Originally Posted by Daryl in Az
Many newbs also try to use velocity and energy figures alone to decide the effectiveness of a given cartridge.
They forget things like bullet mass (weight) gained in larger bores, and therefore ignore the added momentum and penetration of heavier bullets. They compare the same light weight bullets for both calibers, and fail to recognize the full potential of the larger bore.
If you take a .308 case and neck it down to say, .243 caliber, do you end up with a superior cartridge for big game? The answer is "no". You simply end up with something different, suitable for different needs.
Same concept applies.
Not really Daryl. Bore dia matters, especially when you are talking small bore vs medium vs large. SD also matters, so does bullet mass, so does bullet counstruction. What I was trying to point out the the OP was his lack of understanding that vel & mass alone don't make up for lack of SD or bullet construction. If you are trying to get anyone to believe the 1mm larger bullet makes up for the lower SD, then you would be wrong, it's been proven many, many times over.
The Secret Service Agents said that their agency testing showed the .357 SIG to have more muzzle energy, shoot flatter while providing greater accuracy, offer more more reliable feeding due to the rounds necked-down design and provide better penetration in objects like automobile windshields.
All subjective really. More energy; less than 50ft# means little to nothing, better accuracy, most shooters, even top LEO can't ring the best accuracy out of a service round. Flat shooting; every service caliber shoots the same to 50yds +/-1", since most shooters can't take advantage of that either, also means nothing. Reliability; again, maybe. The 357sig propensity for bullet setback could be more problematic than a straight wall case when rechambering rounds.
No, the 357sig was designed around the vaunted 125gr 357mag load. It's only real reason for existing. Run the 40 w/ 155gr bullets @ 1250fps & you have a pretty close facsimily of the 357/125gr load. I would be happy w/ either, but I do like the slightly less torque/recoil of the 357sig in sim pistols.