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Do not attempt this. Have it done by a gunmsith.
None
It is very easy to adjust the trigger on a Model 700 Remington. Remove the rifle from the stock and there is 3 small screws you can adjust. One is for the lbs. of trigger pull, which be careful you don't make it so easy it's a hair trigger and could go off just by the jar from closing the bolt. The other is to adjust the length of trigger pull.
DO NOT ATTEMPT TO ADJUST THE TRIGGER PULL!!!!!!!!!!!!!!!!! Danger, Danger, Danger. It is no older than when the 300 WSM was introduced (2001)
No. You can buy replacement triggers that have a lighter pull. They are only about ten dollars.
You take it to a gunsmith
The only way is to replace the whole trigger but it will still have a hair trigger
It is not adjustable.
Best left to a trained gunsmith
If you have a newer Winchester with a rebounding hammer, a great way to improve your gun is to replace the entire trigger group from an older rifle's trigger group with the traditional half-cock safety. The older trigger groups will fit between any model 94 rifle. I have done it numerous times, the only slight modification you may have to make is when you take a trigger group from an older rifle where it has the guide rail, you can carefully grind off the guide rail from the trigger group and then it will fit fine. The grinded off guide rail will not show once the new trigger group is installed. As for just trying to adjust your trigger, this is very tough to do without screwing the entire thing up. The older trigger group from older rifles is a much better system and has a much better pull.
Depends on the model
It depends on which marker you have and which trigger is on it. Typically the manual will tell you how to adjust it