DPMS SASS FGMM velocity very low...

[KYpatriot]

I just shot four 5 round strings through the SASS...and the FGMM 168s averaged 2458 and the 175s only 2405.

Doesnt that seem pretty slow, even for an 18 inch barrel?

Shot some of my reloads intended for the bolt gun as well, these are 45grains Varget and 175SMKs in FGMM brass...these were 2550. They showed some slight ejector swipe so they look a touch hot for the SASS.

Any reason the SASS would have such low velocities? I expected more like 2500 or a little over for the 175s.

 

[deerassassin22]

Re: DPMS SASS FGMM velocity very low...

I have a SCAR 17 with a 16.25 Barrel and I'm getting the following measure 10feet from muzzle. The second set of data is taken from my chrono at target 100yards downrange I will use DR: so everyone understands. The chart flows Bullet, Powder, COAL, Grns of Powder, FLR MG: Federal Large Rifle Match Grade, Each bullets speed first, Avg Velocity, Extreme Spread, Standard Deviation. All Hornady Match Brass Trimmed 2.005, Flash hole cleaned, primer uniformed and cleaned, chamferd and debured. The Z-max is the factory Zombie ammo from Hornady.


1. 168gr BTHP Match Hornady Powder:H489 COAL: 2.79O Grn: 42.5 FLR MG 2406 2359 2372 Avg: 2379 ES: 47 SD:24
DR: 168gr BTHP Match Hornady H4895 2.790 42.5 FLR MG 2256 2244 2244 Avg: 2248 ES: 12 SD: 6

1. 168gr Z-MAX BULLET UNK 2.80O 2455 2460 2450 Avg:2455 ES:10 SD:5
DR: 168gr Z-MAX BULLET UNK 2.80O 2271 2310 2402 Avg: 2327 ES:131 SD:67

1. 168gr BTHP Match Hornady Reloader 15 2.80 45 FLR MG 2419 2428 2437 2428 2428 Avg:2428 ES:18 SD:6
DR: 168gr BTHP Match Hornady Reloader 15 2.80 45 FLR MG 2214 2214 2192 2237 2237 Avg: 2218 ES:45 SD:18

 

[BCP]

Re: DPMS SASS FGMM velocity very low...

Same numbers my DPMS SASS had.

If you want it to go faster 2000MR is the answer.

Also mine shot well with 208 AMAX.

 

[KYpatriot]

Re: DPMS SASS FGMM velocity very low...

Ok thanks. Just thought it seemed low. Appreciate the data.

 

[CajunAR]

Re: DPMS SASS FGMM velocity very low...

Yeah i ran into the same thing with mine (10 shot ave of 2439 iirc). I went to my first F-class shoot not knowing it was that low and had all my numbers for about 2550. Needless to say it didn't work out so well for me.

I promptly bought a chrono and have now got handloads seemingly as accurate with more M/V and will be using those at the next shoot i can make it to.

 

[REL1203]

Re: DPMS SASS FGMM velocity very low...

My DPMS SASS shoots right around the same, that just let me know my handloads sweet spot is right around 2400-2450, which coincidently is right around the area my test resulted in the best accuracy.

 

[Justinsaneok]

Re: DPMS SASS FGMM velocity very low...

LR 308 16" AP4 shooting LC M80 ball 147gr 10' from crono
2650fps avg
max deviation 50 fps
For what it's worth.