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Thread: 7-30 waters? Need good data for 21" barrel

  1. #1
    GunLoad Trainee
    Join Date
    Oct 2008

    Thumbs up 7-30 waters? Need good data for 21" barrel

    Anyone out there got any good poop for a 7-30 waters, All of the reloading manuals i have only give reloading data for T/C barrels 10" 14" I have a T/C 21" carbine. I have so far reformed 30-30 cases and fire formed them using IMR 3031 30.5 with Sierria 120 SP. So now I have a couple of boxes of 7-30 I need to get some serious load data. I was was surprised at what printed on paper the results of the fire forming.
    Less than 2" at 100 yds. So now what? will it get better. YES it will
    From the data that I do have Can I assume that for every 4" of barrel the FPS will increase ie 7-30 data Lyman 47th Edition IMR 3031 30.5 gr T/C barrel 10" 1811 fps,14" barrel 2063 fps; that is a 252 fps increase over the 10" barrel. so a 18" barrel should have 2315 fps, etc for each 4" inch of barrel length.

    "BOHICA":" Bend over here it comes again"

  2. #2
    Great Master kodiak1's Avatar
    Join Date
    Dec 2005
    Alberta Territory


    bunnybuster when I reload 44 Mag and 357 Mag the loads in the carbine maual and the pistol manual (speer) are the same. Yes you will gain velocity with the longer barrel and you might be close with your theory of figuring.
    Start with the loads given, chrony if you have one and then watch your brass as you work up your load.
    I am in the process of gettin me a 14" 7-30 and can't wait to try it.
    Let me know how you make out and what you fine.

    Thanks Ken.

    Love to Live, Live to Shoot!
    Live by the Gun...Die by the Gun...

  3. #3
    Dogs Like Him versifier's Avatar
    Join Date
    Dec 2005
    New Hampshire


    Contact Sierra Tech Support directly. They will give you the information you are looking for. 1-800-223-8799
    "Stand your ground.
    Do not fire unless fired upon.
    But if they mean to have a war let it begin here."
    - Capt. Parker, Lexington Militia, April 19, 1775

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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
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