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What is your trigger pull weight on your Webley MK VI?

Posted: Wed Feb 28, 2018 2:51 am
by general konev
My newly acquired MK VI was not igniting the primers in about 40% of the 45 acp moon clip rounds I was firing. The firing pin was striking the primers on the periphery at the 3 o'clock position. The firing pin looks perfectly symmetrical. When I first got it, I disassembled it completely for a thorough cleaning. I had noticed that one of the little prongs at the end of the mainspring was missing about a quarter of its length, compared to the other prong.

Took it to the gunsmith because of the misfirings. He was certain that the one short prong at the mainspring tip was absolutely to blame for the off center primer strikes. So he put in a new mainspring.

Took it to the range again. Now its "only" misfiring about 5% of the rounds. Strikes are still at the 3 o'clock position on the primer, but the new replacement mainspring is SO STIFF it is just hitting them a lot harder than the original.

Problem is the trigger pull is now outrageously heavy. Single action is WAY over 8 pounds ( my gauge only goes up to 8 pounds) and double action must be 30 pounds. My gunsmith suggested sanding down the sides of the mainspring until the pull weight becomes acceptable.

What is the trigger pull weight on your MK VI?

Re: What is your trigger pull weight on your Webley MK VI?

Posted: Wed Feb 28, 2018 9:04 am
by Rapidrob
Six pounds double action, 2 1/2 pounds single action. The firing pin strike is not normal. Either the hammer is slightly bent or the cylinder is off because of pawl wear.
The full moon clips can be too thin as well. Since they hold the cases to be struck,if too far away you will get duds.
Also the firing pin tip could have been reground to prevent piercing of the primers.

Re: What is your trigger pull weight on your Webley MK VI?

Posted: Wed Feb 28, 2018 1:26 pm
by general konev
Whoa, that is light! After reading your reply I took out the replacement mainspring and ground it down considerably. These new Webley mainsprings are incredibly robust and thick compared to the old original mainsprings.

Mine is now at 3 1/2 pounds SA, and estimate 9 pounds DA (my gauge only goes up to 8 pounds, but it breaks about a centimeter beyond the 8 pound mark). When the original mainspring was in, the SA was at 8 pounds.

Rapidrob do you get light strikes with yours?

Re: What is your trigger pull weight on your Webley MK VI?

Posted: Thu Mar 01, 2018 5:14 am
by RWS
If you're still getting light strikes, try a box or two of Federal American Eagle ammo or if you reload use Federal primers. Federal's primers have the about the softest primer cup material and take less hammer energy to set off which generally will translate into greater ignition reliability.

CCI primers are at the other end, having much harder primer cup material, so avoid Blazer, Speer, and Lawman ammo.

Finally, you didn't specify but don't use the synthetic rubber Rim-Z moon clips if you're having ignition problems. Stick with the steel ones. The rubbery material absorbs hammer energy and effectively reduces transmitted energy to the primers.

One of my old Webleys has a weak mainspring that provides a great feeling DA trigger but I only get 100% ignition with Federal primers. Since I reload all my Webley ammo this is not a problem for me.

-Bob

Re: What is your trigger pull weight on your Webley MK VI?

Posted: Fri Mar 02, 2018 12:55 am
by general konev
I already use metal moon clips and reload with Winchester primers.

Turns out my ground down mainspring was hardly making a dent in the primer, though it sure felt sweet and smooth with a 3 1/2 SA pull. Couldn't ignite a single cartridge. So I threw it out and put in another new stiff mainspring only slightly lightened. SA is now about 9 pounds but ignition is certainly better.

I'll try Federal primers next order.

Re: What is your trigger pull weight on your Webley MK VI?

Posted: Fri Mar 02, 2018 7:38 am
by RWS
For what it's worth, my Webley with the weak mainspring will set off Winchester primers about 90% of the time but (so far) I'm getting 100% ignition with Federal primers.

Winchester primers are softer than CCI's, but not as soft as Federal. Since you reload, trying 100 Federal primers will be a minimal expense and a good experiment. I will be interested in seeing if your results match mine. Please post your results.

-Bob

Re: What is your trigger pull weight on your Webley MK VI?

Posted: Sat Mar 03, 2018 1:52 am
by general konev
Will do.

Re: What is your trigger pull weight on your Webley MK VI?

Posted: Sun Mar 11, 2018 11:25 pm
by S.B.
I had the same problem with my Enfield bought a new main(Numeric) spring( no frame stud) but, had to take some off booth sides to be able to pull the thing off both double and single action.

Re: What is your trigger pull weight on your Webley MK VI?

Posted: Sun Apr 15, 2018 4:50 pm
by S.B.
RWS wrote:
Fri Mar 02, 2018 7:38 am
For what it's worth, my Webley with the weak mainspring will set off Winchester primers about 90% of the time but (so far) I'm getting 100% ignition with Federal primers.

Winchester primers are softer than CCI's, but not as soft as Federal. Since you reload, trying 100 Federal primers will be a minimal expense and a good experiment. I will be interested in seeing if your results match mine. Please post your results.

-Bob
Good info, Bob, I leaned this years back(in the bullseye game) and as usual had forgotten this. Will try Federals and put the original spring back in.
Steve

Re: What is your trigger pull weight on your Webley MK VI?

Posted: Sun Mar 31, 2019 9:46 am
by S.B.
Has anyone ever or heard of someone ever trying to mate a Mk IV barrel to a Mk VI grip frame? Or is this not possible?
Steve

Re: What is your trigger pull weight on your Webley MK VI?

Posted: Mon Apr 01, 2019 9:16 am
by RWS
The problem of the existence of two totally different Webley Mk IV's raises its ugly head. Webley always used the No. 1 or No. 2 designations with the No. 1 revolver being a larger .455 framed revolver and the No. 2 revolver being a smaller .38 caliber variant.

It also makes a huge difference as to which cylinder you would use. No 1 Mk IV or No. 1 Marks V or VI?

Although I have not tried it I am almost 100% certain that a No. 2 Mk IV barrel in .38/200 caliber can NOT be mated to a .455 Mk VI frame. Too big a difference between the frame sizes.

The advent of the No. 1 Mk V in 1913 was a major revision to the Mk IV with numerous engineering changes. So... while it is possible that a No. 1 Mk IV barrel in .455 can be installed on a Mk VI frame I'm thinking it would require a cylinder from either a Mk V or Mk VI revolver to work properly. I say that because the No. 1 Mk IV cylinders are .012" smaller in diameter than those on the Mk V/VI series. So, a Mk IV cylinder might index but not lock up because the cylinder stop in the bottom of the Mk VI frame recess would probably not come up high enough to engage the cylinder. For that reason alone I think you would have to use a Mk V or VI cylinder. Personally, I think there are just too many potential issues to start down that road.

If it was me I would sell the rarer Mk IV barrel and buy a more common Mk VI specimen but I know you're a tinkerer, Steve, and would not dissuade you from trying. The juice just wouldn't be worth the squeeze for me. YMMV.

-Bob