hello. i have this*http://www.kimberamerica.com/rifles/...anced-tactical.kimber advanced tactical. 308 with 24 in tapered heavy barrel. i got it from a buddy who has a whole lot more expertise in bench/long range shooting then i. he was shooting it out to 800 yards. my question is this how much range can i expect to lose if i cut the barrel? 97% of my shots will be inside of 250 yards. should i still expect to be able to shoot a deer at 400+ yards if needed with factory ammo and a 18 barrel? 20? i live in tx and have suppressors so a 32 in overall length is a bit much. id like to cut it down to around 20 inches. i know there are lots of variables but whats the happy medium on barrel length? Thanks.