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Long Range Hunting's link has a good picture but it's to coarse to see what the chamber dimensions actually are. Excellent info on more recent Palma reamers.
The benchrest.com article's a good one for info.
Note the chamber neck diameters. There's lots of clearance on ammo with .3084" diameter Sierra Palma bullets and the .3445" chamber neck. Ammo neck diameters' typically been in the .337" to .338" range; .003" or more clearance around the neck of a loaded round. Chambers are not "tight necked."
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