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Loading the 300gr XTP for .44 Magnum

Discussion in 'Handloading and Reloading' started by daroccot, May 10, 2008.

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  1. daroccot

    daroccot Member

    Jan 22, 2007
    Rifle is Marlin 336 w/ micro groove.
    Bullets are Hornady XTP 300gr
    Powder W296
    Primer CCI 350

    I would like to end up using around 22 grains which is near what my manuals list as max (for pistol). The data for the rifle list ~20gr, however this is using the top cannalure to seat, which will reduce the effective case volume. However if you seat to the bottom cannalure (which would give an effective case volume as if you were using a 240 gr bullet) max loads are 22.5gr H110/w296 (speer #13).

    The question then becomes am I going to spike because i've now seated the bullet so that it contacts the rifling of the barrel? Previously I have seated to the bottom cannalure and loaded 20gr of w296 with no ill effect. Was the theoretical spike (of seating into rifling) avoided because of increased case capacity? I don't know.

    I've even seen some loads of 24gr w296 behind the 240gr XTP here on THR.org (same case volume as the 300gr seated to the bottom cannalure).
    If I want to work this load up, what is the reccomended increase interval of powder, in gr or % of load? What signs should I look out for with regards to pressure spikes? Would software programs like quick load be of more help in answering these questions?

    The Bullet:

    Dummy rounds carboned and chambered seated to different cannalures:
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