Having problems with the Remington Copper Solid sabot slugs
I currently use. My Winchester 1300 12ga responds well to them
at the range with nice tight groups at 50 yds, but when I double
lung a deer it runs off 80yds or better. I grew up shooting buck
shot in NJ, so slugs are a new thing for me. I just have a hard
time believing a 1oz slug doesn't bring a deer down closer to
the place of impact. Any recommendations? Better slug out there?
I've tried the Winchester and Winchester Supremes, but they shoot
way to eratic at 50yds. Is the use of copper the problem?

Any guidance would be greatly appreciated.