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Old 04-09-2011, 09:36   #8
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Originally Posted by greenlion View Post
If .40 S&Ws can push a 135gr bullet to 1420 fps, PLUS a 165 gr @ 1240fps, plus a 180gr @ 1150fps, all the way up to a 200 gr @ 1100fps, why does anyone need the .357 sig?

The 125 grain .357 SIG is a smaller bullet and it only has 100fps higher velocity than the larger 135 gr .40S&W. If you up the weight of the .357 SIG to 147 grains, it only makes 1296fps, compared to a heavier 165gr .40S&W at 1240.

On top of that, Double Tap loads a 125 grain .40S&W load at 1445fps, lagging behind the .357 SIG round by only 5 fps.

I don't see the need to hang on to the .357 SIG round when it is already scarce on store shelves and is more difficult to reload and re-use brass, being a necked down cartridge.

Someone defend it and prove me wrong
Most newbs into shooting & ballistics miss the sectional density part of any caliber. The SD of the 135gr/40 is the same as the SD of a 105gr/357. So if both bullets have the same construction, both penetrate the same. You can drive a 105gr 357sig to 1600fps, so make both a monometal HP & the 357sig wins the penetration & tissue destruction do to the higher vel.
BTW, the 357sig can handle heavier bullets. I can drive the 135grSGDB to almost 1300fps. That is slightly better than a 165gr/40 & going about 100fps faster. It's a shame that Speer doesnt' play w/ this though, it would be a good one, but better than the 125gr @ 1350fps+, probably not. You would get more penetration out of it, but it's already got a good rep for that.
"Given adequate penetration, a larger diameter bullet will have an edge in wounding effectiveness. It will damage a blood vessel the smaller projectile barely misses. The larger permanent cavity may lead to faster blood loss. Although such an edge clearly exists, its significance cannot be quantified".

Last edited by fredj338; 04-09-2011 at 09:40..
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