.308 long range bullets

This is a discussion on .308 long range bullets within the Cartridges & Calibers forums, part of the Sniping Related category; I was doing some calculations on the JBM Ballistic Calculator page for various bullets/loads. The US military uses the Sierra Match King 175 gr HPBT ...

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  1. #1
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    .308 long range bullets

    I was doing some calculations on the JBM Ballistic Calculator page for various bullets/loads. The US military uses the Sierra Match King 175 gr HPBT bullets for snipers, and Palma shooters use the Lapua 155 gr Scenar.

    According to the calculator, with a 200 yard zero, the 175 SMK @ 2750 fps (which is faster than the military round from what I've found) has 346.1" of drop @ 1000 yds, 95.8" of windage @ 1000 (10mph full value), and puts 612.8 ft/lbs of energy on target @ 1000.

    The 155 Lapua @ 2920 fps has 294.8" of drop @ 1000 yds, 84.2" of windage @ 1000 (10mph full value), and puts 658.6 ft/lbs of energy on target @ 1000.

    To match the drop of the Lapua, you'd have to push the 175 SMK @ 2942 fps, which is probably seriously pushing it for that bullet.

    Now I know this is a web based calculator and real world conditions might differ greatly, but if this data is anywhere remotely close to being accurate, why wouldn't the military use the Lapua's vs. the SMK's?
    Eric - Wanna Be Long Range Shooter
    Rem 700 SS 5R Milspec .308 w/Leupold Mark 4 6.5-20x50mm
    Rem 700 SCBB2 .308 w/Burris Fullfield 2 Tactical 6.5-20x50mm

  2. #2
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    #1 Them digital charts ain't all they're cracked up to be sometimes.

    #2 The military runs on what it gets not what it wants.


    -snowy
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    Certified Super Civvie

  3. #3
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    The military runs what it's given but you don't have to mgcchkn. They do it becasue they have to. You were in the military and should know that. We don';t always get the best of the best and have to makle the best of the gear we get. Some advice though, don't fall into the rut I see some people in that they feel they have to use the exact load or gear the military does. I see a bunch of poeple wanting to get a load that shoots the exact same as the M118LR and I have to ask why would you shoot at 175 at 2580-2600fps when you can easily and safetly push them to 2700fps+? Find a good bullet that does what you need it to and use it. More than a few tactical match shooter have gone to the 155 as they do have a better BC than the 175 so when you can push them faster they will perform better than the 175s. Try them out if you wanted to. Not sure if you'll get over 2900fps with the 24" barrel on your 5R but even at 2850, which should be doable, they beat the 175. The Palma guys using them use like 30" barrels to get higher speeds.

  4. #4
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    I've used the 155 Lapua for many years in my 308. Started off shooting 175 SMK's and they were alright but I really had to push them hard to ensure that they stayed super at 1000.

    Our Modified Target Rifle class here in New Brunswick only allows us to shoot scoped 223's or 308's. I found the 155 Lapua's gave me a ballistic advantage over the guys running 175's. It's an impressive bullet.

    SG
    aim small....miss small

  5. #5
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    Interesting thread with great information.

    Maybe a dumb question, but ... for those who've had experience loading & shooting both, how do the 155gn SMK HPBTs compare to Lapua's 155gn Scenars (in terms of accuracy, consistency, etc.).

    I've never tried the Scenars, but have several boxes of the 155gn "Palma" SMKs on order. Thanks!
    "Only accurate rifles are interesting."

  6. #6
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    Look at the BC of the Sierra 155 Palma vs the Lapua 155 scenar......The lapua leaves the 155 Palma in the dust. I have shot both and the Lapua is the better bullet. I am fixing to order 500 berger 155 VLDs and see how they work as the Lapua's get hard to find at times (like now).

    My favorite bullet is the 190VLD from berger with a BC of 0.574. I push mine to 2660fps in a 22" barrel. It is one wind bucking bullet.

    In my fathers rifle we had noticed the 155 scenar tends to "ride" a head wind sometimes at 1K and not drop like it should, or other bullets do. If you cut open a 155 scenar there is not much lead in the front of them and they are longer than a 175SMK.

  7. #7
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    caver101: Thanks for the info.
    "Only accurate rifles are interesting."

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