I have experience with one of these.
How long have you owned it, has it ever shot well and it has now deteriorated?
I had mine from new, it always use to shoot my handloads really well at .5 -.75" @100, then pretty much all of a sudden it started grouping around 3.5"
I finally discovered that it was a carbon fouling problem. After a good scrub out with a patch with autosol it was back to shooting 3 shots touching again.
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