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Rifles, Bullets, Barrels & Ballistics Applied Ballistics



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Unread 02-07-2011, 12:23 PM
Gold Member
Join Date: Jul 2009
Location: Idaho
Posts: 581
Re: Velocity=Pressure?

that makes sense did not think about the bullet being long gone when the screens moved
I was reading on here somewhere and it said if the screens are moving it could give false reading.
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    Unread 02-07-2011, 06:07 PM
    Platinum Member
    Join Date: Aug 2003
    Location: NC, oceanfront
    Posts: 4,054
    Re: Velocity=Pressure?

    Make sure you're accounting for true muzzle velocity, to compare expected velocities.
    Here's a helpful thread on that: True muzzle velocity
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    Unread 02-07-2011, 10:53 PM
    Gold Member
    Join Date: Jan 2005
    Location: Searcy, Arkansas
    Posts: 700
    Re: Velocity=Pressure?

    One other factor that has not been mentioned yet in the "velocity / pressure" question is the effect of the burn rate of the powder.

    If your powder is too fast, it will create a pressure spike early in the bullets progression down the bore, then begin to taper off. That is why using a powder that is too fast will give you pressure indications, but velocities may be low. So in that case, more pressure does not equal more velocity.

    Another way to get a pressure spike is if you have a tight neck chamber which does not allow the case neck to expand and release the bullet. This situation can give you fits with pressure signs, while at the same time producing low velocities.
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    Unread 02-07-2011, 11:04 PM
    Gold Member
    Join Date: Jul 2009
    Location: Idaho
    Posts: 581
    Re: Velocity=Pressure?

    I am not seeing any signs of pressure
    Im running a max load according to hodgen
    but my vel is about 200 fps low so I thought I had read somewhere
    that it was safe to go hotter since I have not reached max Velocity yet
    but then I am aware that 200 fps is not a whole lot in the grand scale of things
    I am just trying to understand what this chrono info is telling me and what I can do to improve things
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