I have noticed that Ruger 77 Mk II trigger vary from about 4 pounds to 7 pounds from the factory. The Ruger trigger and sear are very simple and easy to take out, after you take the stock off and remove the bolt one pin removes the trigger and one pin removes the sear. I bought an RCBS trigger pull scale from Cabelas for about $20 and I printed the directions off of the internet and did my own trigger job. It was very easy and it didn't take very long. I lowered my 300 WSM to 3lbs and a few of my friends rifles down to 3lbs also. It is not quite as good as a gunsmith job but it cost a lot less. I put a Timney trigger on my 77 Mk II .223, it cost me $75 at Cabelas and it was easy to install but it took some time to grind down the platform for the safety swing to work, that is why it says gunsmith installation suggested. But I did it myself and it turned out very nice and it is an awesome trigger.

My Ruger 77 Mk II 300 WSM and my brothers 77 .223 will shoot a .5" group at 100 yards and my .223 will shoot a 1" group at 100 yards, a few of my friends have 77s that will shoot under 1" also.