Mossberg 800A load

Discussion in 'Reloading' started by nheninge, Jan 27, 2009.

  1. nheninge

    nheninge Well-Known Member

    Messages:
    284
    Joined:
    Oct 20, 2008
    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.
     

  2. themonkeymixer

    themonkeymixer Member

    Messages:
    6
    Joined:
    May 27, 2009
    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
     

  3. themonkeymixer

    themonkeymixer Member

    Messages:
    6
    Joined:
    May 27, 2009
    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.