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What caliber for shooting sports?

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Toster:
If I did do a .40, do you just load it down to help control the recoil?  A .45 has more of a thud recoil than a .40. At lest it seems that way to me.

Any good recipes for .40?  Do you guys just use cast bullets to help keep the cost down?

Also, do you think a STI Trojan http://www.stiguns.com/guns/Trojan5/Trojan5.html, or STI Sentry, http://www.stiguns.com/guns/Sentry/Sentry.html will be a good competition gun for a beginner? ?.I tend to buy a little nicer up front, and then I can rule out the ?this this dam gun thing?.

Chris Z:
For .40 competition I use a 180 gr. JHP with 5.3 grains of Winchester Super Field Powder. Very smooth shooting load, makes major power factor.

Some guys shoot cast 200 gr .40 bullets..... When you are reloading, the heavier the bullet, the less powder needed, in turn the less recoil. I shoot a Glock, so I tend to stay away from cast bullets.

I don't know the first thing about 1911/2011 pistols, but I will tell you STI seems to be the choice of competitors who use this type of gun.

JimP:

--- Quote from: Chris Z on November 30, 2009, 04:24:46 PM ---
When you are reloading, the heavier the bullet, the less powder needed, in turn the less recoil.


--- End quote ---

JimP:

--- Quote from: Chris Z on November 30, 2009, 04:24:46 PM ---
When you are reloading, the heavier the bullet, the less powder needed, in turn the less recoil.


--- End quote ---

Nope.  Not really.  It's just physics- While heavier bullets DO use less powder (because their inertia is greater -harder to get them started- pressure builds faster, so you need to use less.... equal charges with a heavier bullet = Very Bad Things in the Pressure Dept.) they will have more recoil, given an equal muzzle velocity. 

Newton's Laws of Motion:

I. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.

II. The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. Acceleration and force are vectors (as indicated by their symbols being displayed in slant bold font); in this law the direction of the force vector is the same as the direction of the acceleration vector.

 III. For every action there is an equal and opposite reaction.

Recoil is the product of that third law.  It is the reaction of the bullet being pushed forward: the gun pushes to the rear.  Push a heavier bullet forward at a given speed = more recoil force, or push a bullet of a given weight forward faster = more recoil force.

Recoil is damped by the inertia of the gun (First law- the gun is at rest and will stay at rest until acted upon by the force of recoil...)  A heavier gun will resist recoil better than a light one..... shoot the same heavy .357 load in a 6" barreled GP100 and a Scandium J-Frame to test this :).

This concludes Dr. Egghead's physics Lecture for today.

David Hineline:
Going with 40cal in a single stack 1911 will hurt you by one round of capacity in IDPA, I would suggest if you want to shoot 40 you go with a high cap gun 1911 or other.

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