"You seem to have curious objections about me wanting to see how accurate my new gun can shoot. What's that all about?"
Well, you see, it's like this...
Your first question was something along the lines of what .40 caliber bullet is the most accurate out to 100-yards.
There are at least 19 different .40 diameter bullets available for the .40 S&W, and each one will act differently depending on the firearm, the powder (and the charge of that powder), the primer and the casing used. (Not even taking into consideration the difference that different lot numbers of the different components will have on the "accuracy" of your .40 S&W.)
Secondly, was your supposition that the .40 S&W is a 100-yard cartridge. It isn't. A 100-yard carbine cartridge would be in the class of the .30-30 Winchester or the .44 Remington Magnum. .40 S&W doesn't even come close to that catagory.
Then you made the statement that your .40 shoots 6" groups at 100 yards. Under no conditions is that considered "accurate" for anything coming out of a rifle barrel.
Your next statement was that it shoots exactly to the point of aim from muzzle to 100-yards. That is not true, and never will be true for ANY cartridge fired on earth. Simple high school physics proves that. Gravity causes ALL objects to fall at 32 feet per second per second.
For simplicity's sake, let's say your .40 bullet was moving at a muzzle velocity of 1000 FPS. That means that if the velocity were constant (and it sure isn't with ANY pistol bullet of that diameter) it would take a minimum of around 0.3 seconds to travel the 100 yards to the target. In that 0.3 seconds that bullet would drop several feet if launched parallel to the earth's surface.
Granted, it will not leave the barrel level to the earth, but will be placed in some sort of an arc, depending upon the height of your sights above the bore, and also the adjustment of those sights.
You then go on to say that your sights are 2" above the bore...that in itself would negate your previous statement that it shot POA all the way to 100-yards.
Code:
Range Velo Time of Energy Path Deflection Total Sight correction Target
city flight to at crosswind drop for setting new lead
LOS of 1.0 Mph zero range 10 fps
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·Yards fps s ft.lbs. in. in. MOA in. Clicks MOA yds ·
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| 0 1048 0.0000 439 -1.5 0.0 ----- 0.0 ------ ----- 0.00
X 10 1033 0.0288 427 0.0 0.0 0.03 0.2 0.0 0.00 0.10
| 20 1020 0.0581 415 +1.2 0.0 0.07 0.6 -22.4 -5.61 0.19
| 30 1007 0.0877 405 +2.0 0.0 0.10 1.5 -25.7 -6.41 0.29
| 40 995 0.1176 395 +2.5 0.1 0.13 2.6 -24.0 -6.00 0.39
M 49 984 0.1448 387 +2.7 0.1 0.16 4.0 -20.8 -5.20 0.48
| 50 983 0.1478 386 +2.7 0.1 0.16 4.1 -20.4 -5.10 0.49
| 60 972 0.1785 377 +2.5 0.1 0.19 6.0 -15.6 -3.91 0.60
| 70 961 0.2096 369 +1.9 0.2 0.22 8.2 -10.2 -2.56 0.70
| 80 951 0.2411 361 +0.9 0.2 0.26 10.9 -4.3 -1.09 0.80
| 90 941 0.2730 354 -0.4 0.3 0.29 13.9 +1.9 +0.47 0.91
P 96 935 0.2922 349 -1.4 0.3 0.31 15.9 +5.7 +1.43 0.97
| 100 931 0.3051 346 -2.2 0.3 0.32 17.3 +8.3 +2.08 1.02
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For the above calculations I used the Hornady 180 bullet at a muzzle velocity of 1048 FPS, and I set the sights at 1.5" above the bore.
As you can see, your bullet will drop 17" by the time it reaches 100-yards.
I have nothing at all against someone wanting to load the best ammunition to match their firearm, that is what reloading is all about.
But to make blanket statements, which are not fact and can be easily disproven, or to ask broad questions without giving any indication of the intended purpose, do not set well with me.
In addition, you could have done a little of the "scut-work" yourself before asking the question. The BC for almost every bullet is listed in the manufacturer's manual or on their website. If you had just simply looked at that data you could have decided to use the Hornady 180 grain HP/XTP bullet.
Then you could have asked something like:
"I am loading a .40 S&W for a carbine, and plan on using the Hornady 180 grain XTP bullet. Can anyone suggest a starting load? And, is this combination good for hunting medium and large game out to 100 yards, or for personal defense out to that range?"
And I wold have answered:
"Blue Dot From 7.9 grains to 8.8 grains
Winchester WSP Primer
And I would not consider that cartridge as a hunting load on any game past 25 yards, and for personal defense I would limit it to 50 yards."