at least you have the holes on the target

no, to be seroius, I found the copper plated lead bullets very sensitive with only ligth pitted bores and not 100% correct reloading tactic. also only trust them at 50 meter.
what was your load, vithavouri N110 powder?
what you need is a long softpoint bullet, 286 grains! if this will not grouping you better sell the rifle to me.

the bullet on my pic was made from cut down 222 rem brass(.375 base diameter), loaded one of this copper plated 8mm S bullet inside. it was the only bullet I have on hands to try the new reloading die set. in the name of sience I was making a plinking bullet for a 9,5mm MS on my wish list. see sometimes here that some of you make .366 bullets from such homemade softpoints. when thinking about 9mm parabellum brass(.389)is swaged down to .366 was believing that .375 is much more simple to reduce. a homemade die that endet in .368 because I wasnt careful enough was not pleasent to swage in the rock chucker. in the end I have to rebore it to .3705.
make another .366 die and swage in two steps is maybe the way to go.