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Thread: u.s. and u.k. ft/lbs

  1. #1

    u.s. and u.k. ft/lbs

    i have been having a look at factory rounds to use in my new .243 and which would be good on fox as well as being legal for roe, ive had a look at fedral, winchester and hornady ammo and i'm working on and please correct me if im wrong to be legal i need a minimum of a .240 producing 1700 ft/lbs at the muzzel which i always thought was going to be about the 80gr mark but all above makes are claiming over 1800 ft/lbs even on there 55gr bullets and wondered if u.k. and u.s. ft/lbs are both the same un-like u.k. and u.s. gallons

  2. #2
    same
    in order to get the lighter bullets up to the limit they can clock them up to much higher MV

    this is quite handy
    http://www.airhog.com/convert.htm

  3. #3
    Quote Originally Posted by sir-lamp-alot View Post
    i have been having a look at factory rounds to use in my new .243 and which would be good on fox as well as being legal for roe, ive had a look at fedral, winchester and hornady ammo and i'm working on and please correct me if im wrong to be legal i need a minimum of a .240 producing 1700 ft/lbs at the muzzel which i always thought was going to be about the 80gr mark but all above makes are claiming over 1800 ft/lbs even on there 55gr bullets and wondered if u.k. and u.s. ft/lbs are both the same un-like u.k. and u.s. gallons
    You seem to have misunderstood what ft/lbs are. The ft/lb energy figure is a function of velocity and bullet weight in relation to each other. To achieve a given energy level you can either get there using a light bullet at high velocity or a heavy bullet at a lower velocity.
    You can't say muntjac without saying, Mmmmmm.

  4. #4
    i fully understand what ft/lbs are and altho i dont know the formula i understand how ft/lbs are calculated in relation to mass and velocity i was just under the impression that a .243 cartridge was unable to create the velocity needed to push a bullet under 80gr over 1700 ft/lbs hence ive questioned the u.k. and u.s. ft/lb scale but it seems to be after a bit of investigation that they are the same thing but many thanks for your help tho

  5. #5

  6. #6
    US and UK only go out of sync on volume.

    1 US Pint is 16oz by their volume measure but 20 oz by ours.

    Weight is the same.

    Stan

  7. #7
    Quote Originally Posted by smullery View Post
    US and UK only go out of sync on volume.

    1 US Pint is 16oz by their volume measure but 20 oz by ours.

    Weight is the same.

    Stan
    No. A US pint is 16 (US) fluid ounces while a UK (Imperial) pint is 20 (Imperial) fluid ounces, so is almost 25% heavier. It is not quite 25% heavier because the US fluid ounce is slightly larger (by about 4%) than the Imperial fluid ounce.

    This is because the Imperial system is based on a gallon being the volume of 10 lbs of water, divided into 8 pints of 20 fluid ounces whereas the US system is based on an earlier definition of a gallon as the volume of 8 lbs of wine, divided into 8 pints of 16 fluid ounces. The Imperial fluid ounce is the volume occupied by 1 ounce of water while the US fluid ounce is the volume occupied by 1 ounce of wine; as wine is less dense than water, the US fluid ounce is slightly larger.

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