Range Report .308 Sierra MatchKing 175gr ballistic data/card

[alpha0815]

Just trying to get a general idea here. Does anyone have a table or data for 175gr SMK loads? Preferably factory loads. Found quite a bit of data out there for the FGMM 168 SMK from a 20" barrel, but nothing really for the 175.

Thanks in advance.

 

[ericthebeard]

Just go run some general numebrs from JBM (JBM - Calculations - Trajectory).

Pick out the Litz 175SMK from the bullet list and it'll fill in all the bullet-specific params, and swag your rifle data with a 2550 fps MV and check out the range card provided... Fiddle with whatever numbers you want to see what matters mainly and go from there.

 

[alpha0815]

Awesome, thanks!

 

[hkguns]

As was pointed out below this was way wrong.

 

[NevadaZielmeister]

Just trying to get a general idea here. Does anyone have a table or data for 175gr SMK loads? Preferably factory loads. Found quite a bit of data out there for the FGMM 168 SMK from a 20" barrel, but nothing really for the 175.

Thanks in advance.

Forget all of the "free" stuff on the internet. It will not be very helpful and when you go out to shoot past 300 yards, your data will not correlate. However, if you use this Field Density Altitude Compensator (FDAC) 308 175gr METERS it will.

This data card system I used for the 168 grain but it was much better for the 175 grain. I also now use it for my 155 grain Lapua Scenars. It is within .1 mil-radian accurate. You can also find the Field Density Altitude Compensator (or "FDAC") in yards.

Good luck and let me know if you went with this system and whether you need any further help.

 

[sandwarrior]

hkguns,

I don't know where you got that chart, but I can tell you it takes a lot more than 30 moa to reach 1k with a 175 SMK @ 2550. In my experience it's about 36 moa and 34.5 moa up at 4k DA.

 

[Gunfighter14e2]

22" Pac-Nor leaving at 2660 takes 37 iphy (35.3moa)to get to POA at 1K.
My 20" 700aac is 72fps slower at the muzzle(same load) an takes 39.5 iphy (37.7moa) to do the same.
Hope this helps,...

 

[Tempest 455]

hkguns,

I don't know where you got that chart, but I can tell you it takes a lot more than 30 moa to reach 1k with a 175 SMK @ 2550. In my experience it's about 36 moa and 34.5 moa up at 4k DA.

Ditto that.

 

[hkguns]

hkguns,

I don't know where you got that chart, but I can tell you it takes a lot more than 30 moa to reach 1k with a 175 SMK @ 2550. In my experience it's about 36 moa and 34.5 moa up at 4k DA.

It came directly off Zdziarski's ballistic program. I'll have to see if I have something setup incorrectly.

Edit: I may have found the issue. If you notice the data above uses the G7 model which is appropriate for that bullet. If I change it to G1 the 1000 yard numbers vary a lot more than one would expect.

There may be a G7 drag model bug in the latest version of his software.

 

[hkguns]

Here OP, this should be accurate for the 16.5" barrel I used in the software.

I used G1 drag model and a factory load. You can ignore the reload data in the upper portion, it is just a leftover.






<center>[h=1]Input Parameters[/h][h=2].308 Black Hills 175gr Sierra MatchKing HPBT Moly[/h]

Powder Type:	IMR 4064
Powder Weight:	43.3 gr
Primer Type:	CCI Large Rifle
Brass Make:	Hornady Match
C.O.L.:	2.80
Rifle:	HK MR762
Barrel Length:	16.5"
Shot Group:
Notes:
TKO:	20.02
OGW / Muzzle:	807.4 lb
OGW / Zero:	647.7 lb
IPSC PF:	455.00

<tbody>
</tbody>

BC	Bullet Weight	Muzzle Velocity	Zero Range	Sight Height	LOS Angle
0.496 G1	175gr	2600	100	3.0 in	0°
Altitude	Pressure	Temp	RH	Wind Velocity	Wind Angle
794.0	30.13 Hg.	20.8 °F	54%	-	-
Zero Altitude	Zero Pressure	Zero Temp	Zero RH	Max PBR Zero
0.0	29.92 Hg.	59.0 °F	0%	261
Miller Stability	1.53

<tbody>
</tbody>

[h=1]Bullet Trajectory[/h]

Range (yards)	Drop (in)	Drop (iphy)	Wind. (in)	Wind. (iphy)	Veloc. (fps)	Energy (ft-lbs)	Time (sec)
0	<big>↓</big>	-3.02	0.00	0.00	0.00	2606	2639	0.00
50		-0.82	-1.64	0.02	0.05	2510	2448	0.06
100	<center>⊕</center>	-0.01	-0.01	0.09	0.09	2416	2268	0.12
150		-0.70	-0.46	0.20	0.13	2324	2098	0.18
200		-3.01	-1.50	0.36	0.18	2233	1938	0.25
214	<big>↑</big>	-4.03	-1.88	0.41	0.19	2209	1892	0.27
250		-7.07	-2.83	0.56	0.22	2145	1788	0.32
300		-13.04	-4.35	0.81	0.27	2059	1647	0.39
350		-21.07	-6.02	1.12	0.32	1975	1515	0.46
400		-31.34	-7.84	1.49	0.37	1892	1391	0.54
450		-44.07	-9.79	1.93	0.43	1812	1276	0.62
500		-59.45	-11.89	2.43	0.49	1734	1169	0.71
550		-77.75	-14.14	3.02	0.55	1659	1069	0.79
600		-99.23	-16.54	3.69	0.61	1586	977	0.89
650		-124.19	-19.11	4.45	0.68	1516	893	0.98
700		-152.96	-21.85	5.31	0.76	1449	815	1.09
750		-185.91	-24.79	6.28	0.84	1385	745	1.19
800		-223.42	-27.93	7.38	0.92	1324	681	1.30
850		-265.92	-31.29	8.60	1.01	1267	624	1.42
900		-313.88	-34.88	9.97	1.11	1215	573	1.54
950		-367.77	-38.71	11.48	1.21	1166	529	1.66
1000		-428.10	-42.81	13.15	1.32	1123	490	1.80
Range	Drop	Drop	Wind.	Wind.	Veloc.	Energy	Time

<tbody>
</tbody>

</center>

 

[sandwarrior]

HKguns,

That looks a lot more like it. I may have gotten my 36 moa due the high scope over bore center. I calculated using JBM and more standard measurements and 2550 and came up with 42 moa as well. I also shoot here at 2200 or 2500. Usually on warmer days.

 

[shotdown]

Here was my data with a Rem SPS TAC 20" barrel using 175 gr SMKs. Not Factory loads but the data may help. It's in mils.

Winchester Brass
Federal 210M Primers
Varget @ 44.2 gr
OAL: 2.810

 

[Chanonry]

Forget all of the "free" stuff on the internet. It will not be very helpful and when you go out to shoot past 300 yards, your data will not correlate.

Bollocks

 

[VTSEAL]

HKguns, Why did you go with the G1 drag model? I do realize that Sierra lists only the G1 BC's on their website (as does Federal on their shamefully awful website), but the design of the SMK is a much more similar profile to the G7 bullet, and should be more accurately represented by using the the G7 drag model calculations. You might get more accurate long range calculations using the .243 G7 BC (Litz observed) that Brian Litz has published. The observed G7 BC's are also less variable than the G1 across a range of likely muzzle velocities, which may help minimize variances in your actual MV and the MV of the OP.

 

[hkguns]

.308 Sierra MatchKing 175gr ballistic data/card

HKguns, Why did you go with the G1 drag model? I do realize that Sierra lists only the G1 BC's on their website (as does Federal on their shamefully awful website), but the design of the SMK is a much more similar profile to the G7 bullet, and should be more accurately represented by using the the G7 drag model calculations. You might get more accurate long range calculations using the .243 G7 BC (Litz observed) that Brian Litz has published. The observed G7 BC's are also less variable than the G1 across a range of likely muzzle velocities, which may help minimize variances in your actual MV and the MV of the OP.

Because the G7 drag model data I posted above was way wrong. There appears to be a bug in the G7 data in the ballistic software.

 

[sandwarrior]

Bollocks

Bollocks as not true? Or, Bollocks as "damn I put all my eggs in one basket again?"

 

[alpha0815]

Thanks for all the info guys. I still have a lot to learn and plan on using this as a baseline to compare to, once I can finally make it out to the long range and get some actual data from my own setup.

 

[JEG]

One of my buddies is using factory FGMM 175gr and he's getting approximately 2550 fps out of a 20" barrel.

 

[CXO]

I just ran one round of FGMM the other day.

Rem 5R 24" barrel 11.25 twist.
FGMM 175 SMK
Temp 68F ALSTG 30.15
Pro Chrono set at 8 feet

Velocity = 2594 FPS.

Just guessing, but you'll probably wind up with about 2500 fps out of a 20" barrel.

 

[Slug-O]

Good info guys.. And for me it's 42.5MOA at 1K