Help with grain difference in ammunition for each caliber

Discussion in 'The Ammo Can' started by djhaycock, Jan 3, 2008.

  1. djhaycock

    djhaycock XDTalk 100 Member

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    Since I'm new to shooting, I'm trying to learn as much as possible. Recently I went shopping for ammo and walked out absolutely confused. I ended up buying some Federal Hydra for my XD 9SC, it seemed like a lot of people here use it.

    When looking at the ammo I realize there is a difference between 115 grain, 124 etc., but what is it? What does that all mean?

    Next, it seems like +P is pretty popular for home defense in 9mm as well as other calibers, what's the forums opinion of that?

    Finally, are there any good books on ammunition and the hobby in general that I should be reading? What would you consider MANDATORY reading for a newbie?

    Thanks.

     
  2. Fastsc92

    Fastsc92 XDTalk Member

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    When buying ammmo, the grain size refers to the weight of the lead or jacketed bullet. A heavier bullet will have more energy when it hits its target.

    When reloading ammo, grain refers to the weight of the powder inside of the casing. 9mm ammo can have anywhere from 4gr-8gr of powder, depending on what brand you use and how fast it burns.

    +p ammo and +p+ ammo refers to ammo that produces more power and chamber pressure. (+p+ has more power than +p).
     
  3. bkelm18

    bkelm18 XDTalk 1K Member

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    Just so you know, +p+ is not a SAAMI designation. I personally wouldn't shoot it out of my guns.
     
  4. vafish

    vafish XDTalk 1K Member

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    A "Grain" when referring to bullets or gun powder is a measure of weight.

    There are 7,000 grains in a pound.

    So a 124 grain bullet is heavier than a 115 grain bullet.

    Here is a link to a good description of +P and +P+

    http://www.frfrogspad.com/miscellk.htm# P
     
  5. 714XD

    714XD XDTalk 100 Member

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    so is there a different feel when firing between the two grain types?
    would this affect sight alignment?
     
  6. fredj338

    fredj338 XDTalk 10K Member

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    The heavier bullet does not always deliver more energy. Energy goes up w/ the increase of vel. A 124gr+p will produce more energy than a std. vel. 147gr load. The heavier bullets will offer deeper penetration for SD. Recoil wise, the +p loads in any bullet weight will recoil more than std. vel. loads. For practice ammo, std. vel. 115gr FMJ ammo is fine.
    You need to get some good instruction from a serious shooter. There are few books available & you'll have many questions. Just keep asking.:mrgreen:
     
  7. 714XD

    714XD XDTalk 100 Member

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    Do you recommend any book in particular to start off with?
     
  8. agalindo

    agalindo XDTalk 15K Member Founding Member

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  9. Loves2Shoot

    Loves2Shoot Official Site Vendor Supporting Vendor

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    Yes, if you shoot a 115 grain 9mm bullet it will not impact the same as a 147 grain bullet.
     
  10. fredj338

    fredj338 XDTalk 10K Member

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    Again, not necessarily. If you are talking 7yds, virtually no diff. depending on your pistol & shooting style. Out at 15yds you MAY see the heavier bullet impacting higher.
    Sorry 714, there are many good books on tactical shooting but I'm not aware of any good beginners books. Hands on basic instruction would be great. Try the NRA website for instructors in your area. I used to be a cert. NRA pistol instructor. If you need some pointers or want to ask questions, shoot me a pm.
     
  11. Loves2Shoot

    Loves2Shoot Official Site Vendor Supporting Vendor

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    Of course the closer you are the less you will notice it. At 10 yards my 147 Atlanta Arms ammo hit 2" to the right and about a 1" higher than my 115 grain ammo.

    At 7 yards it make a difference if you are trying to be accurate. In that I mean I should be able to hit a 1" paster at 7 yards with every round I fire.

     

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