Ballistics question

ronpaulFAL · March 06, 2012, 16:16

Alright, fellas. I am not a ballistics expert by a long shot, so I could use a little help. I am trying to figure out whether a 7.62 BDC or 5.56 BDC would more closely approximate the trajectory of full power 147-150 gr bullets fired from my 16" DSA SA58.

Normally I wouldn't have questioned this, but I have heard that the 16" barreled 308s tend to have ballistics more akin to a 5.56. Is there any truth to this?

**Jaxxas** · March 06, 2012, 18:40

I ran this data which should approximate nato loads, what's the velocity from your 16" barrel?

Deltaten · March 06, 2012, 22:45

It has been proved repeatedly here that there is no real-world difference between a mil-spec 7.62 and 5.56 trajectories when using the different SUIT cams. I find it reasonable to suspect that therefore, there is no discernible difference between the two, given similar ranges and zeros.

ronpaulFAL · March 06, 2012, 22:51

Makes sense. I've heard te same but never had a ballistics guru confirm it. Figured I would check with the experts before dropping a lot of money on glass.

Don't have a chrono but I have read the 16 inchers get about 2550-2600 at the muzzle. How do I read your chart?

Thanks guys. Be safe.

**Jaxxas** · March 06, 2012, 23:49

I assume you will be comparing the drops at various distances in the Bullet Path (inches) columns, here is the data at 2600 fps.

Illurian00 · March 07, 2012, 01:31

Live fire demo w/FA&L

http://www.youtube.com/watch?v=kuELz...layer_embedded

ronpaulFAL · March 07, 2012, 12:55

absolutely perfect. Thanks to jaxxas!

March 06, 2012, 16:16	#1
ronpaulFAL Registered FALaholic #: 65535 Join Date: Feb 2012 Location: somewhere Posts: 2,146	Ballistics question Alright, fellas. I am not a ballistics expert by a long shot, so I could use a little help. I am trying to figure out whether a 7.62 BDC or 5.56 BDC would more closely approximate the trajectory of full power 147-150 gr bullets fired from my 16" DSA SA58. Normally I wouldn't have questioned this, but I have heard that the 16" barreled 308s tend to have ballistics more akin to a 5.56. Is there any truth to this?

March 06, 2012, 18:40	#2
Jaxxas Don't Tread On Me! Bronze Contributor FALaholic #: 34933 Join Date: Mar 2008 Location: Arizona Posts: 3,175	I ran this data which should approximate nato loads, what's the velocity from your 16" barrel? __________________ JaXXas It's funny though, everywhere else I'm considered the lunatic fringe, on FAL Files I'm a moderate.

March 06, 2012, 22:45	#3
Deltaten Registered FALaholic #: 124 Join Date: Jul 2000 Location: Lancaster, PA USA Posts: 8,498	It has been proved repeatedly here that there is no real-world difference between a mil-spec 7.62 and 5.56 trajectories when using the different SUIT cams. I find it reasonable to suspect that therefore, there is no discernible difference between the two, given similar ranges and zeros. __________________ All or Nothing! Senator McCarthy was right! and as always......FYB!

March 06, 2012, 23:49	#5
Jaxxas Don't Tread On Me! Bronze Contributor FALaholic #: 34933 Join Date: Mar 2008 Location: Arizona Posts: 3,175	I assume you will be comparing the drops at various distances in the Bullet Path (inches) columns, here is the data at 2600 fps. __________________ JaXXas It's funny though, everywhere else I'm considered the lunatic fringe, on FAL Files I'm a moderate.

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March 06, 2012, 22:51	#4
ronpaulFAL Registered FALaholic #: 65535 Join Date: Feb 2012 Location: somewhere Posts: 2,146	Makes sense. I've heard te same but never had a ballistics guru confirm it. Figured I would check with the experts before dropping a lot of money on glass. Don't have a chrono but I have read the 16 inchers get about 2550-2600 at the muzzle. How do I read your chart? Thanks guys. Be safe.

March 07, 2012, 01:31	#6
Illurian00 Registered FALaholic #: 28599 Join Date: Apr 2007 Posts: 2,407	Live fire demo w/FA&L http://www.youtube.com/watch?v=kuELz...layer_embedded

March 07, 2012, 12:55	#7
ronpaulFAL Registered FALaholic #: 65535 Join Date: Feb 2012 Location: somewhere Posts: 2,146	absolutely perfect. Thanks to jaxxas!