9mm Largo load????

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abunaitoo
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9mm Largo load????

Post by abunaitoo »

Looking for a load for the 9mm Largo.
Same as the 9mm Bergmann–Bayard, 9mm Bayard Long.
Cast bullet load.
Using it for the Spanish Destroyer rifle.
I've tried some loads, and different bullets, with not much luck.
Loads I've found on the web didn't work out all that great.
Bore slugs at .357, so I'm using .358 cast.
I did try some .356 115gr jacket, but it just didn't shoot well.

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RWS
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Re: 9mm Largo load????

Post by RWS »

A maximum standard pressure 9mm Parabellum load provides a very good 9mm Largo load. The Largo pressures will be slightly lower than the 9mm Para loads because of the increased Largo case capacity.

That said, I use a load comprised of 5.0 grains of WW231 behind a 115 grain FMJ bullet in my Astra 400 & Star Mod. A pistols, and it works fine. Should be a complete no-brainer in a Destroyer carbine. What I don't know is whether or not your Destroyer will prefer 124 or 115 grain bullets.

The groove diameter should have been .355" when your Destroyer was new. If you're having to use .358" cast bullets then I would suggest using cast 130 grain .38 Super bullets and 4.8 grains of WW231. If you're trying to get the job done with 158 grain cast RN bullets then start with 4.0 grains of WW231. All these should be safe in the Destroyer, but the 158 grain bullets may be too heavy to shoot to point of aim. Also, the OAL may bee too long to fit in the magazine. Lots of variables here.

-Bob

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Re: 9mm Largo load????

Post by ammolab »

What level of accuracy are you trying to achieve? “didn’t shoot well” may be as good as a Destroyer can do... MOA? Not happening.

No experience with cast but my carbine shoots 3” @ 100 yards with Montana Gold 121gr TC international match bullet over 7.9gr of Blue Dot. The long bore diameter/bearing surface of Truncated Cone or HP 9mm bullets seems to enhance accuracy in milsurp 9 mm firearms with less than precise bore dimensions.

abunaitoo
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Re: 9mm Largo load????

Post by abunaitoo »

I'm getting 3" to 4" at 50yds.
Not what I would call "good"
Bore is clean and smooth.
Shells I'm using are 9mm Max sized to the chamber.
9mm Largo shells were a little short.
I did try some Lee TC cast, 127gr.
I'm waiting for a 115gr mold to come in.

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Rapidrob
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Re: 9mm Largo load????

Post by Rapidrob »

The 124 grain bullets should shoot better than the 115 grain bullets. Velocity is key in the carbine, a bullet too fast will not stabilize properly. The rifling twist is just too slow.
I only shoot .358 bullets out of my Destroyer as does another of my clubs member. I keep my bullets right around 1,000 FPS and get very respectable accuracy at 200 meters.
Make sure the muzzle has no nicks in it. If so re-crown the muzzle.
My carbine is a very early model using the double stack magazine. The bore is bright and shiny with the wood in very good shape. It did take 35 years to find a magazine, in Spain no less!
Tin Can Sailor
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ammolab
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Re: 9mm Largo load????

Post by ammolab »

abunaitoo wrote:
Wed Oct 23, 2019 1:51 am
I'm getting 3" to 4" at 50yds.
Not what I would call "good"
Bore is clean and smooth.
Shells I'm using are 9mm Max sized to the chamber.
9mm Largo shells were a little short.
I did try some Lee TC cast, 127gr.
I'm waiting for a 115gr mold to come in.
Why would Largo brass be ‘short’? Short enough to cause what issue? How could you tell?

What is “9mm Max”?

abunaitoo
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Re: 9mm Largo load????

Post by abunaitoo »

Sometimes the extractor would not grab the rim.
It was that short.
With the longer shells, never had a problem.

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Re: 9mm Largo load????

Post by ammolab »

abunaitoo wrote:
Thu Oct 24, 2019 9:20 pm
Sometimes the extractor would not grab the rim.
It was that short.
With the longer shells, never had a problem.
What is 9mm “max”...and how “longer” is it?

abunaitoo
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Re: 9mm Largo load????

Post by abunaitoo »

Sorry......
9mm Magnum.
It's much longer, which is good, to size to length for correct head space.
I started with Starline 9mm Largo brass.
I did try some 9mm Berry plated bullets once.
Just didn't work. Over 10" at 50yds.

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