Insufficient sear engagement.
On the 700 triggers (Pre 2000) I had, that was an adjustment (one of three, pull weight, trigger overtravel, and sear engagement). After adjusting, the test was to rap the butt onto a hard floor and it would fail of the sear disengaged.
Please don't ask me how to do it; I no longer have any Remingtons to hold in my hand and describe. Also; I'd prefer not to dive into that whole trigger safety rabbit hole.
Not specifically familiar with the Timney design, but I'd be surprised if they did not include that capacity.
Greg