Rifle Scopes 90 MOA Elevation, Different barrel lengths are giving me different amouts of moa

[agbm]

Guys I really have something strange going on and I do not understand it, maybe I'm missing something. I have two rifles Both rifle are Rem 700 .308 caliber and both have 20MOA Badger Ordnance bases on them. Rifle #1 has a 20" barrel and Rifle #2 has a 26" barrel. When I zero both rifles at 100 yards using the same ammo, rifle #1 with the 20" barreled rifle gives me about 54MOA and Rifle #2 with the 26" barrel gives me about 70MOA. My question is does the barrel length affect your available MOA when it comes down to barrel length?

Thanks
AGBM

 

[Rob01]

How much windage are you using to zero with #1?

 

[agbm]

Dead center on windage

How much windage are you using to zero with #1?

 

[agbm]

Dead center on windage

Dead center on windage

 

[mjh30]

Rear bridge height on the Remingtons can differ, whats the serial number range for the rifles?

 

[Gunfighter14e2]

One Barrel could be clocked at 1200 vs 1800 for the other.

 

[agbm]

G7050920 range for 26:
G7154590 range for 20"

Rear bridge height on the Remingtons can differ, whats the serial number range for the rifles?

 

[mjh30]

agbm, there was a difference in the rear bridge between older and newer Remington, but in your case this is not the cause of the problem. Are you sure the two badger bases are both 20moa, is it possible one is not?

 

[flounderv2]

Bridge height
Scope height above bore
Ring height
Base MOA differences
Barrel timing.
Scope type
Ammo velocity (although shouldnt be huge at 100)

 

[agbm]

agbm, there was a difference in the rear bridge between older and newer Remington, but in your case this is not the cause of the problem. Are you sure the two badger bases are both 20moa, is it possible one is not?

Both bases say Badger Ordance 1005 - 306- 06 and look the same, should be Rem 700 SA 20MOA Bases. Also the 26" is a Rem 700 Police model and the 20" is a Rem 7000 AAC-SD. I'm wondering was there anything done special to the police models?

 

[agbm]

Bridge:?
Scope height: 1.5
Ring height: Low 1.0"
Base moa: both 20 MOA bases
Barrel timing: ?
Scope: Leupold MK4 8.50 - 25 X50mm tied into a Barrett BORS System
Ammo: 175 FGMM 1-12 twist 20" 2510 1-10 twist 26" 2650

Bridge height
Scope height above bore
Ring height
Base MOA differences
Barrel timing.
Scope type
Ammo velocity (although shouldnt be huge at 100)

 

[buffybuster]

The difference in available travel could be of slightly differing rear bridge heights and the barrel not being clocked TDC.

Remington doesn't keep a real tight spec on the rear bridge height and they don't spend any time clocking their barrels.

Barrel clocking: the bore in rarely straight, so the best case is for the barrel to point up.

Regardless, you have over 50moa available which will get you farther than you should shoot a .308win.

 

[agbm]

The difference in available travel could be of slightly differing rear bridge heights and the barrel not being clocked TDC.

Remington doesn't keep a real tight spec on the rear bridge height and they don't spend any time clocking their barrels.

Barrel clocking: the bore in rarely straight, so the best case is for the barrel to point up.

Regardless, you have over 50moa available which will get you farther than you should shoot a .308win.

Ok, how would I measure bridge height on both actions with bases mounted? Also is there any way for me to check barrel timing /barrel clocking or can that only be done by a gunsmith? I think every one is saying that if the two rifles are the same except for the barrel length the moa should be the same when zeroing at 100 yards. I used a Bushnell Bore Sighter with arbors to check.

 

[Redmanss]

The difference in available travel could be of slightly differing rear bridge heights and the barrel not being clocked TDC.

Remington doesn't keep a real tight spec on the rear bridge height and they don't spend any time clocking their barrels.

Barrel clocking: the bore in rarely straight, so the best case is for the barrel to point up.

Regardless, you have over 50moa available which will get you farther than you should shoot a .308win.

Best conclusion yet on this.

OP, I understand it can be a bit frustrating, but you're working with stock R700s here. They're well known to have loose specs on their receivers, but they still get the job done for most purposes. You may check #1 again to see if you need to bed your base at the rear of the receiver to regain your "lost" elevation, but if you're able to use your system to the max effectiveness of it, you're not missing out on anything.

Shoot them, have fun, and when they start losing their accuracy get them trued and a premium cut rifled barrel screwed on them. Don't sweat the numbers so much until then.