380-38-9mm question


poor man
December 24, 2012, 10:05 PM
i have some bullets to reload my 9mm and i have some bullets to reload my 38spl NOW the question (my micrometer battery is dead) can the bullets for the 9 be used to reload the 380? OR can the 38 bullets be used to reload the 9? im not home so i dont have any of my books or papers with me.... thanks

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Para Cassatt
December 24, 2012, 10:19 PM
Not knowing exactly what you have , I can say that some light weight 9mm bullets can be used in 380. I have loaded the Hornady 115 gr. XTP and the Speer 9mm 125 gr. swaged lead bullet both in 380. Be sure to use the proper data and make a dummy load to see if they'll fit your gun.

December 24, 2012, 10:30 PM
Yes, and No.

.380 / 9mm jacketed bullets are normally .355" dia.

.38 / .357 bullets for revolvers are normally .357" dia.

9mm bullets are normally heavier then .380 ACP bullets.

And .38/.357 revolver bullets are normally heavier then auto pistol bullets.

So, you best go home and sort out what you have, and what they all go in.
And stop by Walmart or somewhere and pick up a couple spare batteries for your measuring instrumentation.

It never hurts to have a spare!


December 25, 2012, 12:58 AM
I have to say yes & no also. I have 38 bullets that are .3555 & 9mm .3565. It really depends on the gun & how fast the powder is also.

December 25, 2012, 08:21 AM
Classic question.

► The diameter of the bullet must be sized to fit the barrel.

► The weight and shape of the bullet must be right for the firearm's action.

• 380 and 9mm bullets are generally too loose for the 38/357 barrel.

• 9mm bullets are generally too heavy to shoot in the non-locking action of a 380.

• 38 bullets usually have the wrong nose shape ("Ogive") to follow the feed ramp of an auto pistol.

December 25, 2012, 08:55 AM
For fun, I have used 9mm 125 gr .356" lead RN bullets for .38 Spl plinking loads. They worked, but the accuracy was not as good. :D

December 25, 2012, 09:04 AM
I tried some .38 Spl 125 Gr HP plated Power Bond bullets in 9MM, and they worked just fine. It was a test to see if they would work in a pinch.

I loaded them at 1.050 average OAL and used 4.9 Grs SR-4756 and got an average 1050 (Go figure) FPS in low 90's temps.

Use this load at your own risk.

poor man
December 25, 2012, 09:51 AM
THANKS yall il get batteries for the mic and wright down your info from here, when i get there il check it all out :) thanks

HAve a Merry Christmas !!

December 25, 2012, 10:45 AM
yeah, the mic takes just a regular button battery.. couple bucks at Walgreens..

December 25, 2012, 11:42 AM
I thought jacketed 38 spcl. bullets we are .357" ?

And if referring to .380 / 9mm jacketed bullets they are .355" ?

As for plated or lead don't those vary according to application barrel fit?

I'm not an expert, but if it is all jacketed then a .355", or .380 / 9mm bullet is going to be too small for the case, and, or, barrel for .357 / 38 spcl ? And then the other way around if using .357" bullets (38 spcl.) for 9mm would be .002" to large.


December 25, 2012, 01:30 PM
I use .358" 158 gr LSWC bullets in one 380.
I use .355" 115 gr JHP in all 380s.

As long as the cartridge will drop into the chamber and fall out, there do not seem to be problems.

Problems occur when the chamber is hard to close.
I have not done many experiments with 380 hard to cartridges in chamber, but I have with 9mm, and I am sure the principal is the same.
If the bullet is pinched and can't get started moving forward until the pressure is high, then that delay causes the powder to burn faster [relative to bullet position] and a pressure spike results.

But a moving bullet seems to swage down to a tighter bore without a change in pressure.
This is counter intuitive, but well documented in Ackley's 1966 book and I have verified it.

poor man
January 4, 2013, 12:59 PM
ok i got home and got battery for caliper, here is what i got ....

the back group are 9mm the others are 38

and yes i always wright on my reloading desk :) thats what solvent is for :)


January 4, 2013, 01:45 PM
9mm and .380 auto can be intechangd prviding the weight is within existing data for each. An example is a 90 gr. .355" jacketed bullet will function for either 9mm or .380.

As for 38 spcl., jacketed bullets are .357" in diameter and are not able to be reloaded in 9mm or .380.

LSWC bullets or other non jacketed bullets are a whole different story, to which I have no experience, background, or knowledge pretaining to.


January 4, 2013, 02:19 PM

In your bench photo.
Why are you measuring bullets in MM instead of .001" of an inch??

9.01, 9.08, and 9.09 are pretty meaningless to most reloaders, when American bullets measure .335" .356" .357. & .358".

There is a button on your calipers to change from metric to inch measurements.


January 4, 2013, 05:12 PM
divide by 25.4 to convert

January 4, 2013, 05:52 PM
I know how to do it.

I just should have too. :D


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