well i've had my .300 win mag in a ruger M77 MK II for at least a decade now and i'm not sure what took me so long the change out the trigger. i don't have to tell any of you ruger owners that the triggers are pretty poor to say the least. tons of creep, a half mile of overtravel and and heavy pull. i finally decided to invest in a new trigger rather than paying a gunsmith to fix the factory trigger and sear. i ordered a timney trigger/sear and spring kit for around $115 ish and it arrived within a week. the instructions were pretty straight forward and easy to follow. if they really wanted to make it idiot proof throwing in some illustrations wouldn't hurt. using minimial tools extraction of the old parts took about 2 minutes. the new sear dropped in easy as did the trigger and spring. the part that concerned me and might concern you if you thinking about doing this is adjusting the saftey tab on your trigger which involves filing it down. i read many reviews that people complained it was difficult. i would say if you can run a file you can do this however you MUST go slow and olny take off tiny incraments at a time. I was dissappointed that i had to file off almost 1/8 of an inch to get my saftey to work but after some slow going i works great. follow the directions explicitly if not your gun will be a danger to everyone. after reassembling i was amazed at what i had been missing. i set it around 2 lbs which may be a little on the light side for hunting i was maybe going to increase it a bit. the pull was fantastic. the overtravel scew comes factory set but of course it's adjustable. it was right on. couldn't be happier and shoots great. a marked improvement. for such a minimial investment i would recommend anyone having one of these guns to do the same. overall besides the filing i would give this product a big thumbs up.