Thanks dolo and inspect. Both your information was helpful.
I bought some 124gr FMJ from Montana Bullet. I have a few more questions:
-How do I know find out the manufacturer of the bullet ?
-For general plincking do you recommend a specific weight, i.e. 115gr. or 24gr etc?
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When I start using a new bullet, I consult my Speer loading manual first. I look for a bullet of similar construction, weight and shape and pick out a powder that I have on my shelf.
Then I scan any other loading manuals that I have such as Lyman and Sierra to look for other possibilities.
Then I look at the free downloads from the powder manufacturers. I found Hogdon, Alliant, and Accurate PDF files. These are helpful.
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Obviously, major ammo makers manufacture their own bullets. eg rem, win, fed, hornady, etc.
Smaller ammo makers often use bullet heads made by somebody else. They might tell you if you ask them.
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Common bullet manufacturers are rem, win, hornady, nosler, sierra, speer, montana gold, precision delta, etc.
Some other less well known bullet makers are Berry's, Rainier, Xtreme, Meister, Lasercast,
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For loading dimensions, look at your factory ammo. If the bullet head you bought looks similar to your factory ammo then just adjust the press until your hand loaded rounds measure the same length and crimp as the factory ammo. Calipers and eyeballs are your friends. Use both constantly.
If your reloads look like factory and measure the same, then you will have a successful first experience, assuming you got a good powder charge.
Reloading manuals give maximum dimensions, but these numbers don't always work with different bullet shapes.
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For plinking loads, it does not matter what you use. As long as it is economical and provides decent accuracy.
Here is something to consider though. If you bought a pistol with the intention of having a home defense weapon, wouldn't it be cool if you could practice and plink with ammo that looks and performs similar to your chosen self defense ammo? Refer to this thread:
https://2ahawaii.com/index.php?topic=7656.0==================
My question to you: What powder do you have?
I would not recommend using the lowest listed powder charge on your glock. Generally 9mm's like it hot. Try a charge weight between min and max.
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You will notice that Mr. Inspector has given you just about all the same advice I just did...LOL