Range Report 18" barrel and chrono numbers *Final test*

[Hateca]

Here is an update from this post http://www.snipershide.com/forum/ubbthre...497#Post1170497

Went to the range today to get chrono numbers out of the 18” barrel. I used only factory ammo, Federal 168 match, and BH 175 match. I didn’t really set out to shoot groups, set out just get numbers so I wasn’t really trying real hard and I didn’t take the camera with me. But posted is two five shot groups with Federal that I scanned just for giggles.

Mounted one of my USO’s on the rifle. Total weight as you see it is 14 lbs. Rifle feeds like a champ with the AW mag.

Fired 15 rounds of Federal and 10 of BH. The groups in the pic are Federal. I have never had good luck with BH and I don’t normally use it. Today was no exception, the 10 shots I took were over an inch for five shots. It could be just the lot of ammo but like I said never had any luck with it in any rifle so take it for what it’s worth. I took the BH with the 175 bullet today just for the chrono numbers.

The chrono was 10 feet from the muzzle.

Conditions: Temp 78, Pressure 29, Humidity 44%, Wind calm, Elevation 2500’.

Average for Federal 168 for 10 shots was 2622.0 FPS

Average for BH 175 for 10 shots was 2537.9 FPS

 

[Dsparil]

Re: 18" barrel and chrono numbers

2,600 fps should be significant for 900 yards right? how did the FGMM 175 work out? had a chance to shoot that?

 

[Hateca]

Re: 18" barrel and chrono numbers

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Dsparil</div><div class="ubbcode-body">2,600 fps should be significant for 900 yards right? how did the FGMM 175 work out? had a chance to shoot that? </div></div>

Had no Federal 175 to test, but it would be dang near the same as the BH.

The velocity could get you to 1000 but the rifle is not built for that. 800 to 900 is very doable and more realistic. You also have to remember this is factory ammo, re-loading is another story, so pushing the rifle to the edge is always possible but I don't set out to build a working rifle to work with just re-loads, I want the rifle to do it with factory ammo. If it can do it with factory then the re-loading is a cake walk.

 

[Luvman]

Re: 18" barrel and chrono numbers

your test rifle MINUS the surefire brake is spot one for what for me would be the perfect all around .308. a threaded muzzle with a protector would suffice for me. the fact that it accepts AW mags just sweetens the deal.

I'd have a hard time choosing a stock. the A5, T2, T3, and the T4 all appeal to me.

 

[Graham]

Re: 18" barrel and chrono numbers

Any plans to try it with Lapua 170gr Lock-base HPS factory ammo?
The BC is .533 and it is spec'd to deliver 2840 out of 24" BBL, so it should do 2750fps, easy, and there's your 1K rifle.

 

[Hateca]

Re: 18" barrel and chrono numbers

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Graham</div><div class="ubbcode-body">Any plans to try it with Lapua 170gr Lock-base HPS factory ammo?
The BC is .533 and it is spec'd to deliver 2840 out of 24" BBL, so it should do 2750fps, easy, and there's your 1K rifle. </div></div>

If you want to send me box I will be happy to check for you

 

[LoneWolfUSMC]

Re: 18" barrel and chrono numbers

That's sweet. I think I have decided to go with a 18" barrel on my AR10.

 

[Slickrick0999]

Re: 18" barrel and chrono numbers

I got a buddy running a 16" AR10. Lots of fun to shoot. It is set up CAR4 style.

 

[coldbeerchief]

Re: 18" barrel and chrono numbers

Those are some good numbers with factory ammo.

Any experience with 16" barrels in 1:10 ?? (bolt guns)

 

[Emilio]

Re: 18" barrel and chrono numbers

Randy, any idea when you would start taking on builds like that?

 

[Dsparil]

Re: 18" barrel and chrono numbers

my rifle has a 22" inch barrel on it and im thinking of chopping 4" for a nice 800 yard urban rifle.

 

[knifecoop]

Re: 18" barrel and chrono numbers

Considering an 18 inch barrel for my AR10 build. Randy are you accepting any local coating work on AR builds?
Thanks
KC

 

[Graham]

Re: 18" barrel and chrono numbers

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: HateCA</div><div class="ubbcode-body">If you want to send me box I will be happy to check for you

</div></div>LOL! Thanks Randy, but Moon already built me one just like that, in an AICS. I'll let YOU know when I finally get around to chrono'ing it.

 

[birddog28]

Re: 18" barrel and chrono numbers

Building a nice stick like that and not shooting tuned handloads is like putting 87 octain in a porche!

I used to have a 18" 700P barreled action that was getting aroung 2750 with 168 handloads according to the JBM ballistic calculator....never shot it over the chrono though.

 

[Turk]

Re: 18" barrel and chrono numbers

Building a nice stick like that and not shooting tuned handloads is like putting 87 octain in a porche!

Damn it Birddog; I said paint the "Porch" not the......!

 

[Strangedays]

Re: 18" barrel and chrono numbers

I get around 2640 with my dpms LR308 with the 18 BB fluted and CRYO accurized. Shooting the factory Federal 168 SMK. Love the gun and love the groups.

 

[Graham]

Re: 18" barrel and chrono numbers

Chrono'd today:

18.5" Bartlein
Lapua HPS 170gr Lock Base
2630fps at 60 degrees, a few hundred feet above sea level.

Under today's conditions, that would be 10.5 Mils elevation and 1285fps at 1000 yards.

 

[Graham]

Re: 18" barrel and chrono numbers

Randy, what (if any) is your experience with 155 Scenars in that barrel?

I ask because I am thinking of trying a Scenar load with a faster burning powder, like H322, to get to 2700fps and keep the equivalent BC of the 175SMK.

 

[Lumpy Grits]

Re: 18" barrel and chrono numbers

HI all, FYI as per Randy's other post, he will be OFF the grid for a bit
Respectfully,
LG

 

[Graham]

Re: 18" barrel and chrono numbers

I wish him luck with his minor tune-up! Get better Randy, we need you on here to help us figure things out.

 

[Hateca]

Re: 18" barrel and chrono numbers

Have not tried any Scenars.

After a spell with some hospital visits I was able to get out and do the final test for the info I was looking for.

The final test was with 155 Match Palma bullets with 44 grains of RE-15, federal brass, Win primers.

The chrono was 10 feet from the muzzle.

Conditions: Temp 82, Pressure 29, Humidity 17%, Wind calm, Elevation 2500’.

Average for Federal 155 Palma for 10 shots was 2810.0 FPS

 

[J.Boyette]

Re: 18" barrel and chrono numbers

When I cut my 22" down to 18" I want to go with 190 SMK's with LR Mag primers and some RE-15 just for the hell of it.

I think that would be a great bullet for such a build.

John

 

[Dsparil]

Re: 18" barrel and chrono numbers

when I chop mine to 18" I want to be able to hit 800 yards with 168s. 11.27 twist mike rock 5r barrel.

 

[Switchblade]

Re: 18" barrel and chrono numbers

I'm happy with 600M for an 18" barrel, as I have two sticks that will stretch to 1k, even three if I count my match grade M14, but I ain't going to be the one hitting out to 1k with irons on it unless I get real lucky(glasses and all that)

 

[ckirkc]

Re: 18" barrel and chrono numbers

im also at an avg 2810 with 155 scenars out of my 18" rock.