Your post is a little hard to understand, but I believe your referring to watching the impact on a varmint...not seeing bullet holes on a target at 100 yds...with macular degeneration I can't see if I'm shooting a good group or missing the target with 20X and 308 dia bullets....that would depend on your eyesight...a big variable.
But if ya want to see varmints fly, the 17 Remington is good, I had two during the height of my varmint days many years ago...as you go up 40 gr Nosler BT & VMAX were pretty good in 222 or 223...above that the higher the scope power at close range is a negative, because of loss of field of view. In those days I never used a muzzle break but would have one today, especially as the scope powder increases. I used a 4.5 to 20 X on the 220 Swift but all the rest were 3-9X shooting varmints out to 500 yds. But my eyesight was good and at 9 X I could shoot the eye out or very close to it, of 29 rock chucks at 100 yds with a heavy varmint 222 bolt gun in the sitting position, in one infested farmers field, as the chuck would peek out to see if you were still there. In the end I went with a 308 27" super match 155 gr Lapua, Varget powder and Mark 4 m3 3-10X for all my Varmint shooting 1 day a grey digger squirrel at 27 yds the next at 1003 1 shot each a 308 mill dot 10 X lazer measured all shots. It was a lucky shot first hit but if you shoot one gun, one caliber, one bullet, one powder that gives low standard deviations. With good practice habits, and positive mindset You will tend to be more lucky than most. Extending the range helps with seeing bullet impact, with a 308 155 gr bullet and 10X scope you will see bullet impact at 1000 yds easy, with no muzzle break as you learn to get back on it, as bullet flight time increases to 1.4 sec and 2.4 sec for 1400 yds. Use white painted pop cans and 8 to 10 inch circles at 1000 to 1400 yds. Spend all your free time reloading and shooting...read the wind. I used the educated guess and a lazer rangefinder discarded 2 wind meters as useless and call it a 2 mil wind not MPH as I'm shooting in mils. After 10 or 15 thousand rounds down range of you favorite capable caliber and a few barrel changes, you'll get a feel for it, trained your mind as auto input shooting machine, targets or varmints...and different people do it differently. You will get lucky more often shots you can never repeat in many cases....like a white flower a 1000 yds first shot or 840 yds on a landing a logger threw out a white yogurt lid laying flat 1/4" thick dead center. A squirrel sees ya coming at 100 yds jumps off a rock and runs for it, he is safe if he can get 8 yds ..the cartridges are in your pocket the rifle is unloaded, because you just left the truck. A fast reach in the pocket grab the match round, close the bolt, throw up the rifle ,see the squirrel in the scope running for it's life, pull the 2 0z trigger...squirrel dead a foot or two from safety at 100 yds... or hit a pop can first shot at 1400 yds only a range finder...it was a lucky wind guess and a lucky shot. But they happen to those who put the time in, even if ya can't do it again...but ya have to do it twice or it's still just luck...but the constant luck has some skill involved. And it's your game, your money, your life, your standards, and now my age that determines what's good, or successful. It should be fun and challenging...but sometimes it becomes tiresome and ya jump into another shooting endeavor.