[jawjaboy]

I went to a Scheels in Colorado to check-out new boxes of Hornady CX factory ammo to see if those bullets had a crimp on the ballistic tip. I was only able to find 6.8mm SPC 100 CX and 7mm-08 139 CX ammo on the shelf. I open the boxes and found there was no crimp on the ballistic tips. This is good news!

100gr CX Component Lot # 2212103

View attachment 77672

I bought 4 boxes of Hornady 6.8 SPC CX yesterday in South Georgia lots 949179 and 4872223. No crips on the tips on any of the bullets as well.

 

[jawjaboy]

Hornady 100gr CX Update
...
I will keep you advised as the situation evolves. I need to buy a box of factory ammo and test it to verify if there is any difference in terminal performance. This is too big an issue to not ensure it is fully understood.

View attachment 78234

Thanks for the update. According to the ballistic tables I've run on the factory CX the no expansion threshold is starting at or before 100 yards. That ain't good. That would explain, assuming the factory ammo bullets match the ones you have, the lack of stopping power I experienced. I'm particularly interested in the test results of the factory ammo so please do a test on it.


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[jawjaboy]

I've been unable to find a box of CX locally. There are some on-line but shipping make the cost soar. Would anyone be willing to pull five (5) 100 gr CX bullets and contribute them for testing? If so, please send me an IM. Thanks for the consideration.

IM send.


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[jawjaboy]

The chrono results for the lot of ammo (Lot # 949179) from which I supplied the pulled bullets for Xman's test is attached.

The particulars are:

Rifle: PSA 6.8 SPCii 18" 1:11 twist
Suppressor: SilencerCo Omega 300
Chronograph: Oehler 35p
Distance from muzzle: 10 feet
Altitude asl: 295 feet
Temperature: 51 deg F
Humidity: 58%
Pressure: 30.10 inHg

I will add my anecdotal observations from the field on several hogs and a coyote with the Hornady 6.8 SPC CX 100 grain are consistence with Xman's findings. The one deviation with my observations from his results is it appears that the 6.8 SPC CX 100's failure to expand may occur at shorter distances, under 150 yards, possibly because hogs / coyotes flesh may have less obstructive media effects, from Xman's test media, on the CX 100 hence less expansion and lethal terminal performance. Once again this is anecdotal but to my eye I've noticed a difference in shot hogs' and coyote's reactions from Hornady 6.8 CX 100 versus both S&B 6.8 SPC PTS (Red Tip) 110 grain and IMI Systems Razor Core 5.56 77 grain HPBT-Match (Sierra MatchKing) ammo. They just seem more like a poor shot placement or FMJ pass through than with the other ammo I've used.

Bottom line: I will be removing the tip from the CX 100. When I run out of these I'll be using the S&B Red Tips until I get my reloading online with the Hornady 120 SST bullets.


JBM - Calculations - Trajectory JBM - Calculations - Trajectory 1/1

Trajectory
Input Data
Ballistic Coefficient:	0.303 G1	Caliber:	0.277 in
Bullet Weight:	100.0 gr
Muzzle Velocity:	2648.0 ft/s	Distance to Chronograph:	10.0 ft
Sight Height:	3.00 in	Sight Offset:	0.00 in
Zero Height:	1.75 in	Zero Offset:	0.00 in
Windage:	0.000 MOA	Elevation:	0.000 MOA
Line Of Sight Angle:	0.0 deg	Cant Angle:	0.0 deg
Wind Speed:	10.0 mph	Wind Angle:	90.0 deg
Target Speed:	10.0 mph	Target Angle:	90.0 deg
Target Height:	12.0 in
Temperature:	51.0 °F	Pressure:	30.10 in Hg
Humidity:	58 %	Altitude:	296.0 ft
Vital Zone Radius:	5.0 in
Std. Atmosphere at Altitude:	No	Pressure is Corrected:	Yes
Zero at Max. Point Blank Range:	Yes	Target Relative Drops:	No
Mark Sound Barrier Crossing:	No	Include Extra Rows:	No
Column 1 Units:	1.00 in	Column 2 Units:	1.00 MOA
Round Output to Whole Numbers:	No
Output Data
Elevation:	9.678 MOA	Windage:	0.000 MOA
Atmospheric Density:	0.07709 lb/ft³	Speed of Sound:	1107.8 ft/s
Maximum PBR:	315 yd	Maximum PBR Zero:	272 yd
Range of Maximum Height:	159 yd	Energy at Maximum PBR:	718.5 ft•lbs
Sectional Density:	0.186 lb/in²

Calculated Table
Range	Drop	Drop	Windage	Windage	Velocity	Mach	Energy	Time	Lead	Lead
(yd)	(in)	(MOA)	(in)	(MOA)	(ft/s)	(none)	(ft•lbs)	(s)	(in)	(MOA)
0	-3.0	***	0.0	***	2658.1	2.399	1568.6	0.000	0.0	***
50	1.4	2.7	0.3	0.6	2509.0	2.265	1397.6	0.058	10.2	19.5
100	4.5	4.3	1.2	1.1	2364.8	2.135	1241.5	0.120	21.1	20.1
150	6.0	3.8	2.8	1.8	2225.3	2.009	1099.4	0.185	32.6	20.7
200	5.7	2.7	5.1	2.4	2090.5	1.887	970.2	0.255	44.8	21.4
250	3.4	1.3	8.2	3.1	1960.4	1.770	853.3	0.329	57.9	22.1
300	-1.1	-0.3	12.2	3.9	1835.5	1.657	747.9	0.408	71.8	22.8
350	-8.2	-2.2	17.1	4.7	1716.0	1.549	653.7	0.492	86.6	23.6
400	-18.2	-4.4	23.1	5.5	1602.5	1.447	570.1	0.583	102.6	24.5

 

[jawjaboy]

Further comment to my post above. From a quality standpoint, excepting the bullet expansion issue, the chrono results and accuracy, sub MOA, demonstrates Hornady is really producing a fine product. This level or consistency in chrono results is approaching long range match quality.

So don't think I'm bashing Hornady with my comments about the CX 100 terminal performance. If they can fix the bullet expansion issue, I wouldn't hesitate using it and be very happy doing so.


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