Thread: 6.5X55 ADI 2208 load help! Please

Ok, here i go again… First of all, thank you to you all who somehow jump in this thread and somehow help me with my question, i actually learn a bit from it.
After a few tries and failure i am here agin with maybe few more questions. I primarily need to let you all know what are the "initial" equipment and condition(if i can say anything about it), the rifle in question is a Carl Gustav in 6.5X55SE, age and rounds count is unknown to me, rifling looks good in "MY" view however i can't say anything regards the throat or any internals, crown is fine, rifle has been "sporterised" with a syntetic stock, the owner has been shooting 140r Hornady interlock as long he can remember with hand loads somehow very "dodgy" to me as every one of the 5 rounds i pull off was completely different charges, so anyway…
I did few loads as suggested here with the projectiles in case and the ADI2209 in the old brass he had kept, the results was absolute "crazy" the POI was a big guess shooting was wild, some rounds hit 5" to the side and 3" low, other 2" high and 3-4" to "some side". then i found 3 charges that sounds promising and i work some loads with different seating length, boom! the accuracy "improved" but just enough to call that "workable", my friend bought new Norma brass to take off the "brass" variable, i bought 2 different boxes of ammo(Federal Fusion and Winchester SuperX 140Gr) to try and check the accuracy with those… "tragedy", everything went down hill again, group around 3-4" and somewhere around the "bullseye" but nothing close to group "tighter" with both ammo, ammo worked out so i got in "control" of the shooting working the "shooter" variable, nah! i did shot like "crap", not that i am a good shooter but really horrible.
I did prepper the new Norma bras and reload it with the 3 most "probable" charges and bullet seating length, shot it this afternoon and the charges were quiet good with the SD at around 15 avg, however once again the groups were not great, the best was the one with SD at 7.6 and group around 4" with spread horizontal in the same line.

My question, is the throat "erosion" so significant that will cause this much trouble? would be the rifle twist not appropriate to the bullet weight or the seating should be Jammed right in? should i push the charge up(as i am not near the highest recommended by ADI)?

Well, i am sure i have more questions but i think i had enough for now or my brain "work load" will be too much.

Thank you in advance.

Mac