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#6528336 - 11/05/16 07:26 PM Did some MPBR testing today, and with a .270
FiremanJG Offline
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Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
FD brother brought out a Savage .270 that he reports typically shoots very small. He had to zero a brand new Vortex scope at 100. Two types of ammo, and Barnes did very well. Long story short he wanted to zero 1 1/2" high at 100. I helped glass for him, to get him there. Once we settled on the ammo producing consistent shooting, I asked if he wanted a 200 yard zero. He said yes, and that should be a 200 yard zero. I said OK, you want to try and hit the plate at 200? Sure he says.

He held elevation center, and I told him what wind to hold with his duplex reticle. First shot did hit, at 6 o'clock, barely on the plate (4" square). I told him to bring up his elevation 1 MOA, and let's try again. Next shot was about 1/2 MOA high, but he said he could live with it.

I said, you want to try 300? Sure, he says. Then he said, it should be about 4" low, at 300. So I told him the plate was a 6", and if he held on the top edge of it, he would almost have that 4" correction. Then I said, "find where that would be on the reticle, not on the target". He understood, and figured halfway down from center to the post would get it done. First shot was elevation perfect, left wind error, but still on the plate.

So, quickly it was determined that the 100 yard zero was not in fact perfectly set up for a 200 yard zero, and not a no elevation hold for 300. And effectively we zeroed the scope for 200 yards. The 300 yard shot, had it been held center would have missed low, by 6". He held an elevation, and wind correction to get elevation to be correct. We did not retest the ammo, back at 100 yards, unfortunately. But, if the scope/rifle/ ammo were behaving consistently then his 100 yard zero would have been 2 1/2" high.
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#6528486 - 11/05/16 10:16 PM Re: Did some MPBR testing today, and with a .270 [Re: FiremanJG]
spg Offline
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Registered: 08/11/13
Posts: 905
I concur however, I'm not much on MPBR but some of the guys that come through the shop talk alot about sighting in 1'' or whatever high at 100 to be able to hold center mass and hit at 300. I usually refrain from elaborating, tried it before and had to demonstrate to prove the point.

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#6528666 - 11/06/16 07:07 AM Re: Did some MPBR testing today, and with a .270 [Re: spg]
FiremanJG Offline
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Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
1" high at 100 would have been a significantly low miss at 300. 1 1/2" high at 100 was almost a miss at 200. Course everyone has a half MOA rifle, and we were shooting 2 MOA steel, which is considered smaller than whitetail vitals.
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#6528716 - 11/06/16 08:14 AM Re: Did some MPBR testing today, and with a .270 [Re: FiremanJG]
charlesb Offline
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Registered: 04/07/10
Posts: 1408
Loc: West Texas mountains
Apparently not many understand the MPBR concept.

There's more to it than simply sighting in an inch or inch and a half high, no matter what you are shooting.

What is Maximum Point-Blank Range Hunting?

Rifle Trajectory Table

This information will be educational for most, but not all. There is a famous quote about that:

"I can explain it for you, but I cannot comprehend it for you."

Properly understood and implemented, MPBR is an excellent tool for hunters everywhere.
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#6528797 - 11/06/16 09:29 AM Re: Did some MPBR testing today, and with a .270 [Re: charlesb]
FiremanJG Offline
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Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
Originally Posted By: charlesb
Apparently not many understand the MPBR concept.

There's more to it than simply sighting in an inch or inch and a half high, no matter what you are shooting.


Which is exactly why we then shot it at 200, then 300 yards. confused2
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#6528846 - 11/06/16 10:09 AM Re: Did some MPBR testing today, and with a .270 [Re: FiremanJG]
watchale Offline
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Registered: 02/18/10
Posts: 1805
Loc: Tx
So did y'all find his mpbr?
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#6529200 - 11/06/16 03:18 PM Re: Did some MPBR testing today, and with a .270 [Re: FiremanJG]
Jgraider Online   content
Bird Dog

Registered: 06/13/15
Posts: 267
Loc: West Texas
Originally Posted By: FiremanJG
1" high at 100 would have been a significantly low miss at 300. 1 1/2" high at 100 was almost a miss at 200. Course everyone has a half MOA rifle, and we were shooting 2 MOA steel, which is considered smaller than whitetail vitals.


What was the muzzle velocity and ammo, out of curiosity?


Edited by Jgraider (11/06/16 03:19 PM)

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#6529262 - 11/06/16 03:44 PM Re: Did some MPBR testing today, and with a .270 [Re: watchale]
FiremanJG Offline
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Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
Originally Posted By: watchale
So did y'all find his mpbr?


Well that depends on target size. He could've hit a house door without making a hold for elevation.
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#6529266 - 11/06/16 03:45 PM Re: Did some MPBR testing today, and with a .270 [Re: Jgraider]
FiremanJG Offline
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Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
Originally Posted By: Jgraider
Originally Posted By: FiremanJG
1" high at 100 would have been a significantly low miss at 300. 1 1/2" high at 100 was almost a miss at 200. Course everyone has a half MOA rifle, and we were shooting 2 MOA steel, which is considered smaller than whitetail vitals.


What was the muzzle velocity and ammo, out of curiosity?


Didn't have the good chronograph on location. Barnes factory ammo. Pretty cool seeing those shiny copper impacts on steel through the spotting scope.
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#6529277 - 11/06/16 03:48 PM Re: Did some MPBR testing today, and with a .270 [Re: FiremanJG]
Jgraider Online   content
Bird Dog

Registered: 06/13/15
Posts: 267
Loc: West Texas
Ok. 2.5" @ 100 would have been about where I started if it were me, with typical 130gr .270 ammo.

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#6529374 - 11/06/16 04:33 PM Re: Did some MPBR testing today, and with a .270 [Re: FiremanJG]
charlesb Offline
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Registered: 04/07/10
Posts: 1408
Loc: West Texas mountains
Originally Posted By: FiremanJG
Originally Posted By: watchale
So did y'all find his mpbr?


Well that depends on target size. He could've hit a house door without making a hold for elevation.


In other words, you have no clue as to the meaning of MPBR - but you feel qualified to criticize it anyway.


Edited by charlesb (11/06/16 04:37 PM)
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#6529375 - 11/06/16 04:33 PM Re: Did some MPBR testing today, and with a .270 [Re: FiremanJG]
spg Offline
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Registered: 08/11/13
Posts: 905
This could get out of hand

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#6529383 - 11/06/16 04:38 PM Re: Did some MPBR testing today, and with a .270 [Re: FiremanJG]
charlesb Offline
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Registered: 04/07/10
Posts: 1408
Loc: West Texas mountains
- Or a few hunters here could learn something useful.


Edited by charlesb (11/06/16 04:39 PM)
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#6529420 - 11/06/16 05:00 PM Re: Did some MPBR testing today, and with a .270 [Re: FiremanJG]
watchale Offline
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Registered: 02/18/10
Posts: 1805
Loc: Tx
Originally Posted By: FiremanJG
Originally Posted By: watchale
So did y'all find his mpbr?


Well that depends on target size. He could've hit a house door without making a hold for elevation.


So you didn't help him find a good mpbr? Like how far he could shoot without going over 3" high and 3" low out to a certain distance ?
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#6529425 - 11/06/16 05:03 PM Re: Did some MPBR testing today, and with a .270 [Re: FiremanJG]
Dalee7892 Online   content
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Registered: 05/04/15
Posts: 1002
Loc: Denton County
Here we go again.

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