Results from Slugging my .22 Cal. LW Poly NC

[SpiralGroove]

I slugged one of my LW Poly non-choked barrels in .22 caliber using two slightly flattened .217 ZAN slugs.

The Results using a micrometer were:
1) .2214" in largest measured dia.
2) .2210" in largest measured dia.

I think this means my slugs need to measure somewhere in the range of .2210" to be really accurate.

How do this if the largest slugs readily available are .219" ??

 

[SpiralGroove]

Another member suggested using AVS Slugs for my gun given the above results .
Now, I may need to get a Tungsten Steel pellet probe for my RAW to handle the increased force in loading the slugs?