Texas Hunting Forum

Omega owners - poi shift ?

Posted By: Brother in-law

Omega owners - poi shift ? - 03/24/16 08:40 PM

How much change do you average using the omega?

Bolt gun?
AR?
Posted By: ChadTRG42

Re: Omega owners - poi shift ? - 03/24/16 08:54 PM

They will have a varying shift, depending on the barrel, barrel length, barrel thickness, and bedding. For your rifle, though, it will be a repeatable shift and can be corrected for.
Posted By: BigPig

Re: Omega owners - poi shift ? - 03/24/16 08:58 PM

It won't help you shoot any better bolt
Posted By: QuitShootinYoungBucks

Re: Omega owners - poi shift ? - 03/24/16 09:35 PM

Honestly I've never shot my 6.8 w/o it, so I don't really know. However, there is a possibility that the first shot and all subsequent shots in a string are not hitting the same spot. Here are two different 100yd 5 shot groups:

High shot, then four together (6.8 SPC, Fed Fusion 115gr.) 16" RRA with ASR Brake and Omega
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Low shot, then four together (5.56, Hornady .223 55gr Varmint Express) 18" RRA with ASR Flash Hider and Omega
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Posted By: Brother in-law

Re: Omega owners - poi shift ? - 03/24/16 11:23 PM

Originally Posted By: BigPig
It won't help you shoot any better bolt


True but even if I get one you will still need the 10 point bonus stage to beat me cheers
Posted By: BigPig

Re: Omega owners - poi shift ? - 03/25/16 01:17 AM

I only got 6 on that stage. Some people cleaned the prairie dogs loser8
Posted By: Brother in-law

Re: Omega owners - poi shift ? - 03/25/16 01:20 AM

Blind hog finds an acorn every now and then
Posted By: J.G.

Re: Omega owners - poi shift ? - 03/25/16 01:30 AM

You'll learn what the rifle does in no time. You can zero the scope to the cold bore shot, for hunting purposes, or you can zero to where it starts to group like QuitShootinYoungBucks pointed out.

My 7-08 is zeroed to the cold bore, but subsequent shots will be .3 MIL low. But I know that, so it's not a problem.
Posted By: Brother in-law

Re: Omega owners - poi shift ? - 03/25/16 02:15 AM

Have a birthday coming up and I'm pitching ideas
Posted By: J.G.

Re: Omega owners - poi shift ? - 03/25/16 02:21 AM

Once you hunt suppressed, you'll (almost) never hunt with an unsupressed rifle ever again.
Posted By: BigPig

Re: Omega owners - poi shift ? - 03/25/16 02:24 AM

Originally Posted By: FiremanJG
You'll learn what the rifle does in no time. You can zero the scope to the cold bore shot, for hunting purposes, or you can zero to where it starts to group like QuitShootinYoungBucks pointed out.

My 7-08 is zeroed to the cold bore, but subsequent shots will be .3 MIL low. But I know that, so it's not a problem.


Do you see a similar POI change from cold bore to subsequent shots without the suppressor?
Posted By: J.G.

Re: Omega owners - poi shift ? - 03/25/16 02:39 AM

Nope.

My educated theory is as the barrel heats up it becomes more flexible. More flexible means more sine wave on the muzzle causing it to open up the consistentcy.

But my suppressor is 10" and 26 oz. So that makes the opening up more pronounced. Cut the weight down to 16 oz. on a non-magnum rated suppressor, and it would shoot more consistently cold bore to warm barrel.
Posted By: Brother in-law

Re: Omega owners - poi shift ? - 03/25/16 02:40 AM

I doubt it unless I build more rifles. I can't stand long rifles, they are not practical for 90% of my styles.
I'm thinking of building a stubby soon , I just don't know what caliber yet.
Posted By: J.G.

Re: Omega owners - poi shift ? - 03/25/16 02:41 AM

The 7 Rem Mag was load developed without suppressor, and it'll shoot perfect center all the way out to 800, at will. Add the suppressor and it goes to poop. 26" "lighter" barrel than all the other rifles.
Posted By: J.G.

Re: Omega owners - poi shift ? - 03/25/16 02:42 AM

Originally Posted By: Brother in-law
I doubt it unless I build more rifles. I can't stand long rifles, they are not practical for 90% of my styles.
I'm thinking of building a stubby soon , I just don't know what caliber yet.


One of the calibers you already have...
Posted By: Brother in-law

Re: Omega owners - poi shift ? - 03/25/16 02:45 AM

I might do a short 223,308., or 6.5
Posted By: J.G.

Re: Omega owners - poi shift ? - 03/25/16 03:12 AM

1:8 twist 223 loaded with 75 gr A-maxes would be pretty cool. All the brass and bullets you could ask for.

:edit: I'm pretty impressed with my .308 loaded with 155 gr Tipped Match Kings. I'm getting 2600 fps MV out of a 16" AR. You'd get more velocity than that with the bolt action. By some miracle that 155 gr .30 cal has a BC of .519. Higher than a 175 SMK, and higher than a 178 A-Max.
Posted By: Brother in-law

Re: Omega owners - poi shift ? - 03/25/16 03:18 AM

Just need some money
Posted By: J.G.

Re: Omega owners - poi shift ? - 03/25/16 03:34 AM

Don't we all...
Posted By: slayer12

Re: Omega owners - poi shift ? - 03/25/16 01:11 PM

My 6.5 CM has a 3" vertical shift low. But like stated earlier its always the same.
Posted By: caddokiller

Re: Omega owners - poi shift ? - 03/27/16 02:08 AM

My 300 win mag with a MTU contour 28 inch barrel has virtually not shift. My buddies light weight 260 have almost a 6in shift.
Posted By: Generalzip

Re: Omega owners - poi shift ? - 03/28/16 12:35 AM

Originally Posted By: FiremanJG
1:8 twist 223 loaded with 75 gr A-maxes would be pretty cool. All the brass and bullets you could ask for.

:edit: I'm pretty impressed with my .308 loaded with 155 gr Tipped Match Kings. I'm getting 2600 fps MV out of a 16" AR. You'd get more velocity than that with the bolt action. By some miracle that 155 gr .30 cal has a BC of .519. Higher than a 175 SMK, and higher than a 178 A-Max.


I wouldn't trust that BC if I were you. In my experience the actual BC through testing is quite a bit lower. The BC of the tipped match king should be quite close to that of the Amax in the same weight. Very similar bullet design.
Posted By: J.G.

Re: Omega owners - poi shift ? - 03/28/16 12:36 AM

Well, I confirmed it from 200 to 800 yards...
Posted By: DStroud

Re: Omega owners - poi shift ? - 03/28/16 01:19 AM

I have used the BC published by Sierra on the 175gr MKT and found it money to 1000 yards.
Posted By: JTPinTX

Re: Omega owners - poi shift ? - 03/28/16 01:44 PM

POI shift when I put the Omega on my 6.5 creedmoore was .3 MIL at 100. But it is very repeatable.
Posted By: ccreyeder

Re: Omega owners - poi shift ? - 03/31/16 04:17 PM

+1 on it depending on your rifle/ammo set up.

I have 2 ARs, both 16", one in 6.8 and one in 300 bo... on those rifles adding the omega moves my POI about 2" down. I have a Tikka with a 20'' barrel in .308 and POI shift is negligible.
Posted By: Matt

Re: Omega owners - poi shift ? - 03/31/16 05:40 PM

I just recently picked my Omega up and just got to shoot it last weekend.
My gunsmith buddies tell me how the threads are cut make the biggest difference on POI shift.
My other can is a Thompson Machine 30 and is 8.5" long, weighs 26oz and is direct thread.
The Omega is 6.5"ish (not counting the break) and 16oz with the ASR connection. All Omega shots are using an ASR break.
Here are the differences in POI shift. All zero'd a 100 yards. All shifts were measured at 100 yards.

Remington 700 AAC .308 20" barrel 1-10 twist, factory threaded, in a B&C Medalist stock. Using factory 168gr Amax.
With the Thompson, the shift is 2" left and 6" down
With the Omega, the shift is 2.5" left and 2" down

Remington 700, 6.5 Creedmoor, 24" Shilen barrel 1-8 twist #7 taper, in an AIAX chassis. Using factory 140gr Amax.
With the Thompson, the shift was 1" left
Whith the Omega, no POI shift

Remington 700, 6.5 Creedmoor, 18.5" Hawk Hill barrle 1-8 twist .88 taper at muzzle, in a MagPul hunter stock. Using factory 140gr Amax.
With the Thompson. The POI shift was 1" left and .5" down
With the Omega, The POI shift is .5" up

LWRC M6A1, 5.56, 16" 1-7 twist with free float Sampson 15" rail. Using XM193 55gr ball.
With the Thompson, the POI shift is 4" left and 4" down
With the Omega, the POI shift is 1.5" right

I hope this helps.
Thanks!!
Matt
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