I agree type casting for Bob Lee Swagger was waaay off ,but he (Wahlberg) did a pretty good job in the role he just didn't fit the mold from the book too well. I've read all the Hunter books about Bob Lee and his dad and there are not many technical mistakes on fire arms.
Now on paper patching, It's primarily for lead rifle bullets but the theory is compatable to jacketed. Paper patching is the poor mans Sabot, Sabots leave you a projectile untouched/damaged by rifling so it is airodynamically perfect. In lead the paper also protects the base from melting and becoming unstable, negates the need for lubing, prevents leading of barrel, and detaches just like Sabot as soon as leaving barrel by air pressure and centrifical force. Paper patching has gone out of style because its a lot of work with specialized molds, not because it's; inaccurate, hard on bores, or is only for hollywood. The only thing I've ever heard or read that it wasn't real good with was the old Pope gain-pitch barrels as they tended to rip off paper in bore as the bullet spin accelerated in bore.
I have actually fired recover 5.56 mm bullets from range berm to show they could be accurate and they were. When recovered after second firing you could not feel and could barely see the origanal engraved marks from rifling. Not paper patched just reloaded