I got a new to me S&W 629 classic a couple months ago. I noticed one chamber was tighter than the other 5 so I brought it to my local gunsmith to have him slug the barrel and open up/even up the throats. To my surprise he called me and told me my barrel actually slugs at .428". Currently he is opening up/evening out my throats to 0.4295" so I can size .001 over bore. But it is odd to me as most jackets bullets are .429". I plan to mainly feed it cast but is this anything to be worried about if I do shoot jacketed at some point?
Thanks!
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