FX New Dynamic Accuracy

[renoone]

I recently purchased a Dynamic 700mm in .22 from a reputable reseller. They checked it and put a tune on it for the slugs I would be using (H&N 34gr. That is what their sponsored shooters are shooting so they set it up for that). Out of the box it wasn't bad (3/4" at 50 yds) but I wanted it a little better so I played with some changes. Pretty minor from the out of box tune. Just wasn't great at 100 yds (around 2"). As I continued to use it with basically the out of box tune the accuracy continued to get worse the more I shot it. I checked everything like the scope, loose bolts, other things the dealer said to check, etc. All good. Now the accuracy at 50 yds is about 5". (Around 500 rounds through it) Yikes! Pressure holds well from shot to shot. I have a Labradar and it was running about 5 for ES. I cleaned it as well to see, nope. I have been in contact with the dealer and they have been good but now I am at a point of needing to send it back to them. Before I did, I thought I would see what you guys think.
Thanks...

 

[darknes]

the first thing is that the fx in the heavy liner has chocke try to shoot slugs .217. the second thing for heavier slugs you also need a heavier hammer 13.2 grams original has 12.1 grams used up to 150 Bar

 

[Squirrelmageddon]

With the groupings opening up the more it is shot, I would check for lead clippings at the transfer port and debris in the barrel. I had this issue a few weeks back using the Impact Slug Power Kit's pin probe. It was feeding slugs cockeyed and shaving lead off of the ammunition at the sharp edges of the xfer ports. I had a pile of powder down my barrel and my moderators filled up with all the debris.

My POI would shift constantly and group sizes were opening up. 3/4" groups at 26 yards was making my blood pressure spike like mad.

 

[Airgunmann]

I found with the dynamic if I get lazy and don't make sure my cheek weld is the same every time I'm all over the place with the round bottle

 

[humbled.ag]

This group was my third outing with a 600mm .25 dynamic shooting 34gFX at 950fps. 10 shot group with a little wind reading. Cherry picked of course but shows the potential. Aside from turning some things the only work done was cleaning the barrel. Which, was very dirty. It's been cleaned a few times since and the first patch is very leaded. It will get prepped properly in the cold, dark months.

 

[HogKiller]

Because I know diddly about the setup of the rifle, this sounds like something in the barrel is loose, had that happen to me on one of my Mavericks. Of course the FX site doesn't have the blow up of the gun. It sucks to have to assemble something that should have been done right the first time.