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Range cards for pistols run 10-200m at 10m increments, sub guns run 20-400m at 20m increments and rifles/MGs run 50-1000m at 50m increments. Some of these probably need adjustment. E-factor for each range is calculated from the listed velocity for the range. Cartridge used is listed on the range card as well so that anyone can recreate a chart at different ranges if they so desire. I'm currently giving the same treatment to some updated weaponry but there doesn't seem to be much interest in the other thread I posted in. |
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The only problem I see is the name of the Uzi carried over from the book. The Uzi No2 Mk B was a civilian version with a 16' barrel imported into the US from 1983 to 1989 and most where semi-auto only. It is not what would be considered "cool" to have in TMP as a player. Just the Name of Uzi is fine. Last edited by nuke11; 07-18-2019 at 06:34 PM. |
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#4
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I have been looking for some terminal ballistics data for shotguns. This is the best-recorded results with well-documented methods that I have seen thus far. It is a good starting place.
http://www.brassfetcher.com/Shotguns.../Buckshot.html |
#5
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Another site that helps with shotgun shot ballistics:
http://www.ctmuzzleloaders.com/ctml_...allistics.html |
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The biggest source of the discrepancy though is the choice of the round. I assume the Project has access to restricted rounds like the SS190. That is what give me an E-Factor of 11. |
#7
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I also found an error in my Excel file where I used "round" vice "roundup" in one calculation and am in the process of rerunning all of my range cards. EDIT (9/20/19) - The rounding error was only impacting E-Factor based on muzzle velocity. The down range values were calculating properly. Last edited by Desert Mariner; 09-20-2019 at 05:59 AM. |
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#9
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In my calculations, if the BC is clearly labeled by the manufacturer as G7 I used it. If there was any doubt (i.e. only one listed), I assumed it was a G1 BC. Luckily, most manufacturers (S&B included) list both and G1 works in a pinch as the two curves usually run close to each other. |
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My apologies, the original PDF I posted was an older version. This one identifies the type of BC used (G1 or G7) and includes photos for most of the weapons (Stoner photos seem to be few and far between).
You'll note that the 5.56 weapon's E-factors come out lower than those listed in TM-1-1. I don't know if this is an error in the 4E figures or if I just haven't found the right cartridge to bump up V0. I've given a similar treatment to numerous weapons for possible use in the equipment updates mentioned in 4E. They range from Sig P320s in 4 sizes and calibers to the FN SCAR series, HK UMPs and USPs plus some .45 Colt revolvers and lever guns for fun. EDIT - added the attachment that somehow didn't upload the first time Last edited by Desert Mariner; 07-20-2019 at 04:48 AM. |
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55 grain: BC .269 62 grain: BC .307 |
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55gr FMJ @987mps comes to E=14.5 62gr FMJBT @920mps comes to E=13.5 I'd have to treat the BC as G1 since they don't specify and that would align with other 5.56 rounds. The S&B 5.56 rounds I've checked include (these BCs are all G7): 55gr FMJ @1006mps BC=0.143 E=14.8 62gr DIM @945mps BC=0.143 E=13.9 63gr Tracer @915mps BC=0.143 E=13.4 69gr HPBT @920mps BC=0.148 E=13.5 E-factors shown calculated based on listed MV of cartridge, they will vary when barrel length of actual weapon is included. Side note: I have been attempting to limit the number of ammo producers in keeping with the Project's need for secrecy and to simplify logistics. |
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Example. Barrett M82A1A : "metallic sights" could read better as iron sights. They are technically metallic, but I've never heard it referred to as metallic sights. And I see what you noted as to E-factors. Most of the time when I'm doing a range card for my players I would use the stated MV of the firearm as the starting value and use the adjust charts from the software as the range card. For firearms I couldn't find a value I would use some charts found on the internet for general lengths to MV for different types of ammunition. |
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I’ve often wondered about the E-factor calculation itself. Is velocity and diameter the best indicator of ballistic damage? Rules state “Projectiles cause damage by virtue of the energy transferred into the target.” So why not utilize the projectiles energy (E=0.5*m*v^2) [m=bullet mass in grains; v=velocity] as a starting point to determine E-factor? Granted I have no idea how you’d scale the result to fit the current BP/damage system.
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