I’d guess my NULA 243 Winchester with a #1 barrel.
My NULA model 20 short in 22-250 goes 6lbs 1 ounce, wearing a Leupold vari x compact 3-9x33, and nylon sling.
My second NULA model 20 short in .223 goes 6 lbs 4 ounces, wearing a Leupold vx3 2.5-8x36, and nylon sling.
Finally my Rifles Inc Strata goes 6 lbs 8 ounces, wearing a Leupold VX3HD 3.5-10x40, and nylon sling.
These are my lightest hunting rifles.