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Can somebody help me with the ballistics of two different .308 bullets?

Discussion in 'Hunting' started by avs11054, Feb 1, 2013.

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  1. avs11054

    avs11054 Member

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    I am looking at .308 bullets on Federal's ammo and ballistics catalog. Specifically, I am looking at the 150 gr nosler partition and the 180 gr nosler partition. I am trying to determine what bullet to use for elk this coming year.

    My question is, why should I choose one over the other, and what do each of them do that the other does not do? The catalog says that the 150 gr is for medium game and the 180 gr is for heavy game, but I honestly do not see that big of a difference between the two. Maybe I just do not know what a big difference is.

    Velocity:

    150 gr
    50 - 2721
    100 - 2604
    150 - 2491
    200 - 2380
    250 - 2273
    300 - 2168
    350 - 2065
    400 - 1966
    450 - 1870
    500 - 1776

    180 gr
    50 - 2478
    100 - 2388
    150 - 2299
    200 - 2213
    250 - 2128
    300 - 2045
    350 - 1965
    400 - 1886
    450 - 1809
    500 - 1734

    Energy

    150 gr
    50 - 2687
    100 - 2466
    150 - 2067
    200 - 1888
    250 - 1721
    300 - 1565
    350 - 1421
    400 - 1288
    450 - 1164
    500 - 1051

    180 gr
    50 - 2455
    100 - 2279
    150 - 2114
    200 - 1958
    250 - 1811
    300 - 1673
    350 - 1543
    400 - 1421
    450 - 1308
    500 - 1202

    Also, what does a "nosler partition" mean. How is that different from a nosler ballistic tip?

    Thanks for the help
     
  2. jmr40

    jmr40 Member

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    The Partitions are designed to hold together and drive deep into larger animals like elk. The Ballistic tip is basically a hollowpoint with a plastic tip. They are designed to expand rapidly, but not penetrate deep. Not the best choice on elk. Of those 2 I'd forget the Ballistic tip and go with the Partition.

    Go to www.nosler.com and look up the bullets BC. Plug in the numbers here.http://www.hornady.com/ballistics-resource/ballistics-calculator. And you can figure out the ballistics.

    FWIW, I'd suggest either a 150 gr Barnes TTSX, or 165 gr Nosler Accubond. They both fly flat because of their aerodynamics, and hold together for good penetration. Basically you are getting the flat trajectory of the Ballistic tip, with a tougher bullet like the Partition.

    Using 165 gr Accubonds @ 2740 fps at the muzzle I can still get 2029 fps and 1535 ft lbs at 400 yards with about 31" of drop with a 100 yard zero.
     
  3. avs11054

    avs11054 Member

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    Thanks for the response and the suggestion. I guess another question I have is that I have read a lot of people who talk about needing a heavier bullet for elk. Of these two, why would I choose the 180 over the 150 when both travel roughly the same speed with the same energy.
     
  4. MutinousDoug

    MutinousDoug Member

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    Heavy bullets expend their energy differently than light ones, are more likely to break into larger pieces than lighter ones thus are likely to penetrate deeply after hitting large bone.
    So, two bullets of the same construction given the same energy, the lighter bullet is more likely to fragment, limiting penetration. This might be desirable on light game but less so on larger game where your bullet may encounter heavy bone before entering the vitals.
    I wouldn't hesitate to shoot 150gr bullets at elk if that's what I had. Every shot taken will yield different results but you want to take out both lungs on an elk and get an exit wound to track. So much easier that way.
     
  5. avs11054

    avs11054 Member

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    Awesome. Thanks for the answers. Those were exactly what I was looking for.
     
  6. jmr40

    jmr40 Member

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    Heavy bullets made of the same construction methods will penetrate deeper. With old 1800's technolgy going to a heavier bullet, was the only way to get deep penetration on large animals But not all bullets are designed the same. With newer bullets made in the last 15-20 years it is now possible to get lighter, flatter shooting bullets to outpenetrate old school bullets that are much heavier.

    The Ballistic Tips are designed to almost explode on impact and give very little penetration. They kill quick, if they get to the vitals, such as on a deer. But on a larger animal such as elk may break up before getting deep enough. A 180 gr Ballistic tip will penetrate deeper and do more damage than a 150 gr Ballistic tip. While they both my work on elk, they are not the best choice. A bullet has to hold together and penetrate deeper on a 700 lb elk in order to get to the vital organs than on a 150 lb deer.

    The Ballistic tips are made with a high BC to make them more aerodynamic. They shoot very flat at long range.

    The Partitions have a lower BC, so they lose more speed at longer ranges, but they are a tougher bullet that will not break up on impact. A great choice on elk even in lighter bullet weights.

    The Accubonds have a very high BC and maintain speed well at long range. They are also just as tough as the Partitions for deep penetration. Same with the Barnes bullets. A 150 gr Accubond, or Barnes TTSX will out penetrate and do more damage than even the 180 gr BallisticTip because they are a tougher bullet.
     
  7. avs11054

    avs11054 Member

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    So how would a nosler partition perform on a deer? Is there more of a chance that it would go through the deer without any expansion than a ballistic tip?
     
  8. natman

    natman Member

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    The Partition is really two bullets in one. The tip expands normally for a big game bullet. However expansion is limited by the partition, so it can only expand so far. It's an excellent bullet for really big game.

    The Ballistic Tip is all one piece and gives more rapid expansion than a Partition. Fine for varmints and maybe deer, but not what you want for elk.

    For elk the 180 Partition is the way to go. Because it is the same diameter as the 150, but has more weight, it has better sectional density, a measure of how far it will penetrate all else being equal.
     
  9. MCgunner

    MCgunner Member

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    The partition has a copper partition through the bullet that stops expansion before the core of the bullet is lost, insures penetration. The Ballistic Tip is like a hollow point with a plastic point installed, great for thin skinned game, though animals not so much. I find both to be accurate, but the BT is a boat tail, higher ballistic coefficient allow for better down range numbers and less drop.

    Partition (a pistol bullet)

    [​IMG]

    BT It's a lead free. I couldn't find a cut away of a lead boat tail BT. I really like the 150 BT in .208" on deer, fantastic and plenty of penetration. In fact, I use it on hogs, now. I load a Barnes 140 for hogs that is great, but I've found the BT works plenty well on 'em and has more than enough penetration.

    Nosler_Ballistic_Tip_Lead_Free_Cutaway.jpg
     
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