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The rifled bore of some barrels is not always perfectly concentric to the circumference of the barrel at the muzzle. The stripper if manufactured correctly should be a snug fit over the end of the barrel.The cone in the stripper would then not be concentric with the bore of the barrel at the...

Thx for the link. I will give it a try.

I shoot 25 yd benchrest with an Anschutz 9015 so it is quite easy to index the barrel on this rifle. Has anyone tested a pcp rifle/barrel to determine whether indexing the barrel does tighten a group. My barrel is bare ( no tuner or other attachments). If so, was any improvement quantified...

Here are the two Anschutz 9015’s and the 2 Air Arms MPR’s that my wife and I use mainly for 25 yd benchrest. All 4 rifles are tuned to around 11.5 ft lbs which is about 780 ft/sec with 8.4 grain JSB Exact pellets and 735 ft/sec with the QYS Streamlined Heavy pellets.The blue stock and the walnut...