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777 Pellets. Why the size difference?

Discussion in 'Blackpowder' started by Redlg155, Sep 30, 2003.

  1. Redlg155

    Redlg155 New Member

    I just compared my Pyro 50 grain .50 cal pellets against my 777 50 grain .50 cal pellets and found out they were approximately 1/3 smaller. I do know that they eliminated the blackpowder ignitor pad present on the Pyro pellets, but even this does not make up for the difference in size.

    As I understand blackpowder and substitutes are measured in volume and not weight. Using this method the 777 pellets should be the same size as the Pyro pellets. Even if the individual grain size was smaller it would make no difference due to it being measured by volume and not weight.

    My only guess is that the volume is initially the same as a 50 grain Pyro pellet but is reduced during the compression process in making the pellet.

    Any ideas on this one?

    Good Shooting
  2. JPM63US

    JPM63US New Member

    Although someone from Hogdon may have a better answer, I suspect there is an inert additive used in the granular form to add bulk. This allows us to measure it with our BP volume measuring equiment. When making the premeasured pellets, they leave this inert substance out.

  3. smokemaker

    smokemaker New Member

    My best guess is the size difference is due to the fact that the two (P-dex and my new favorite 777) are completely different chemical compounds. 777 contains no sulfur (less volume) and is about fifteen percent more potent by volume than black or pyro. Oh, and I have good evidence that it's faster pressure spike helps to obturate heavy, fat, full caliber conicals. (recovered bullets showed far more imprinted rifling on the bullets). Anyhow, there's my two cents.

    "Don't judge me based on your ignorance"
  4. Redlg155

    Redlg155 New Member

    And for those curious, here is a reply from the folks who make the stuff.

    Dear Sir:

    777 PELLETS are of a size that produces the desired energy for the product. AS PYRODEX PELLETS & 777 PELLETS are not made from the same materials they will not be the same size.

    Good shooting,


    Mike Daly

    Customer Satisfaction
  5. ARperson

    ARperson New Member

    Since I just entered the wonderful realm of muzzleloading, I watched a video for the basics. They discussed the difference between the Triple 7 and others. The reason they gave for the difference in size is that, as smokemaker said, Triple 7 is more powerful per unit volume than the others (whether true BP or substitute). I just sighted in the ML at the range on Friday using the Triple 7. Where the loads would have called for 100 grains of regular BP or substitute, I only used 80 grains of the Triple 7 per recommendations because of the difference in power.

    And it cleans up great too.

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