Some 9mm questions


March 7, 2013, 12:54 PM
I have a lot of bullets for my .357 mag that I don't shoot that often, so I'm considering trying them in my 9mm. They are RMR 130gr FMJ and MBC 140gr Cowboy 14, BHN 12. I think I'll use 147gr data for the 140gr bullets and work back up with HS-6. 4.8gr of it works great with MBC 147s for me. What about the 130gr? Would you use 125 or 147gr data?

I'm going to try Longshot, but I only have jacketed data from Hodgdon. Does anyone have good load data for a MBC 147gr with Longshot?

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Hondo 60
March 7, 2013, 02:24 PM
At 130 grains you're only 5 over 125.
I'd use 125 data.

But you have to be careful.
The weight is only one part of the equation.

The bearing surface is another part.
You have to take into consideration how much of the bullet is touching the barrel.

And what type of material (plating, jacket or lead)
different material = different friction equation

Sometimes this hobby is enough to give me a big headache. ;)

March 7, 2013, 02:50 PM
Diameter can kill a guy.

March 7, 2013, 03:47 PM
Bullet profile is going to be what decides how you load it. Find a bullet that looks close, use lead data for lead, & start conservative.

March 8, 2013, 09:23 AM
Depending on manufacturer, most cast bullets can vary by 3-5+ gr bullet-to-bullet from listed bullet weights. ;)

March 8, 2013, 10:14 PM
Diameter may not allow rounds to chamber when loading .357/.358 dia. Bullets in chambers designed for.355 slugs. Next problem, is there sufficient (.002/.003) expansion room to allow the brass case to expand and release the slug? If not, pressures skyrocket.

March 8, 2013, 10:32 PM
Seems to me the safe thing to do if you really wanted to shoot them in a 9mm would be run them through a bullet sizer ans get them down to the correct size.

You would have to have a lot of bullets to make it worth it buying the sizing setup though

March 8, 2013, 10:43 PM
I loaded some batches across the load range with Longshot, 95gr and 115gr bullets and shot them today. I got a really good group, or ragged hole with 6.4gr and a 95gr bullet, but nothing significant from the 115s. None of the cases had any pressure signs. All were pretty dirty and even the max loads didn't throw the brass very far. My initial impression with Longshot is so-so. I'll try it next with the 147s when I can find some data and with the .40.

March 9, 2013, 01:54 AM
Before figuring out a load with those 357 bullets, you first ought to figure out if they'll fit and feed in your gun.

Also, with those 140 gr MBC bullets, I'm assuming those are cast. If you expand your cases with something akin to a Lee 9mm expander die, expect some terrible accuracy. It only flares the mouth and expands the first couple tenths an inch below that. Those tapered 9mm cases get thick quick, and modern carbide (straight wall) sizing dies push all that thick brass in, narrower than it started out. That will more than likely screw up the base of those long, deep seated cast bullets.

I have tried shooting plated 9mm bullets in a revolver. Accuracy was terrrible. I have tried loading 357 bullets into 9mm cases. None I have tried will fit in the gun, due to OAL/ogive problems.

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