While many 1860 Army's were converted - most with the Mason & Richards convertion - there was a transitional open-top revolver that has been mostly forgotten. It was the Colt Model 1871 or 1872, depending on the info source. It was basically a Model 1860 Army with a bored-through cylinder and a...
Go to SavageShooters.net forum and post your request there to find out how old your Savage is.
The Mossberg ATR is a fine rifle. It is a slightly modified version of the old RAPTOR rifle that came out in the early 1990's.
The ATR would probably be more in line with the Stevens Model 200...
I've heard reports that bullets with very thick jackets can cause higher pressures in polygonal rifling because they do not "reshape" to the flat-sided rifling very well. I've also heard that barrels with polygonal rifling are much more expensive to make because they have to be hammer-forged.
Something else to consider - is your boss left-handed? The reason I ask is because he could be resting his thumb on the action release lever and accidentally unlocking it during recoil.
But most likely it just has crud under the lever not allowing it to fully lock down, as the others have said.
You won't see much of a difference using either weight. My dad uses a Marlin 30-30 and which ever weight bullet Wal-Mart has on sale at the time. At 100 yards the change in impact point is only a couple of inches so you're going to be point-blank with either one. ;)
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