.308 BBT 155gr

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  • 2019-05-02 at 23:47 #489915
    tnt76
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      Last year I made the decision to buy a Texan in .308, despite the reviews of inaccuracy, I was up for the challenge, as a tinkerer.
      I ordered and received the 135 and 155gr BBT molds mid last year and finally received the rifle 8 months later.
      After a few little tweaks to the valve I’m getting the 135gr to 975fps and 935fps with the 155gr @ 3000psi

      Accuracy wise, the Texan is showing a liking for the 135gr at 50m, with 1-1.5 in groups (ok for a .308 Texan), I’m yet to stretch out to 100m.

      I have cast a couple hundred of the 135gr and they drop at around 132gr to 133gr with a 2% tin mix.  However the 155gr are dropping closer to 148 to 149gr. Is this out of the normal to drop 6 or 7gr below calculated?
      What has everyone else weighed their 155gr BBT’s.

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    • 2019-05-03 at 01:30 #511749
      rsterne
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        One of the other casters making the 155 gr. has his dropping between 150-151 gr. but I don’t know the alloy…. so that is definitely the correct weight range for that mould….

        Bob

        2019-05-04 at 04:36 #511750
        tnt76
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          Thanks Bob,  I did see one other caster on GTA getting a little heavier. I may try a fresh batch of pure lead and try. Just to make sure I haven’t added too much tin along the way somewhere. I have 6 BBT molds all up, and only the one dropping somewhat lighter than calculated.

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