need some education on beginner comp. shooing
Going to order 1000 rounds soon, thinking 124 grn
What would you sugg.? FMJ? Hollow point? Diff. Grain?

Will be used at GSSF shoots and local club shoots
Mainly for fun, but to also up my skills for personal
Defense.

 Suggestion, ass chewing, and info needed

Try to not ramble as I am reading and typing from
Iphone, at i laws house and heavily sedated by crown

Thanks in adv.

Try a few different brands and bullet weights and see first hand what works best in YOUR gun and then buy a case of that. All guns will show functional and accuracy preferences ( this goes for the same model gun from the same company ( as in glock 17 serial number one. Shot best with brand x type y ammo while serial number two shot best with brand a type c ammo) in my experience glocks pretty much eat anything well and are more than accurate enough with all ammo for the not very demanding accuracy standard required of gssf( I am a gssf master class shooter) I end up using whatever I can get the best price on ( luckily my guns do not appear ammo sensitive but that will not always be the case)

I find comp. shooters in my neck of the woods usually try to avoid hollow points due to possible feeding issues in some guns.

I shoot a G34 for USPSA and 3 gun... 147s are considerably more accurate for me at distances out to and past 25m.... I shoot a hand load fmj at about 915fps for club matches... but for big matches I shoot Federal American Eagle 147s

Unlike lasnyder I have found 124 most accurate but let me briefly review  my testing from a few years ago. I shot my glock 19 at 25 yards and found the following using several brands of 9mm I had on hand:
Average 124 grain group was just a hair under 2&1/2 inches for ten shots
              115 average just over 2&1/2
              147 at 2&3/4
Considering on gssf the a&b plus zero zone together is like 12 inches in diameter any of the bullet weights will be more than accurate enough.
When you get really fast and accurate you may start to see some marginal advantages to a specific bullet weight or design but that will be very far down the road
Even as a gssf master I really can not tell the difference

Good discussion. I too am thinking about getting into GSSF.

I've always done fine with 115s from Walmart. If you haven't shot competition before start modestly with equipment and ammo. Modify your gear and ammo when you outgrow your stuff. I switched from a G19 to a G34 because I got to the point where the 19 was no longer letting me shoot to my full potential.

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Aje of course you are correct on the target size. I only use d1 for gssf and my bottom line point is still valid with the scoring rings so large even at 25 yards ammo selection doesn't mean much. If your gun and ammo combo will run a six inch or less group( as aje's picture shows glocks are more than capable of groups half that size) it is all up to the shooter after that.
The biggest bit of advice I can give starting gssf shooters is not to think of gssf as a speed sport but treat it more like shooting bullseye with two hands. Most new shooters try to blaze through targets way too fast without focusing on trigger control (reinforcing bad habits instead of training them out)
Ten a/b hits in 12 seconds is better than 10 c/d/m in 4 seconds.
My ten round strings on gssf matches run around 6-8 seconds on average which is not at all fast. But I usually end up at the end of the match with only a couple c/d hits with the rest a/b resulting in very little time added to my score. With these types of run times you will be well within range of the top ameteur scores

^  painfully slow, haha.