" rings with an artists knife and get rid of them. Dial the bolt on both ends to zero in the lathe and carefully turn down the build up putty to fit the receiver 0.001" below is just fine. Use fine 1000 grit sand paper on both ends of the build up putty and angle these to bolt body in a long angle. Be aware of the handle, don't loose your fingers!! You can do the front of the bolt the same way if you'r really fussy, but it may interfere with the grinding paste. Make a T handle and screw it into the bolt and tighten it up to the shoulders so it won't come loose. Strip the receiver of everything and clamp it so it w'll be vertical and start lapping. Pull by the handle as you lap and push on the handle after few stokes to refresh the paste. After 10-15 strokes open the bolt and lift it so you can rotate it and wash the bolt lugs and the whole inside recess area with a good squirt of WD-40 by using the tube. Reapply fresh paste evenly and repeat. You don't need to pull the fat bolt totally from the receiver. If you'r careful the Devcon or whatever you may use will last long enough to do the job right. It w'll center the bolt and itsn't that hard to get rid of it later. For the final finnish do few extra strokes. Use 600 grit paste and it may take longer to lap but you w'll never look back. Follow my instructions and you won't be disappointed

Shoot well
Peter

KenG
01-15-2008, 07:33 PM
so you are in sense sleeving the bolt. what kind of accuracy improvements have you seen with this?

PPP MMM
01-15-2008, 09:54 PM
This whole exercise is just for the purpose of not to wobble the bolt while lapping it. The "0" rings are used just as a guide to make the ends neat before machining. One has to remove the build up putty after the job's done. If one really wants to make sure the bolt of Mark V is in the same place all the time I would recomend to drill and tap the receiver from the top just before the bolt handle and use some kind of phosphoros bronze for the grab screw udjusted as needed and loctited in the right place. There may be some other material that may be far more suited to do the right job. To make the screw udjustment to last one should flattened the whole bolt length area that is underneath the screw when the bolt is drawn open so the bolt won't come to the contact with the screw until it's handle is turned down to be locked. One may have to drill a hole through the mounts to access the screw if needed. My .460WM receiver checks in 43 HRC so one should be able to drill and tap without any great difficulties.

Shoot well
Peter

PPP MMM
01-16-2008, 01:25 AM
This whole exercise is just for the purpose of not to wobble the bolt while lapping it. The "0" rings are used just as a guide to make the ends neat before machining. One has to remove the build up putty after the job's done. If one really wants to make sure the bolt of Mark V is in the same place all the time I would recomend to drill and tap the receiver from the top just before the bolt handle and use some kind of phosphoros bronze for the grab screw udjusted as needed and loctited in the right place. There may be some other material that may be far more suited to do the right job. To make the screw udjustment to last one should flattened the whole bolt length area that is underneath the screw when the bolt is drawn open so the bolt won't come to the contact with the screw until it's handle is turned down to be locked. One may have to drill a hole through the mounts to access the screw if needed. My .460WM receiver checks in 43 HRC so one should be able to drill and tap without any great difficulties.

Shoot well
Peter

,,,,,,,,,,,, After you lap clean the build up putty fromt he bolt and to udjust the screw correctly use indicator and divide the bolt wobble space (up and down) in half and your bolt will be perfectly centered once it's locked.

Shoot well
Peter

Pat B.
01-16-2008, 09:40 AM
D. Tooley, as usual you get right to the point.. Good advice IMO..

Pat B.

Dave Tooley
01-16-2008, 09:52 AM
Pat

Thanks

Dave

Hal
01-16-2008, 01:10 PM
Gunner223 no problem.

PPP MMM

Thanks for explaining how to lap the lugs on one of these beast. I know that the Mark V isn't the the easiest to work on but it's what my son in law has and wants to use so we'll work with what we have.

Hal

PPP MMM
01-16-2008, 01:37 PM
Gunner223 no problem.

PPP MMM

Thanks for explaining how to lap the lugs on one of these beast. I know that the Mark V isn't the the easiest to work on but it's what my son in law has and wants to use so we'll work with what we have.

Hal,,,,,,,,,,,,,,,,,

before you cut once, as the old saying goes. With the Mark V measure three times.

Shoot well
Peter