Hunting Washington Forum

Equipment & Gear => Guns and Ammo => Topic started by: Jason on October 26, 2010, 08:12:18 PM

Title: Ruger m77 mark II trigger help
Post by: Jason on October 26, 2010, 08:12:18 PM: I had a trigger pull of 7lbs on my Ruger m77 mark II, so I did some mods to the trigger and sear, I did not cut the top of the trigger to a full 90* angle as the diagram said to and I only removed .010 from the sear face instead of the full .0150 as the diagram said to.
I was hoping for a 3.5-4lb trigger and now it fires at 24-26oz :yike:. this is a hunting gun not a bench gun, I tried the floor tap method and could not get it to fire, should I leave as it is or should I buy a aftermarket trigger?
I did the mods to the trigger knowing if it was to light or if I screwed it up some how that I would just buy an aftermarket trigger.

heres the instructions I went by
http://www.centerfirecentral.com/77trigger.html (http://www.centerfirecentral.com/77trigger.html)
images
http://www.centerfirecentral.com/images/trigger.gif (http://www.centerfirecentral.com/images/trigger.gif)
Title: Re: Ruger m77 mark II trigger help
Post by: Straight Shooter on October 27, 2010, 02:29:58 PM: If it's something that you aren't absolutely comfortable with... or, don't feel that you can trust 100%, I'd install a good aftermarket trigger. 24-26 ounces is too light for my tastes in a big game rifle... especially, when you're dealing with a cold or gloved trigger finger. My primary deer rifles are both Rugers in .308... both shoot fine with their factory-set triggers... never considered adjusting them... especially, if I had to do some cutting/trimming/filing :yike:.
Title: Re: Ruger m77 mark II trigger help
Post by: FC on October 27, 2010, 03:03:09 PM: I would try following the directions a little more closely and if not satisfied with the results I would replace the trigger with an aftermarket.

Be sure of your angles as they are critical here, keep them sharp and flat or beveled as directed, if they are sloppy the trigger function will be unpredictable, go back over everything you have done and compare closely with the illustrations and read the directions again to insure that you have a complete grasp of cause and effect when changing the angles.
Title: Re: Ruger m77 mark II trigger help
Post by: Jason on October 27, 2010, 03:51:28 PM: Quote from: FC on October 27, 2010, 03:03:09 PM
I would try following the directions a little more closely and if not satisfied with the results I would replace the trigger with an aftermarket.

Be sure of your angles as they are critical here, keep them sharp and flat or beveled as directed, if they are sloppy the trigger function will be unpredictable, go back over everything you have done and compare closely with the illustrations and read the directions again to insure that you have a complete grasp of cause and effect when changing the angles.
the directions were pretty straight forward, I used my digital calipers to measure the parts before, during, and after, only thing i did not do was remove all the material as discribed in the detailed blue print, figuered I would check the pull weight before I removed all the material, I used 3M 3 mil microfinishing film to polish all finished surfaces, I removed .010 from the sear lip to reduce the creep .005 less than the specified, I did not bring the trigger post down to a full 90 degree angle.

I am thinking about throwing the trigger on the mill and removing the spring dimple, then drilling and tapping it for an adjustable trigger screw, that way i can adjust the poundage on the spring without removing the stock.
Title: Re: Ruger m77 mark II trigger help
Post by: FC on October 27, 2010, 04:53:18 PM: If you have access to the tools I would definitely do that! Take the post all the way down too.
Title: Re: Ruger m77 mark II trigger help
Post by: Lowedog on October 27, 2010, 05:30:44 PM: What is not specified in the instructions is if you modify your trigger to his exact specs what trigger weight you will end up with. Unless I just missed it. :dunno: Where he specifies a 90deg angle what did you end up with?
Title: Re: Ruger m77 mark II trigger help
Post by: Jason on October 29, 2010, 05:47:54 AM: Quote from: Lowedog on October 27, 2010, 05:30:44 PM
What is not specified in the instructions is if you modify your trigger to his exact specs what trigger weight you will end up with. Unless I just missed it. :dunno: Where he specifies a 90deg angle what did you end up with?
The forum that I got the links from had several guys that have done this trigger job several times to the specs given and all were reporting 2.5-3lbs with the stock trigger spring, I was hoping for 3.5-4lbs thats why I did not take the top of the trigger down to the true 90 degrees.
not sure what angle im at, I know I still have around .010-.014 to remove to get 90 degrees.
Title: Re: Ruger m77 mark II trigger help
Post by: Lowedog on October 29, 2010, 06:57:04 AM: Maybe if you take the angle back the other way slightly so that it has to lift the sear more you will increase pull weight.
Title: Re: Ruger m77 mark II trigger help
Post by: mebco09 on October 29, 2010, 02:44:20 PM: Go out and buy a timney trigger. you won't regret it.