First, a "chambering problem" means the cartridge will not easily enter the chamber when hand fed. It does not sound like that is what we are talking about here. Failure to feed properly can be due to several things. First and foremost, factory loaded ammo is too short in the OAL to meet the original specs. This causes the cartridge to rise in the magazine with the nose too low. This may cause it to drag in the magazine. It may cause the cartridge nose to bounce up off the ramp.
The 9 mm Luger with a four inch barrel does not need "hotter ammo", this is a problem that belongs to the 7.65 caliber. Both calibers can benifit from a handload set to the correct length.
As with any self loader the magazine can be defective.
Try different ammo and different magazines first. Get a real undertstanding of the problem before you start modifying anything. Beware of local "gunsmiths" who "think" they know how a Luger works. Try it with a handload set to the correct OAL before you modify the ramp or chamber. You might also check the recoil spring. I have opened up a number of Lugers and found a bewildering assortment of modifiied and hacked up recoil springs. (Remember the "gunsmith" who "thinks" he knows how a Luger works?)
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