Or they could have used .38 special rounds being that a .357 magnum revolver can fire .38 specials with no problem.
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Big problem--bullets are matched by comparing the rifling marks imparted by the lands and grooves of the barrel they were fired from, which are unique like fingerprints.
A .38 special bullet is the same diameter as the .357 magnum, it just has a shorter case holding less powder than a .357 magnum. That's why you can fire .38 specials from .357 magnums, but not the other way around. A .38 special is NOT "38 caliber," meaning 38/100 of an inch in diameter. It's actually .357, just like a .357 magnum.
The rifling marks would show that two slugs were fired from the same barrel, even if one came out of a .38 special case. They were both fired from the same barrel. A box of 200 grain .38 specials and a box of 200 grain .357 magnums would be loaded with identical bullets--just the cases of .357 would be a little longer, hold a little more powder, and would leave the barrel at a higher velocity. Same barrel, bullets would match.
Also, the casings (one a 38 special, one a .357 magnum, both fired from the same gun) would also have identical firing pin and breech face impressions, which are also unique. Either a bullet or a fired casing can be matched to the gun that fired them and exlcude all other guns. Not a factor in the movie, just a ballistics factoid.
Back to the movie, it's a plot hole. Maybe they though they were above suspicion, but they were leaving irrefutable evidence in every corpse that could be traced to their service weapons.
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