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Thread: Different powders for frangible and FMJ

  1. #1
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    Different powders for frangible and FMJ

    OK, so my Sierra manual shows the same powders and load data for a given bullet weight regardless of whether the bullet is frangible or not. However my Lee manual splits them up, e.g. it list about 25 powders for 55gr jacketed but only 12 for frangible.

    Does it make any difference whether the bullets are frangible or not? A friend asked for some load data for 65gr 243 frangible but my Lee book doesn't have any information for 243 frangible. Can I just use the data for 65gr FMJ?

    Cheers!

  2. #2
    Short answer is yes you can use the same 65gr data

    There will be some difference so best advice (as usual) is start with the minimum load and work up from there.
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  3. #3
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    On further investigation, some powders are listed for 55gr frangible and FMJ, e.g. Varget. However the maximum load listed for frangible is less than the starting load for FMJ. Is this something to do with the risk of the of frangible rounds breaking up at higher velocities?

  4. #4
    Quote Originally Posted by a1baz View Post
    On further investigation, some powders are listed for 55gr frangible and FMJ, e.g. Varget. However the maximum load listed for frangible is less than the starting load for FMJ. Is this something to do with the risk of the of frangible rounds breaking up at higher velocities?
    That's what frangible bullets are supposed to do mate. I think you may be confusing the term frangible with expanding a1baz. Frangible bullets are a sort of extreme expanding bullet and normally used for special purposes. These bullets are constructed from sintered material and turn almost to dust on impact. While expanding bullets used for sporting purposes are designed to expand in a controlled almost predictable manner within certain velocity parameters.

    With regard to reloading data some companies supply far more specific information than others. Just as long as you stick within recognised load guidance to develop your load you wont go far wrong.
    Last edited by 8x57; 01-05-2016 at 21:25.
    It's the calibre of the shooter that counts not the calibre of the rifle.

  5. #5
    Quote Originally Posted by a1baz View Post
    On further investigation, some powders are listed for 55gr frangible and FMJ, e.g. Varget. However the maximum load listed for frangible is less than the starting load for FMJ. Is this something to do with the risk of the of frangible rounds breaking up at higher velocities?

    don't read too much into the load data, it is there as a guide
    they are giving you the range in their rifle, using their components on a specific day and temperature

    your rifle might see max loads and pressure 5 gr above theirs...or 5 gr below!

    the bullets don't know they are frangible and unless you are using an extremely fast twist rifle and pushing them at 4k fps plus....you are unlikely to see the awesome phenomenon that is bullets exploding in mid air as they disintegrate

    (although I struggle to believe this video...!)


    Last edited by bewsher500; 02-05-2016 at 13:07.

  6. #6
    4k rpm?
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  7. #7
    ha,
    sorry, brain and fingers not connected

    FPS

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