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Thread: Bullet Brand/Pressure Differences?

  1. #31
    Join Date
    Feb 2003
    Location
    Tennessee
    Posts
    5,259
    OK, just to see if you've got this straight...Let's say your changing bullets from Sierra to Hornady - same weight. Do you increase, decrease or stay the same with your powder charge? Use any information available to make that decision.

  2. #32
    Join Date
    Apr 2017
    Location
    Ames, Iowa
    Posts
    492
    Quote Originally Posted by Wilbur View Post
    OK, just to see if you've got this straight...Let's say your changing bullets from Sierra to Hornady - same weight. Do you increase, decrease or stay the same with your powder charge? Use any information available to make that decision.
    Actually I went out and did that today with my .25-06. I used 117 grain Hornady boattails #2552 and Sierra 117 grain flat base #1640 Pro-Hunter since that's all I have on hand and I've had them for over 20 years so they aren't new manufacture. Tried 53.5 grains of IMR 4831 and 57 grains of IMR 7828 for each. Remington 9 1/2 primers. Serbian Prvi Pritizan brass. Essentially no difference in bolt lift, primer appearance. One case with 7828 and Sierra had a mild extractor mark on the case head, but no other indications of pressure.

    So for what I have, I'll use them interchangeably.

    I asked him by private message for more info. This was his reply.

    "Tom,

    I first noticed it with my 7mm Rem Mag going from 162gr SST to 160gr HPBT GameKing. The 160 SPBT GameKing was worse yet.
    This transfered over again in 7mm-08 with 140gr Ballistic Tip to 140gr GameKings, both HPBT, SPBT. Again worse with the SPBT.

    Then again in the 257 Roberts with 100gr bullets.
    Different cartridges, different volumes, different powders.
    I have contually had to develop different loads when shooting same weight Sierra's.
    Don't get me wrong. I really like Sierra bullet, and will continue to use them! Just realize a 100 gr bullet is not the same accross the board.

    Ken"

    So I expect that it's the type of Sierra that he's using. I will ask him if he made any changes to the powder weights, etc.

    With IMR 7828 Cases that had Sierra bullets are on the left in both pics. Designated pic A

    With IMR 4831 Designated pic B
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by antelopedundee; 07-30-2018 at 12:20 AM.

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