29-3 silhouette model questions

I shot the 29-3 the other day I was showing some pressure signs so I stopped. A very knowledgeable handgun guy tells me the cylinders on those guns he had a few have extra large cylinders not the throats I don't have plug gauges that size but if I had to take an educated guess by the way the fired brass fits it's in the .460 range anyone hear about this ?
Thanks
MS
 
A very knowledgeable handgun guy tells me the cylinders on those guns he had a few have extra large cylinders not the throats I don't have plug gauges that size but if I had to take an educated guess by the way the fired brass fits it's in the .460 range anyone hear about this ?
Thanks
MS

Punctuation is your friend.
 
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