Bottle necked pistol cartridges

>>34954399
bullet go faster

>>34954399

Lighter bullets and more powder means the bullets are moving faster and have more penetrating power compared to a straight walled case

>>34954399
>Are bottle necked pistol cartridges better than tapered or straight walled rounds?
you tend to get less power behind the bullet with straight. tapered just allows the round to feed from a curved magazine.
>What are the benefits?
more concentrated force behind the projectile. so higher velocity, which means higher impact energy. problem is higher force means higher pressures. 357 sig is pretty much a 9mm bullet inside a necked 40 s&w case. this creates a higher pressure; SAAMI 40,000 psi compared to 35,000 psi; which can cause problems in the chamber and barrel.

Not OP, but somewhat relevant question: where can I find some basic principles on bullet design and why cartridges are designed the way they are?

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>>34954481
forgot the pic

>>34954497
Wait there's a difference between 9mm Luger and auto? I thought it was the same? Can a 9mm Luger gun still fire 9mm auto safely?

>>34954592
yep. the difference is literally tenths of a millimeter.

>>34954496
on bullet design, idk. but on pressures vessels u can learn practically everything about bullets. also some simple physics explain quite a lot

>>34954399
>Advantages
Improved feeding reliability, greater case capacity.
>Disadvantages
Reduced capacity in a box magazine, more difficulty in reloading.

>>34954496
In honesty most bullets are designed the way they are because of history. They usually had some parent case they didn't wanna change and worked with it. Early cartridges were straight walled because they where just containers and black powder doesn't improve much with necking.

But with modern pressure physics and aerodynamic you can get the best possible bullet depending on what you want.

>>34954742
>Improved feeding reliability

better than tapered casings?

>>34954945
the feed ramps and chamber aren't as wide, so there's less probability of failure.

>>34954945
Yes, unless the case is stupidly tapered like 8mm Lebel or something. Using .357 sig as an example, you're leading with a 9mm bullet into a just over 10mm sized hole. With .40 S&W there's you have a 10mm trying to do the same thing.

That said, this is almost purely on the theoretical level, guns are damn near 100% reliable out of the box regardless of caliber.

>>34954497
What's wrong with just using .38 Super Comp?

>>34955708
don't know much about it tbqh. other than it's higher pressure, it's a rimless cartridge. pretty sure it's longer than typical 9mm too.

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>>34954497
What in the everloving fuck is 9mm automatic?

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>>34956122
>9mm automatic
different specifications for the same round.

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>>34956155
But why, though? And how have I never heard of this?

>>34956198
it's pretty snowflake. it's literally just brass specs. 9mm luger/parabellum/nato dominates the market.
http://www.thefirearmblog.com/blog/2014/04/15/9mm-fixed-straight-walled-9mm-automatic/

>>34956425
woops wrong link
http://www.shootingtimes.com/ammo/9mm-automatic-better-9mm-cartridge/

>>34956091
>pretty sure it's longer than typical 9mm too
then why not switch to 9x21 or 9x23 for dat case capacity?

>>34954399
It's probably going to be more expensive and louder

I kinda want one of those RIA 1911s that do .22 TCM and 9mm. The .22 TCM fireball is goddamn glorious.