Shooter's error?

I got out my .217 NSA slugs to test again. There's was almost no wind and I got a group like this. I'm curious if those smaller clusters show that there's potential and I'm not having a consistent hold, or if it's just because the slugs are the wrong size for my avenger. This is at 50 yards

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Alot of questions needing answered. I'm no Bob Lee Swagger, but are you shooting offhand, from bags, rest, bipod? Does the group tighten up at closer range? Are the velocities consistent? I every so often will get a group im proud of with a couple of my shooters, but not all. All my small bores give me barely acceptable groups (hunting) with slugs. I'm sure there's a top tier target shooter lurking that will give more insight before too long. How does it shoot with known good pellets for the avenger?
 
well, you know as much as most here and the only thing i would say is shorten the distance and test again
but i think you are sure these well not work as a pellet on pellet ammo or in this case slug

i would assume he is shooting off bags with a scope set at an unknown power, why the hold would make difference with a PCP doesn't make much sense and i assume again the rifle can shoot well with some ammo
 
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This may be a slug that just isn't going to shoot in this rifle. But before reaching that decision, I would properly clean the barrel, and check the scope and basic mechanical stuff. I have no experience with this rifle or with slugs, but I know that some pellet barrels will not shoot slugs well. When you consider the aerodynamic properties of each, it is not surprising that different barrel profiles may be needed.
 
The slugs may need to be tuned at a different speed or they are just the wrong size, that is only if your pellet groups are better. I will check various speeds with slugs that will not shoot right out of the gate. I have received a few great pcps that the original owner said would not shoot slugs. I have also run into a few Choked barrels that just will not shoot any slugs.