You don’t need a bigger gun, you just need to keep practicing at a mile. The further you go, the more critical your wind reading skills become.
My .243AI/105AM has outshot a .338LapuaAI/300Scenar at a mile, due to shootability, familiarity with the load and DOPE, and the ability to easily spot shots through the scope due to much less concussive blast at the shot.
Your 1 mile range must be quite a bit different than my 1 mile range......
At 1000 yards my most accurate guns are a 6-284 with 107SMK's and a 6BR AI shooting 95gr VLD's........ at 1 mile at my range I have never spotted a miss with a 6mm bullet and I always have a spotter with an alpha spotting scope.
I have a 338LapuaAI shooting 300gr SMK's, I can always spot my own shot through my rifle scope. My 338 out shoots my 6's 10 times out of 10 at a mile
