Serendipity: Means I just read an article about turkey guns. The turkey choke is a good bit tighter than the standard full choke. Nominal bore diameter on a 12-gauge is 0.729"; most turkey chokes are around 0.660".
If you use your modified choke with slugs, I doubt if anything bad will happen, but the bit of deformation might--I say might--hurt the accuracy. I don't know.
Since you already have the gun, go buy an IC for it, for upland bird-hunting; and a cylinder-bore choke so you won't have any worries about using slugs.
FWIW, Art
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