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Thread: GMX searing depth

  1. #1

    GMX searing depth

    What is the correct seating depth. I like to crimp into the cannelure, but on these you have two groves. With the top one it seems the bullet is seated very deep in the case. Advise please. I am using the 139g Hornady GMX.

  2. #2
    You want the best concentricity, so if the ogive is inside the neck thats not good likewise the base or boat tail should be below the bottom of the neck, then you also need to think about freebore. Changing depth will alter pressure too. If neither grove matches up you could just crimp where it suits.

  3. #3
    Calibre?

  4. #4

  5. #5
    S.A.A.M.I Spec for 7mm-08 and 284 Winchester overall cartridge length is 2.800". You should consider getting a manual though!
    Baguio

  6. #6
    Quote Originally Posted by Heym SR20 View Post
    7mm
    I started looking at all the 7mm calibres in the Hornady book and got bored...go on, give us a clue as to the chambering as well as the calibre...

    7mm-08 2.775"
    7x57 3.000"
    284W 2.960"
    280 REM 3.280"
    7x65 3.350"
    7 REM SAU 2.770"
    7 REM Mag 3.290"

    Alan

  7. #7
    Looking at pictures of hornady ammo, they crimp into the top one. I'm not sure how that correlates to oal though?

  8. #8
    I am looking at both 7x57 and 7x65R. For the 7x57 its perfect for 3.00" OAL if seated at the top cannelure, but in the 7x65 I am currently using the flat base Horady softpoint seated in the cannelure, but the GMX looks to be seated deeper. I am quite keen to keep to same seating depth so don't have to faff with adjusting things each time.

    I use IMR4831 - 51.5g in the 7x65R

    Haven't started working up a 7x57 load but erring on the side of IMR4350

  9. #9
    Quote Originally Posted by Heym SR20 View Post
    I am looking at both 7x57 and 7x65R. For the 7x57 its perfect for 3.00" OAL if seated at the top cannelure, but in the 7x65 I am currently using the flat base Horady softpoint seated in the cannelure, but the GMX looks to be seated deeper. I am quite keen to keep to same seating depth so don't have to faff with adjusting things each time.

    I use IMR4831 - 51.5g in the 7x65R

    Haven't started working up a 7x57 load but erring on the side of IMR4350
    PM sent

    Alan

  10. #10
    Quote Originally Posted by Heym SR20 View Post
    I am quite keen to keep to same seating depth so don't have to faff with adjusting things each time.
    Seriously??!!??? It's too much of a chore to adjust a seating depth for a different bullet?? Did someone set up you dies for you when you started reloading? ~Muir

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