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Thread: New/old #7

  1. #1
    Boolit Master
    Join Date
    Mar 2005
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    maine
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    New/old #7

    Been shooting some old tn made aa#7,made in 80,s id say,,payed 8 bucks a pound for it!!
    Anyhoo,,im running low and picked up some new western made #7.
    How close are these to each other?
    I have a splendid load for my 9mm,wonder if the new stuff will shoot as good,,,

  2. #2
    Boolit Master
    jimkim's Avatar
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    I think the formula has remained the same. I would start over with the load development though. It should be about the same as powder from different lot numbers.

    Sent from my SM-A515U using Tapatalk

    US Govt mantra. if it's moving tax it, if it's still moving regulate it, if it stops moving subsidize it

  3. #3
    Moderator Emeritus


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    The rule has always been if you change lot numbers reduce by 10% and start again. I would do at least that.
    [The Montana Gianni] Front sight and squeeze

  4. #4
    Boolit Master
    winelover's Avatar
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    I used up 8 pounds of 80's vintage and replaced it with a new jug. It didn't behave the same. I had to reduce the load by a full grain in my 9 mms. Accurate powders have a reputation for inconsistent lots.

    Winelover

  5. #5
    Boolit Master
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    The problem with Accurate Powder (fka Accurate Arms) is that it had several different producers over the years

    If your old No. 7 was made in Belgium (which I don't think it was in the 80s), then the Belgian lots are virtually identical to the newer lots that are made at the St. Marks plant in FL. At least it was for 40 S&W and 10mm and my chronograph. If it is the even older Israeli vintage (or other), I don't have experience with it, and the advice to re-work the loads is sound.
    "There is nothing like looking, if you want to find something."
    ~Thorin Oakenshield

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check