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I don't think Browning can modify trigger pull on their rifles due to liability, but you can contact a retired Browning Gunsmith who does excellent work on pull.
The trigger pull should only be adjusted by a trained gunsmith. Browning does not publish trigger pull weights.
Pull it apart, but do not pull too hard.
You take it to a gunsmith
Yes.
Computer controlled If you have a 3.0 you can turn the distributor to adjust, after you pull out the adjustment chip.
To adjust the kickdown cable, you'll need to pull up on the release and open the throttle all the way. After that, pull the outer cable housing tight and adjust the clamp. When you are finished, the outer housing should have no slack.
You will have to take it to a gunsmith to be measured. All are different.
It is not adjustable.
Best left to a trained gunsmith
Recommend seeing a gunsmith
Go to Browning.com and request a manual.