Determining Model 640 Caliber

Determining Model 640 Caliber

This is a discussion on Determining Model 640 Caliber within the Defensive Carry Guns forums, part of the Defensive Carry Discussions category; Hey Guys- I just bought a model 640 and need to determine if I can shoot +p ammo in it. It is a pre-lock model ...

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Thread: Determining Model 640 Caliber

  1. #1
    Member Array JCook5003's Avatar
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    Determining Model 640 Caliber

    Hey Guys-

    I just bought a model 640 and need to determine if I can shoot +p ammo in it. It is a pre-lock model and only says S&W .38 Spl on the barrel but the previous owner said it was a +p model, but I was under the impression you could only shoot the ammo listed on the barrel.......opinions?

    -Josh


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    Call S&W, give them the Serial #. They can verify either way. Until then, I wouldn't shoot +P.
    Retired USAF E-8. Lighten up and enjoy life because:
    Paranoia strikes deep, into your heart it will creep. It starts when you're always afraid... Buffalo Springfield - For What It's Worth

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    All the modern, 1980's up, S&W's can shoot +P ammo.

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    Quote Originally Posted by 1 old 0311 View Post
    All the modern, 1980's up, S&W's can shoot +P ammo.
    +1! Spot on correct. I have a S&W M642 that I got a couple of years ago. No worries with any +P ammo and I have fired a lot of it thru that little piece. BUT, it's not any fun! test to see where it hits in your gun and then practice with standard pressure ammo. Practice a lot. Point of impact won't vary greatly at normal defensive range for this weapon. This isn't a 21 foot "Tueller Drill" kind of gun. More like contact to 10 feet. Typically I practice at about 6 feet at the indoor range where I go. I lock my elbows into my sides and form a good triangle. Lay my forefinger along the slide and take my "point" angle from that. Without changing anything I lay my finger on the trigger and squeeze the first shot. Watching the strike on the first hole, I alter the angle of the barrel and walk the rounds into the "X" until I can replicate it very rapid fire over and over for about 100 rds. I don't have CT grips on the gun, but I should probably put them on. I have them on my XD45 and they work as advertised.
    Former Army Infantry Captain; 25 yrs as an NRA Certified Instructor; Avid practitioner of the martial art: KLIK-PAO.

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    Member Array Alchemist77's Avatar
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    I have an early 90's gen 640, and it shoots suprisingly well for such a short bbl. 10-15yds is not problem for COM defensive shooting with it. +P JHP's work for carry purposes, but are not alot of fun to plink with. My bbl is not marked +P, but my understanding has been that it is rated for +P.... please do correct if I am wrong on that. Wadcutter reloads shoot pretty accurately out of the little gun for plinking and practice. My has larger rubber grips (Pachmyer ?) which makes it easier to fire, but little harder to conceal.

    Alchemist77

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    Member Array JCook5003's Avatar
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    Thanks for the advice guys, I will give S&W a call today.

    The sharp recoil on the aluminum guns is the reason I chose the all stainless, shoot standard 38 loads I can easily hit COM at 4 yards VERY quickly. Now I want to practice 2 rounds COM, turn to new target and 2 more COM.

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