<strong>Jim wrote:</strong>
The "effective range" is just a measure of roughly how far a solid shot would go at the specified tube elevation. It is not a measure of the range at which the gun was practically effective. That is decided by the accuracy of the gun. The overall accuracy is is a combination of the accuracy of the tube itself and the skill of the crew in accurately operating the gun. The accuracy settings were determined by examining scores from a number of North-South Skirmish Association cannon competitions. By looking at the scores, the exact size of the targets, and the range, one can calculate the dispersion (group size). It is a truism of ballistics that the dispersion angle is constant and independent of range. By knowing the dispersion angle, the group size can then be calculated at any specific range using basic geometry. So the hit probability for all types except canister are based on modern and accurate data from real people firing real cannon. For canister we were not able to find any numerical data to base calculations on. For that I did a large series of calculations based on a range of dispersion angles to try and find the data that provided the best match with historical reports of effectiveness at various ranges. While individual shot will carry for 500 yards or so, the dispersion angle becomes so large that the casualty rate is tiny. We also found in early testing that with longer canister ranges, an infantry unit could wait at long range for a battery to exhaust its store of canister and take few casualties. The infantry could then advance with impunity. That's not the way it worked historically. The numbers we picked are not perfect, but they work well enough for the AI standing in for a trained artillery officer.
-Jim
Au contraire, there is an exceedingly large amount of contemporary accounts (real people firing real cannons in a real war!) available to dispute your findings and the statements of NSSA "experts" as I continue to beat the proverbial "dead horse" for recognition that the game, as fine as it is, continues to do injustice to the artillery! (Of course, we have all learned that an EXPERT is 1) anyone who is more than 50 miles from home, and 2) an "X" is an unknown quantity with a "SPERT" being a drip under pressure, etc.) Although I do not currently own a "gun" (and probably won't again at my age :dry: ), I have been fortunate to have owned and served on various pieces including a Napoleon, a 6 pounder gun and an original 3" Ordnance Rifle, but do not consider myself any type of "expert"....just an interested observor who has probably spent too much time "in the books!"
But in the spirit of the "dead horse", let's consider the following accounts (being careful not to ignore the preponderance of evidence already published in this thread supporting the need for increased ranges and accuracy). For example, let's start with the U.S. Army's own instructions to the cannoneers (which were subsequently copied by the Confederate War Department)from the "Table of Fire. Light 12-Pounder Gun. Model 1857" (Napoleon) chart posted on the inside lid of the limber chest as it states what type or round is to be used and when it is to be used:
"Use SHOT at masses of troops, and to batter from 600 yards up to 2,000 yards. Use SHELL for firing buildings, at troops posted in woods, in pursuit, and to produce a moral (sic) rather than a physical effect; greatest effective range 1,500 yards. Use SPHERICAL CASE SHOT at masses of troops, at not less than 500 yards; generally up to 1,500 yards. CANISTER is not effective at 600 yards; it should not be used beyond 500 yards, and but very seldom and over the most favorable ground at that distance; at short ranges, (less than 200 yards,) in emergency, use double canister, with single charge. Do not employ RICOCHET at less distance than 1,000 to 1,100 yards." At the bottom of this large sheet are the instructions: "(This sheet it to be glued on to the inside of the Limber Chest Cover.)" This same type of data was included in each limber for all different type of guns.)
Question: How much more definitive evidence and better authority is needed then the U. S. Army's own instructions, pasted on every limber chest for ALL guns? If we follow the U. S. Army instructions, the game range of cannister needs to be increased a minimum of 300 yards for canister and when under 200 yards, double canister...plus ranges of the other types of shell should be increased as well!
But, if you are still in doubt as to the "imperfect numbers", please pick and choose from any of the following (if more evidence is needed that the "numbers" need to be reconsidered, please ask):
http://civilwar.bluegrass.net/Artillery ... ister.html (Discusses the effects of canister and notes it could be fired up to 600 yards)
http://www.civilwarartillery.com/tables.htm (Information obtained from The Confederate Ordnance Manual pages 367-369 and The Artillerist Manual pages 455-462.)
http://thomaslegioncherokee.tripod.com/ ... ation.html (Photos of the various guns and their ranges)
http://www.willegal.net/iron_brigade/artillery.htm (A nice page describing the various types of Ordnance used during the war and accompanying ranges at the bottom of the page)
http://civilwartalk.com/plugins/p2_news ... icleid=288 (Understanding the differences in types of guns)
http://hmscivilwarproject.wikispaces.com/Canister+shot (Descriptions of the use of canister)
http://www.gallantpelham.org/articles/s ... ?id_art=82 (Good description of the composition of canister)
http://www.warbooksreview.com/war-books ... l-war.html (Notes canister at 400 yards)
Additionally, here are some contemporary books that provide additional information on ranges:
John Gibbon, "The Artillerist's Manual", D. Van Nostrand, 1860 (reprinted by Greenwood Press, Westport, Conn., 1970).
William E. Birkhimer,"Historical Sketch of the Organization, Administration, Materiel, and Tactics of the Artillery, United States Army", Thomas McGill & Co., Washington, DC, 1884.
Augustus Buell, "The Cannoneer", The National Tribune, Washington, DC, 1890.
Fairfax Downey, "The Guns At Gettysburg", David McKay & Co., NY, 1958.
L. Van Loan Naisawald, "Grape and Canister: The Story of the Field Artillery of the Army of the Potomac", Zenger Publishing Co., Washington, DC, 1960.
James C. Hazlett (et. al.), "Field Artillery Weapons of the Civil War", University of Delaware Press, 1983.
Gary Gallagher, Ed., "E. Porter Alexander, Fighting for the Confederacy", University of North Carolina Press, 1989.
Hopefully, all will find these sources interesting, as well as undeniable and reconsideration to the "imperfect numbers" will be taken under advisement. Personally, I have a tendency to rely more upon the published accounts of the actual participants than on modern-day artillerists who lack the military training of the '61-'65 men serving the piece and served daily for, perhaps, up to four years and witnessed the effects at ranges not typical of the 20th century target shooter with limited range.
As to infantry waiting for the artillery to exhaust their canister, fine! Let them wait, and wait, and wait, ad nauseum!
In conclusion, any artilleryman worth his salt, must be able to quote future Federal General Alfred Pleasanton who witnessed General Zachary Taylor observing Captain Braxton Bragg at Buena Vista:
"What are you firing, Captain?
"Cannister, sir."
"Double or single?"
"Single, sir."
"Then double it and give 'em Hell!"
Thanks for your time and understanding.
J :blink: