I was asked to take care of my mom's squirrel and chipmunk infestation, they have gotten into to many places,she lives in the country zoned for firearms but neighbors along the river are a 100 yrds each way,both neighbors want them gone.but to keep noise down I'm and travell I'm going to use cci quite. It has been years since I used them. 2 ? What should I zero the scope at and can I use a semi.i remember a bunch of years back I couldn't cycle something through a semi,whether it was ceebees or something like that.what I have now are the 710 ft per sec cci quite and using a marlin 795 or 10/22 as well as having bolt guns.not sure why I need a semi any way for squirrels.