I am looking to get a 20ga Pro Hunter barrel, was curious of what accuracy to expect and what seems to be the prefered slugs. I have an Endeavor 209/50 barrel and am not overly impresed with it's accuracy, but have noticed it improved by going back to good old black powder. my 204 ruger and 300 win mag barrels will both shoot 5 shot dime size groups. Any chance the 20 will group decent?