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Thread: Your opinion needed on 40 cal

  1. 09-12-2022, 07:18 PM #1
    wallacem
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    Your opinion needed on 40 cal

    I have this Taurus PT640 Pro 40 cal. Bought it new, and it has always shot low, about 8" at 8 yards. Tried to find a new adjustable rear sight, but can't find one, it seems they say Taurus groove is a bastard size. Filing down the front sight won't work either, would take filing away almost all the sight. I think that if I load 180 gr cast bullets with 4.4 gr of bullseye it would be about 750 fps and might raise the point of impact rup.. What do you think? Wallacem inGa
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  2. 09-12-2022, 08:45 PM #2
    The Dar
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    You haven't mentioned the weight of bullet that is shooting low. A heavier bullet will impact higher.
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  3. 09-16-2022, 04:04 PM #3
    David2011
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    A lower velocity will also raise the point of impact. The difference in my 14” 44 Mag Contender going from 850 FPS 44 Special loads to 1600 FPS Magnum loads with the same boolit is huge. The reason is that the slower boolit stays in the barrel longer, causing the gun to move more before it clears the barrel.
    Sometimes life taps you on the shoulder and reminds you it's a one way street. Jim Morris
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  4. 09-16-2022, 05:05 PM #4
    MT Gianni
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    Make sure that at least two other shooters have the same problem. Another brands sight that is loose in the slot can be shimmed to a tight fit.
    [The Montana Gianni] Front sight and squeeze
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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check