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Mossberg 800A load

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Unread 01-27-2009, 10:14 PM
Silver Member
Join Date: Oct 2008
Location: Bryan, Tx
Posts: 284
Mossberg 800A load

I am reloading for an older '66 Mossberg 800a .308 WIN. My lands start at 2.954 with this particular bullet. However, the chamber will not allow anything longer than a 2.75 (0.05 shorter than the recommended 2.80 max overall length for 308WIN). That is a 2 tenths "jump" to the lands and longer jump than I have ever had to leave. Is this throat erosion, or were these rifle built to handle larger jumps? Factory ammo measures 2.69 and clears easily. It is still a heck of a hunting gun and patterns well considering the heavy trigger.
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    Unread 05-27-2009, 11:14 PM
    Junior Member
    Join Date: May 2009
    Posts: 6
    Re: Mossberg 800A load

    i use the same gun with hornady 165gr sp,

    i sit back .15 off the lands

    my most accurate load on imr-4895 is 40.3gr

    using cci 200 primers
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    Unread 05-27-2009, 11:23 PM
    Junior Member
    Join Date: May 2009
    Posts: 6
    Re: Mossberg 800A load

    ok so my smith said that the gun was built to the max spec to accept any ammo. the best thing to reduce chamber shock is to neck size and not trim length but it is ok to have a .20 jump but be cautious about jamming as it can increase chamber pressure outside of acceptable limits.
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