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powder question

5mmgunguy
Not sure how to ask this question, but I'll try it this way. I'm still not getting consistent shot groups out of my 257 Roberts. I'm using Speer Grand Slam 120's behind Varget powder. My question is, could changing to a slower powder, such as IMR 4350 make any difference. I tried 4 different loadings tonight. 36.0 grains, which shot the worst, 34.0 grains, 33.0 grains, and 32.5 grains. About as good as I could get was about a 3" group at 100 yards. Not very impressive huh?
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Comments

6 comments

Date Votes
  • 5mmgunguy
    Just opened a can of 4350 and found about a 1/2" of brown dust on top. Sucked it off with shop vac and powder looks fine but am concerned that it may no longer be good. Checked 2 other cans and they looked fine and they were all stored in the same locker. All dated 8/1988. Any help would be appreciated.

    thanks

    Walt
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  • gunnut505
    Just the burning rate.
    You should never assume that because some source says IMR4350 is the same as H4350, so you can use data for either one on whatever you're loading. Powders have different numbers and data is usually tailored to the specific characteristics of the powder being evaluated. Please get one of those free handouts from the powder companies from your local gunshop; read all the fine print at the start of the manual about substituting one powder for another, and the possible disastrous results.
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  • 5mmgunguy
    refresh
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  • frisky-maddog
    http://www.lasc.us/RangingShot13-5.htm
    hello they compare aa scot 4100 to hodgdons lilgun

    http://www.accuratereloading.com/
    this has an area that may also help you
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  • k_townman
    If there is anything different in the names or numbers of powders, just assume that they are NOT interchangeable. PLEASE, DO NOT ever experiment with this. There is no such thing as being too safety conscious when it comes to reloading any type of ammo. OK? [:)]
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  • 5mmgunguy
    Thanks everyone, all excellent advice which I will heed!!
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