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Great choice!
I broke in my P99 9mm with 124gr Geco FMJ ($6.95/50). Lately I've been using Wally World Winchester 115gr FMJ (100/box @$10.xx), only because it's a roadtrip for me to get the Geco.
For economic reasons, I don't shoot too many Hydra-Shoks, but have run a box through.
I believe the general consensus is to use about 300-400 rounds of the heavier 124gr for break-in.
I still need to try out some RNL, since our indoor range allows Lead Only (weak back stop), and one more snow storm will force me indoors.
 

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Definitely stick with the 124 gr or heavier for the first 300-400 rounds. Gotta' break in that recoil spring!
 

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You can alway use what you pistol likes. I have shoot about 500 rounds of WWB from Wally World, 50 rounds of 124gr Geco and a few clips of +P ammo. My Walther will shoot just about anything.
 

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Discussion Starter · #8 ·
Okay. 124gr or heavier, thanks for the suggestions guys. Unfortunately, I couldn't pick it up today(had to take the wife to the doctor), but I WILL pick it up tomorrow. Muahahaha!
 

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When I got my 9mm P99, I didn't realize that there was any particular recommended break-in procedure; I shot all sorts of *stuff with no problem(s) whatsoever.    

*STUFF:
- Winchester "white box" value packs w/ 115 gr. FMJs
- CCI Blazers w/ 115 gr. FMJs
- My personal reloads utilizing 115 gr., 124 gr. & 147 gr. jacketed and plated bullets
- Winchester Ranger 'T-series' 127 gr. +P+ (50 rounds)

Am I sorry?  Not a bit.


 
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