P38 ac43- heavier bullet => slower muzzle velocity, lower pressures? - WaltherForums
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Old 01-03-2017, 02:57 PM   #1
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P38 ac43- heavier bullet => slower muzzle velocity, lower pressures?

Have recently been able to obtain 9mm LUGER 150 gr. subsonic ammo for the P38 ac43. FMJRN

I know that WWB 115 gr American Eagle 9mm LUGER 124 gr. are recommended... but both these alternatives are hard to find here.

Details of that gun are in an earlier thread:
New member from Netherlands, First P38, Your opinions? - P 38 & PP-PPK Collector Forum

Any opinions? I am sure that ammo for the P38 has been discussed a lot- I have searched for other threads, but find no reference to a bullet this heavy.

In general, my understanding is that a heavier bullet = slower muzzle velocity. Does a heavier bullet also mean less blowback force and pressure on the chamber and slide?

I would like to shoot this gun, but would really like some reassurance first.
Thanks
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Old 01-04-2017, 12:30 AM   #2
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A sub-sonic load is probably safe to shoot. In addition to bullet weight you should need to know the powder being used and the charge weight. If you pulled a bullet from a 115 gr load and replaced it with 150 gr the increase in pressure would be unacceptable.
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Old 01-05-2017, 01:56 AM   #3
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Ahh Thank you! The ammo box is labeled "9mm LUGER" which tells me is was made for the 9 mm P08 LUGER pistol. Since the P38 was the replacement for the P08, and since these two firearms were designed for the same ammo... I went ahead and bought a few boxes. I was just concerned with the heavy weight.... thanks a lot!
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Old 01-05-2017, 05:48 AM   #4
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Well, let us know how they performed.
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Old 01-05-2017, 01:00 PM   #5
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Quote:
Originally Posted by RShaw View Post
Ahh Thank you! The ammo box is labeled "9mm LUGER" which tells me is was made for the 9 mm P08 LUGER pistol.
The caliber designation "9mm Luger" does not mean these 150 grain rounds were intended to be fired or would be safe to fire in a P-08 Luger pistol. The Luger was simply the original pistol to use the 9mm Parabellum cartridge. Just like .45 ACP means .45 Automatic Colt Pistol. I don't fire anything heavier than 124 grain target loads in my P38/P1 pistols.
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Last edited by Milspec; 01-05-2017 at 05:43 PM. Reason: Clarification
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Old 01-05-2017, 05:31 PM   #6
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