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Thread: Ballistics: 10mm Auto Cartridge

  1. #1
    Boolit Mold
    Join Date
    Mar 2020
    Posts
    1

    Ballistics: 10mm Auto Cartridge

    It appears that many 10mm auto hunters-- prefer the 200gr and 220gr bullets.

    The 155 and 180gr have more energy at ~100ish yards than the 200, when using velocities from a reloading manual. I didn't run the 220gr.

    Is there a terminal performance gain that cannot be seen on paper when using a 200 or 220gr bullet in the 10mm auto, compared to the 155 or 180?
    Maybe just a tougher bullet construction?

    Thank you

  2. #2
    Boolit Master
    Join Date
    Apr 2017
    Location
    Minnesota
    Posts
    3,262
    Energy means nothing. 10mm auto was designed for a 200 grain bullet, so you are likely to see many loadings with that. 180 grain works great, 200 works great, 220 works great. Worry about the particular bullet, not necessarily the weight. 40 caliber bullets under 170 grains are almost always fast expanding, low penetration bullets not well suited to hunting. In a solid cast bullet, a 220 grain should penetrate more than a 180 grain, although both will drive through about twice as far as any hunter needs. In an expanding cast bullet, the added weight helps penetration. I often like heavier bullets because they are more accurate, but this is not always the case, only a general association of my own experiences.

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check