New shot group

[esp]

This is without the lead sled after the advice from cmh2007

[viper3853]

looks better!

[trophy8]

That's nuts. I'm sorry if I missed all the details but what did you determine the cause was? It's a rifle problem or placement problem. I assume foreend was flexing?

[Brute Killer]

So about a hair over a half inch, is it?
Nice

[dustoffer]

IMO, the lead sled is a crutch and contributes more to poor shooting habits and groups than it helps. However, YMMV.