Cast Bullet Ballistic Coefficent Table

[Artful]

As I had difficulty in finding a listing of cast boolit BC's I searched some books and found the following information for those who are interested

Only internet link I had was
http://www.lasc.us/ConversionTables.htm

Quote:
RCBS Cast Rifle Bullet Ballistic Coefficients
22-055 FN .159
243-095 .258
257-120 .272
270-150 .327
7mm-145 Silh. .272
7mm-168 SP .306
30-115 SP .175
30-150 FN .220
308-165 Silh. .286
30-180 SP .293
30-180 FN .255
35-200 FN .243
357-180 Silh .210
375-200 FN .220
44-200 FN .130
429-240 Silh .186
45-300 FN .207
45-405 FN .303
45-500 FN .365[/Quote]



Originally Posted by Uncle Grinch
I'd be curious where the 6.5 x 55 would fall at in BC. The 140 ~ 160 grain range should be fairly efficient.


The Lyman 266469 at 1600 fps is .320. The 3rd GB 130 gr bullet is .25 at 2100 fps. Lyman's 266455 is .26 at 2000 fps.

Larry Gibson

Lyman 3rd edition cast handbook has in the back the following boolits listed

225107_.091
225438_.094
225415_.116
225462_.107

245496_.202
245497_.230
245498_.210

257420_.120
257312_.208
257464_.204
257418_.221
257325_.235

280468_.193
280473_.275
280412_.245

287448_.165
287346_.235
287405-.245
287308-.325

311359_ .181
311441_.143
311576_.172
311465_.163
311410_.239
311440_.134
311466_.250
301618_.300
311291_.202
31141__.220
311407_.270
311467_.320
311344_.340
301620_.379
311299_.377
311290_.305
311284_.332

311644 is .272 per mrbill2's info

323470_.187
323471_.475
323378_.410

375248_.290
375449_.315
375167_.315

.457191_.201
457122_.274
457124_.299
457193_.307
457102_.359
457406_.387
457125_.391
457132_.384

515141_.250


Lyman Pistol and Revolver Handbook

Ballistic Coefficent handgun bullets

454424-.210
454190-.269
45468-.105

429244-.201
429421-.209
429360-.169
429215-.188
429303-.105
429348-.065

410426-.235
410459-.150
410610-.158
41028-.160

358429-.286
358311-.228
358156-.213
358477-.183
358495-.096
358460-.145
356402-.146
358242-.154
358345-.121

257312-.185
257420-.160

225415-.162
225438-.120


Lyman 46th Edition Reloading Handbook list of Ballistic Coefficent


Projectile _ Higher than _ Med _ below Velocity
225107 _ 0.091@2400 _ 0.099 _ 0.108@1800
225438 _ 0.094@2400 _ 0.107 _ 0.122@1800
225415 _ 0.116@2400 _ 0.140 _ 0.168@1800
225462 _ 0.107@2400 _ 0.131 _ 0.152@1800

245496 _ 0.202@1600 _ 0.215 _ 0.230@1200
245497 _ 0.230@1600 _ 0.240 _ 0.260@1200
245498 _ 0.210@1600 _ 0.225 _ 0.245@1200

257420 _ 0.129@2200 _ 0.152 _ 0.180@1800
257464 _ 0.204@1800 _ 0.217 _ 0.234@1400
257312 _ 0.028@1800 _ 0.236 _ 0.273@1400
257418 _ 0.221@1800 _ 0.253 _ 0.296@1400
257325 _ 0.235@1800 _ 0.263 _ 0.263@1400

280468 _ 0.193@2200 _ 0.224 _ 0.254@1600
280473 _ 0.275@1800 _ 0.290 _ 0.310@1400
280412 _ 0.245@1800 _ 0.255 _ 0.270@1400

287448 _ 0.165@2000 _ 0.205 _ 0.245@1600
287346 _ 0.235@1800 _ 0.265 _ 0.305@1400
287405 _ 0.245@1600 _ 0.265 _ 0.285@1200
287308 _ 0.325@1600 _ 0.345 _ 0.365@1200

311359 _ 0.181@2000 _ 0.182 _ 0.182@1600
311441 _ 0.143@2200 _ 0.152 _ 0.163@1600
311576 _ 0.172@1800 _ 0.196 _ 0.220@1400
311465 _ 0.163@2200 _ 0.171 _ 0.195@1600
311410 _ 0.239@1600 _ 0.250 _ 0.265@1200
311440 _ 0.134@2200 _ 0.151 _ 0.171@1600
311466 _ 0.250@2000 _ 0.250 _ 0.260@1600
301618 _ 0.300@2400 _ 0.310 _ 0.305@1800
311291 _ 0.202@2200 _ 0.231 _ 0.250@1600
31141 _ 0.220@2200 _ 0.250 _ 0.280@1600
311407 _ 0.270@1800 _ 0.300 _ 0.325@1400
311467 _ 0.320@2200 _ 0.305 _ 0.300@1600
311334 _ 0.340@1800 _ 0.312 _ 0.275@1400
301620 _ 0.379@2200 _ 0.370 _ 0.362@1800
311299 _ 0.377@1800 _ 0.358 _ 0.390@1400
311290 _ 0.305@1800 _ 0.300 _ 0.275@1400
311284 _ 0.332@1800 _ 0.331 _ 0.335@1400

323470 _ 0.187@2200 _ 0.205 _ 0.225@1600
323471 _ 0.475@1800 _ 0.450 _ 0.425@1400
323378 _ 0.410@1600 _ 0.420 _ 0.430@1200

375248 _ 0.290@1600 _ 0.310 _ 0.325@1200
375449 _ 0.315@1600 _ 0.348 _ 0.375@1200
375167 _ 0.315@1600 _ 0.290 _ 0.270@1200

457191 _ 0.201@1800 _ 0.222 _ 0.240@1400
457122 HP _ 0.270@1800 _ 0.267 _ 0.265@1400
457122 _ 0.280@1800 _ 0.274 _ 0.274@1400
457124 _ 0.300@1800 _ 0.299 _ 0.275@1300
457193 _ 0.307@1600 _ 0.335 _ 0.365@1200
457102 _ 0.359@1600 _ 0.355 _ 0.350@1200
457121 _ 0.436@1600 _ 0.430 _ 0.420@1200
457406 _ 0.387@1600 _ 0.380 _ 0.370@1200
457125 _ 0.391@1600 _ 0.380 _ 0.380@1200
457132 _ 0.384@1500 _ 0.375 _ 0.370@1100

515141 _ 0.250@1600 _ 0.250 _ 0.225@1200

Please feel free to add any more you have give the source.

[w30wcf]

Artful,
Many thanks for your work on putting together the list of b.c's.

Regarding the 311644, I believe the b.c. would be closer to .330 if made in w.w which brings the weight to 202 grs. (my mold)

The reason I say that is that the nose profile is the same as the 180 RCBS which has a reported b.c. of .293. With the 12% increase in weight, the b.c. would be .328.

In actual firing test at 500 meters with my 788 30-30, at 2,200 f.p.s. launch velocity, the 311644 comes very close to the 311299 which has a reported .377 b.c.

w30wcf

[mrbill2]

Artful
Mr. w30wcf's numbers could be right on. The number I gave you was the answer to my B. C. question on another form. If this New Lyman Loading Book ever get becomes a reality, maybe they have included that info. Last I read, it should be out in Oct. They didn't give the year.

[mrbill2]

Artful
Just a update to the question about the BC of the Lyman 311644. Printed in the NEW Lyman cast bullet manual #4 the bc for that bullet is indeed "272"

[geargnasher]

I saw this a while back and searched it out and used it more than once, it's about time I posted a thanks! :drinks:

Gear

[Gar]

Here are some for Lee molds.
I started a spread sheet several years ago to try and save sometime looking them up.

Lee, 311-093-1R, .106, ,
Lee, 311-100-2R, .174, ,
Lee, 314-93-SWC, .100, ,
Lee, 358-105-SWC, .116, ,
Lee, 358-140-SWC, .142, ,
Lee, TL358-148-WC, .072, ,
Lee, 358-148-WC, .072, ,
Lee, 358-150-SWC, .117, ,
Lee, C358-158-SWC, .117, ,
Lee, TL358-158-2R, .207, ,
Lee, 358-158-RF, .160, ,
Lee, 356-102-1R, .105, ,
Lee, 356-120-TC, .123, ,
Lee, TL 356-124-2R, .164, ,
Lee, TL356-124-TC, .127, ,
Lee, 356-125-2R, .166, ,
Lee, 365-95-1R, .093, ,
Lee, 401-145-SWC, .117, ,
Lee, TL401-175-SWC, .141, ,
Lee, 401-175-TC, .141, ,
Lee, 410-195-SWC, .110, ,
Lee, 410-210-SWC, .119, ,
Lee, 429-214-SWC, .111, ,
Lee, C429-240-SWC, .124, ,
Lee, 429-240-RF, .124, ,
Lee, 429-240-2R, .196, ,
Lee, TL430-240-SWC, .169, ,
Lee, C430-310-RF, .218, ,
Lee, 452-160-RF, .090, ,
Lee, 452-200-SWC, .127, ,
Lee, 452-200-RF, .140, ,
Lee, TL452-200-SWC, .127, ,
Lee, 452-228-1R, .145, ,
Lee, TL452-230-2R, .189, ,
Lee, TL452-230-TC, .146, ,
Lee, 452-252-SWC, .136, ,
Lee, 452-255-RF, .210, ,
Lee, C452-300-RF, .233, ,
Lee, C476-325-RF, .256, ,
Lee, 476-400-RF, .271, ,
Lee, C501-440-RF, .296, ,
Lee, C285-130-R, .305, ,
Lee, C309-113-F, .199, ,
Lee, C309-120-R, .163, ,
Lee, C309-150-F, .264, ,
Lee, C309-160-R, .252, ,
Lee, C309-170-F, .268, ,
Lee, C309-180-R, .317, ,
Lee, C309-200-R, .352, ,
Lee, C312-155-2R, .268, ,
Lee, CTL312-160-2R, .276, ,
Lee, C312-185-1R, .247, ,
Lee, C324-175-1R, .216, ,
Lee, C329-205-1R, .361, ,
Lee, C338-220-1R, .250, ,
Lee, 379-250-RF, .250, ,
Lee, 457-340-F, .211, ,
Lee, 457-405-F, .225, ,
Lee, 459-405-HB, .250, ,
Lee, 457-450-F, .250, ,
Lee, C457-500-F, .278, ,
Lee, 459-500-3R, .443, ,
Lee, 515-450-F, .220, ,
Lee, 515-500-F, .283, ,

Now, anyone with Hensley&Gibbs data?

[WILCO]

Great info here. Thanks to all for posting. Just FYI, the Natchez shooting supply catalog has BC's listed for the LEE molds. I've used that as a reference more than once in the past.

[Doc Highwall]

I have been looking for the B.C. of SAECO moulds. The one I am most interested in is the #315 175 gr TCGC that I shoot.

[BAGTIC]

Remember that weights of cast bullets vary with weights. BC's also vary with weight . Variation will normally be proportionate witweight increase.

Also remember than BC varies vith velocity and continues to vary from muzzle to impact. Take all BC's with a cup of salt.

[shootingbuff]

Gracias mi' amigos!

:lovebooli

[shootingbuff]

Remember that weights of cast bullets vary with weights. BC's also vary with weight . Variation will normally be proportionate witweight increase.

Also remember than BC varies vith velocity and continues to vary from muzzle to impact. Take all BC's with a cup of salt.

Good point, but for most what is listed should be good/close enough. Even with good data and ballistic programs one needs to verify on the range and the conditions they are planning to shoot in.

[pbchunkr]

Hey all -

FWIW - can't say how accurate the results this gives, but:

Precision Ballistic Coefficient Estimator
http://www.uslink.net/~tom1/calcbc/calcbc.htm#calculator

Have fun. :bigsmyl2:

regards,

[tommygirlMT]

In truth --- the only real way to know what the B.C. of YOUR cast boolits and also which B.C. scale best applies to that particular boolit at the velocity range your pushing it --- (yes there are more then one B.C. scale) --- is to to find a good stable accurate load with low deviation on the muzzle velocity --- then move the chrony out to the 50 yard line and take another string --- then out to the 100 yard line and take another string --- and if your a really good shot and brave then do the same out as far as you dare --- then average out those strings and crunch the numbers

Basically you fiddle with the BC number with the input muzzle velocity until the results match your outputs on an external balistic calc program and there you have your BC --- while doing this and trying to reverse engineer the B.C. from real world data it will become very apparent why there are more then one BC scale

In fact I have found more then one cast boolit load combo that defies the balistic tables and don't seem to have any normal kind of B.C. scale curve --- in such cases using the mathmatical curve fitting function in a good graphing calculator sometimes works better then any ballistic calculator program when you have the raw data like this to crunch at your finger tips --- then apply the base physics formulas for projectile motion and use the equation that the graphing calculator came up with to build a function to quantify the drag quotient --- that usually puts me dead on way better then any ballistic calc program I've found yet --- so much so that I usually go straight to that and don't even bother with the conventional BC scales unless Im trying to comunicate with someone who only comprehends "BC" (and usually they don't realize there is more then on darn BC scale) and then I have to do things the old way in order to translate into their language because usually all they are going to do is plug it into some generic external balistic calc to know how much hold over to get themselves at least on the board at longer ranges --- especially true in the wheel gun hand cannon world (one of the worlds I live in)

[pbchunkr]

True enough, and B.C. also varies w/humidity, elevation & temperature, so even with a given load/gun/shooter combo, it won't be one number all the time.
But getting on the paper at various ranges is what most folks'd use it for, I 'spect.

[AZ-Stew]

This thread looks like a good candidate for stickyizing.

Regards,

Stew

[zardoz]

Figured to add one to this thread. A Lyman mould, that was not in the previous
list. In fact, it should be arriving this coming week for me.

This from the most recent Cast Bullet Handbook from Lyman.

Lyman 515142 515 grain B.C. 0.264

[Tom Myers]

This link should work a little better

http://www.uslink.com/~tom1/calcbc/calcbc.htm


Hey all -

FWIW - can't say how accurate the results this gives, but:

Precision Ballistic Coefficient Estimator
http://www.uslink.net/~tom1/calcbc/calcbc.htm#calculator

Have fun. :bigsmyl2:

regards,

[Wayne S]

This link should work a little better

http://www.uslink.com/~tom1/calcbc/calcbc.htm

I can't get it to take some numbers ?? can someone try and see \what Lymans 311365 turns out to be ? with the pointy nose it has to be higher than the 311299

[Tom Myers]

I can't get it to take some numbers ?? can someone try and see \what Lymans 311365 turns out to be ? with the pointy nose it has to be higher than the 311299

If you select the applicable radio buttons near the top of the calculator, the fields below will only accept the values that apply to those selections.

TommyGirl tells it like it is when it comes to estimating or calculating BCs.

I don't have either of Lyman's 311299 or 311365 bullets so I scaled up some values from images of the bullets, entered them into the online Precision Ballistics Calculator and imaged the results shown below.

The calculated value of the 311299 is lower than Lyman's published value but it has been my experience that real world BCs are usually not as high as most published BC values.

The Calculated value of the 311365 seems quite high and I have not seen a published or measured BC for this bullet. However, the values can offer a means of comparing a bullet BC to a bullet with known BC.

Hope this helps.


http://www.tmtpages.com/LinkSkyImages/forum_images/CalcBC/Lyman%20Mould%20311299.jpg

http://www.tmtpages.com/LinkSkyImages/forum_images/CalcBC/WebBC-311299.jpg



http://www.tmtpages.com/LinkSkyImages/forum_images/CalcBC/Lyman_Design_311365.Jpg

http://www.tmtpages.com/LinkSkyImages/forum_images/CalcBC/WebBC-311365.jpg

[stubert]

There is a reloading program called Load from a disc, that lists BC's for almost all of the boolits in thier database.( cast and jacket) They also have a printable chart that uses the nose profile to predict it.

[Marlin Junky]

The major problem with getting an accurate B.C. from "Precision Ballistic Coefficient Estimator" is that it doesn't consider Secant Ogives (on boolits) and will default to what looks like a Tangent Ogive if you try to insert the true "Ogive Radius in Nose Diameters" (for Secant Ogives).

MJ

[Tom Myers]

The major problem with getting an accurate B.C. from "Precision Ballistic Coefficient Estimator" is that it doesn't consider Secant Ogives (on boolits) and will default to what looks like a Tangent Ogive if you try to insert the true "Ogive Radius in Nose Diameters" (for Secant Ogives).

MJ

Your are right. The site is not equipped to handle a Secant Ogive nose profile. Although it is possible to calculate a secant ogive value with three separate diameters on the ogive, the diameter values and the linear distances from the base of the ogive to those diameters must be precise to within 1,000 of an inch to obtain any degree of accuracy. I managed to set up an adjustable jig that could position the bullet and calipers so that accurate measurements could be made to determine a Secant Ogive Radius but that was not adaptable to a website application.

One thing that you can do is, if you know for sure the actual secant ogive radius in nose calibers, is to increase the entry value in the ogive or nose length field in small increments until the calculated ogive radius matches your secant radius.

This will work up to a point. As the angle at the junction of the secant ogive and the base increases beyond 4 to 6 degrees, the increasing Secant Ogive Value does not continue increasing the ACTUAL ballistic coefficient value of the bullet. So this is problematic in that, without some fairly intensive math algorithms to determine that angle, one does not know precisely where to quit increasing the nose length.

An estimate is that if you increase the nose length on the calculator beyond 25%, the 4-6% limit will be passed and, approximately, a maximum 15% increase in actual BC will be observed. This is based on just a few instances so it could vary quite a bit over the broad spectrum of nose shapes and bullet weights.

Hope this helps.

[Wayne Smith]

I second the nomination for a stickie.

[BAGTIC]

Do any of these sources list the LOA of the cast bullets?

[Artful]

NOE 311247 FN Whisper/Blackout - BC as calculated by Moonie at .436
http://castboolits.gunloads.com/showthread.php?168173-NOE-311-247-FN-Whisper-in-a-1-10-twist-308&highlight=311247

[fatelvis]

Excellent info, thanks! Can anyone tell me what the BC is for Lyman's 358627? Thanks-

[Tom Myers]

Excellent info, thanks! Can anyone tell me what the BC is for Lyman's 358627? Thanks-

fatelvis,

I don't have a Lyman 358627 bullet but I do have a Lyman sketch of one so I scaled it out and entered the dimensions into the Precision Cast Bullet Design and Evaluation software (http://www.tmtpages.com/draw/draw.htm). Enclosed are the results of the calculations and drawings.

The estimated B.C. calculation is 0.2533.

Hope this helps.

http://www.tmtpages.com/LinkSkyImages/forum_images/Lyman_Mold_358627.Jpg

http://www.tmtpages.com/LinkSkyImages/forum_images/Lyman_Mold_358627_Rot.Jpg

http://www.tmtpages.com/LinkSkyImages/forum_images/Lyman_Mold_358627_215_gr_Sketch.Jpg

[fatelvis]

Thanks!

[Scharfschuetze]

I also would like to say "thanks" to the guys that typed out those BCs for all the different moulds. As noted, all BCs are approximate, but these numbers are a good place to start.

[Marlin Junky]

Has anyone derived a BC for SAECO 301 based on actual chronograph data?

MJ