That's exactly how it works. Everything I do getting that small .250 moa group or less at 100 yards plays into success at work. Don't get me wrong,l hate working up a load,but it's great when I manage it.
If I'm faced with a front on shot at 300 yards on a fox,or a head shot,l know my rifle and bullet combination is up to the job. It's no good saying I'll leave it for another day,because,in the mean time it could of got into a release pen,or be working the partridge grounds. No good using a 1.5 moa rifle on shots like that,you'll be getting around a 5 inch group at 300 yards,and end up missing,or worse,wounding. I practice in field conditions at ranges further than I shoot live quarry,so when I'm facing a difficult shot,I know I have a more than fair chance of killing it. I leave nothing to chance before I pull that trigger. If you chest shoot a big target like a deer at short ranges,then carry on,I have no problem with that. But there is a place for a really accurate rifle when your job depends on results.