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Mark V Ultra Lightweight Misfires

Mark V Ultra Lightweight Misfires
« on: January 01, 2019, 07:40:48 AM »
I bought a Mark V Ultra Lightweight in 6.5 Creedmoor this summer and have had 4 misfires with it this fall. I almost missed a perfect opportunity on a great buck because of it. The firing pin strikes the primers but not enough to set them off. I have been using premium ammunition and it doesn't seem to change with different ammunition. I contacted Weatherby about it November 1st  on their website but haven't heard a word from them. Has anyone else had this experience with the Gun or the Customer Service?
« Last Edit: January 01, 2019, 08:43:32 AM by CHADS »

Re: Mark V Ultra Lightweight Misfires
« Reply #1 on: January 01, 2019, 09:30:51 AM »

There's a couple of things to check. The ejector could be gunked up and stiff. To clean that without disassembly you can flush it out with Brake Kleen spray or Contact Cleaner and then place a drop of Rem Oil on it at the bolt face and use an empty case to work the oil in. Wipe off any excess oil.


If that doesn't take care of it then you need to remove the firing pin and clean it thoroughly. Do not disassemble the firing pin/spring, you don't need to. Clean it thoroughly with paint thinner then Contact Cleaner or BrakeKleen spray. Lightly coat the spring with Lithium White grease. Do not get any lubricant on the firing pin itself, it works best when dry.


There's video's on YouTube that show how to remove your Mark V firing pin.


Just looking at the fired case and the indent from the firing pin being slightly off center, I'm betting it's the ejector. I don't see the normal wear at the firing pin hole that is usually present with a bent firing pin. Weatherby ships the bolts with a lot of grease on them and if that's inside the bolt body it could be gunked up now and slowing down the firing pin. The firing pin could also not be tensioned correctly but that's something you shouldn't do yourself without the proper tools and gauges. If the strike tension is too great you could punch a hole in your primer and permanently mess up your bolt face. So, don't do it. Instead call Weatherby Consumer services.
Weatherby Rifles:
M5 USA .257
M5 USA 6.5-300
M5 USA 300
M5 German 300
M5 .308 TRR
VG .308
VG 270
Other:
Win M70 30-06
Brn XBolt HC Speed 300 WSM
McMil G30 Dynasty 270 WSM
Ber B-14 HMR 6.5 CM
Mar 1895 SBL 45-70
Win 94 pre 64 30-30
4 AR-15 Match 5.56
2 AR-15 Match Wylde .223
1 AR-10 Match .308

224KING

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Re: Mark V Ultra Lightweight Misfires
« Reply #2 on: January 01, 2019, 12:03:33 PM »
Don't email Weatherby.Call them if you want top notch service.
Sorry... Yesterday was the last and final day for any and all complaints whatsoever.

I try to avoid temptation unless I can't resist it.

Everyone has a photographic memory.Some just don't have film.

dubyam

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Re: Mark V Ultra Lightweight Misfires
« Reply #3 on: January 01, 2019, 12:28:41 PM »
A good cleaning is the first order of business. Could easily be gunk in the bolt body impeding the firing pin. Once you clean it and reassemble, then you can assess pin protrusion to see if that's an issue.

And the above advice prior to my post is good, on all counts.
I believe this is a practical world, and in it I can count only on what I can earn.  Therefore I believe in work, hard work. - The Auburn Creed
The older I get, the less stock I place in what men say, and the more I place in what men do. - Andrew Carnegie

Re: Mark V Ultra Lightweight Misfires
« Reply #4 on: January 02, 2019, 07:59:14 AM »
Thanks to all of you for the advice. One other thing I found in my searching is that some people have reported being able to fire the weapon when the bolt is not all the way locked down. if it is slightly lifted from the fully closed position it will still fire but sometimes cause a light primer strike. This seems possible due to the uncentered striking of the primer as shown in my photos above. I will have to test this the range. Thanks again everyone.

UPDATE: The gun will allow the trigger to be pulled when the bolt is far from being fully locked down (right as the lugs begin to grab it will allow the trigger to be pulled. 
« Last Edit: January 02, 2019, 08:09:16 AM by CHADS »

Re: Mark V Ultra Lightweight Misfires
« Reply #5 on: January 02, 2019, 10:28:25 AM »
Quote
The gun will allow the trigger to be pulled when the bolt is far from being fully locked down (right as the lugs begin to grab it will allow the trigger to be pulled.

All of mine do this so I do not consider it abnormal. However, this does give me some concern as to how you found this. Can you post a picture of the bolt handle when it's open and then fully locked down. I need to see the bolt handle and the rear of the bolt so I can see if there's a larger than normal gap between the bolt body and the bolt sleeve.
« Last Edit: January 02, 2019, 10:30:54 AM by HighDesertHunter »
Weatherby Rifles:
M5 USA .257
M5 USA 6.5-300
M5 USA 300
M5 German 300
M5 .308 TRR
VG .308
VG 270
Other:
Win M70 30-06
Brn XBolt HC Speed 300 WSM
McMil G30 Dynasty 270 WSM
Ber B-14 HMR 6.5 CM
Mar 1895 SBL 45-70
Win 94 pre 64 30-30
4 AR-15 Match 5.56
2 AR-15 Match Wylde .223
1 AR-10 Match .308

Re: Mark V Ultra Lightweight Misfires
« Reply #6 on: January 02, 2019, 11:20:13 AM »
Here are three images. the first is where the bolt is fully open, second fully closed, and the third is where it will allow me to pull the trigger. (figured out the limits dry firing)
I will see if I can post a short video but I don't think the file type is supported.

Re: Mark V Ultra Lightweight Misfires
« Reply #7 on: January 02, 2019, 11:46:00 AM »
O.K. thanks for the fast post back. All of what your showing in your pictures looks normal and I have tested the early trigger situation on a couple of different rifles. They all do the same thing so this it's not something unique to your rifle. If you could please remove the bolt from the rifle and take one more close up picture of the entire bolt that would be great.
« Last Edit: January 02, 2019, 11:51:37 AM by HighDesertHunter »
Weatherby Rifles:
M5 USA .257
M5 USA 6.5-300
M5 USA 300
M5 German 300
M5 .308 TRR
VG .308
VG 270
Other:
Win M70 30-06
Brn XBolt HC Speed 300 WSM
McMil G30 Dynasty 270 WSM
Ber B-14 HMR 6.5 CM
Mar 1895 SBL 45-70
Win 94 pre 64 30-30
4 AR-15 Match 5.56
2 AR-15 Match Wylde .223
1 AR-10 Match .308

Re: Mark V Ultra Lightweight Misfires
« Reply #8 on: January 02, 2019, 12:48:45 PM »
Try these. Let me know if you need another angle. Thank you for your quick responses!

Re: Mark V Ultra Lightweight Misfires
« Reply #9 on: January 02, 2019, 02:32:50 PM »
Everything looks good in the first 4 pictures. In the last picture there appears to be a raised ring around the firing pin hole. It's just the camera. I have a recently trued 6 lug bolt and I know the face on that is true. I took a picture of it and it looks raised also, I think it's a reflection off the extractor. However, I have to ask you to run your fingernail over the area to see if you can feel a raised area just so we can eliminate it.
Weatherby Rifles:
M5 USA .257
M5 USA 6.5-300
M5 USA 300
M5 German 300
M5 .308 TRR
VG .308
VG 270
Other:
Win M70 30-06
Brn XBolt HC Speed 300 WSM
McMil G30 Dynasty 270 WSM
Ber B-14 HMR 6.5 CM
Mar 1895 SBL 45-70
Win 94 pre 64 30-30
4 AR-15 Match 5.56
2 AR-15 Match Wylde .223
1 AR-10 Match .308

Re: Mark V Ultra Lightweight Misfires
« Reply #10 on: January 03, 2019, 09:38:59 AM »

Since everything looks good at the bolt, there are two possibilities. The first is a bent firing pin. It is tapered so if that's the problem it will be pretty obvious once you have it removed. The second is actually 2 possibilities. First, there may have been a problem during the reaming of the bore or there may have been a problem with the receiver or barrel threading. If you've looked at the firing pin and know it's bent then call an order a new one. If the firing pin isn't bent then call and talk to Consumer Services
(307)-675-7800. I would expect a wait since they are still getting moved last I heard.
Weatherby Rifles:
M5 USA .257
M5 USA 6.5-300
M5 USA 300
M5 German 300
M5 .308 TRR
VG .308
VG 270
Other:
Win M70 30-06
Brn XBolt HC Speed 300 WSM
McMil G30 Dynasty 270 WSM
Ber B-14 HMR 6.5 CM
Mar 1895 SBL 45-70
Win 94 pre 64 30-30
4 AR-15 Match 5.56
2 AR-15 Match Wylde .223
1 AR-10 Match .308

Re: Mark V Ultra Lightweight Misfires
« Reply #11 on: January 03, 2019, 10:42:50 AM »
The bolt face doesn's have any ridges. (It was just the image) The firing pin looks pretty much true to me. What do you think?

224KING

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Re: Mark V Ultra Lightweight Misfires
« Reply #12 on: January 03, 2019, 10:59:31 AM »
Really clean too.I was hoping to see some grease or gunk on it.Hard to say what's causing your problem
Sorry... Yesterday was the last and final day for any and all complaints whatsoever.

I try to avoid temptation unless I can't resist it.

Everyone has a photographic memory.Some just don't have film.

dubyam

  • *****
  • 4855
    • View Profile
Re: Mark V Ultra Lightweight Misfires
« Reply #13 on: January 03, 2019, 11:30:09 AM »
It could be an out of adjustment firing pin protrusion. It's not well known, but the protrusion of the pin on Mark V rifles is adjustable within a narrow range. Here's a link discussing it:

http://www.weatherby.dk/showthread.php?5045-Firing-Pin-Protrusion
I believe this is a practical world, and in it I can count only on what I can earn.  Therefore I believe in work, hard work. - The Auburn Creed
The older I get, the less stock I place in what men say, and the more I place in what men do. - Andrew Carnegie

Re: Mark V Ultra Lightweight Misfires
« Reply #14 on: January 03, 2019, 12:15:44 PM »
The bolt face doesn's have any ridges. (It was just the image) The firing pin looks pretty much true to me. What do you think?



Agree, the firing pin looks fine to me, certainly not off enough to cause the strike on the primer to be as far off as it is. My recommendation at this point is to put it back together and shoot it to see if the primer strike is in the same spot as the misfire. If it is then send it in. If it isn't and the primer strike is dead center of the primer then it may have been something as simple as the bolt lug faces not having enough paint worn off of them yet.
Weatherby Rifles:
M5 USA .257
M5 USA 6.5-300
M5 USA 300
M5 German 300
M5 .308 TRR
VG .308
VG 270
Other:
Win M70 30-06
Brn XBolt HC Speed 300 WSM
McMil G30 Dynasty 270 WSM
Ber B-14 HMR 6.5 CM
Mar 1895 SBL 45-70
Win 94 pre 64 30-30
4 AR-15 Match 5.56
2 AR-15 Match Wylde .223
1 AR-10 Match .308