Max range with 56mm scope on 20 moa rail + ?moa mount?

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FromMyColdDeadHand

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#1
My son wants to get into longer range shooting. He has a Ruger RPR in 6.5Creed. For his birthday I wanted to get him one of the 35x scopes with a 56mm bell. The RPR has a 20 MOA rail, and I’m looking at either a Leupold Leupold Mark 5HD 5-25×56 with the PR2MIL reticle, or the Vortex Vortex Razor HD GEN III 6-36X56 with the ERB7d reticle. If he likes shooting long range, he is thinking about getting a rifle in a more dedicated long range caliber.

With the 6.5C, how far could he shoot with a 0MOA mount?
How far with a 20MOA mount?
How high of a mount to clear the RPR rail?
What about the ERTAC 25-45MIL variable scope mount?
DO any of these preclude using a 100 yard zero?

Thanks
 
#2
6.5C needs about 30MOA scope adjustment to get to 1000yds and 50MOA for 1300yds.

The Razor has about 120MOA of adjustment, half in the direction you need.

Even without the extra 20MOA in the rail he will be fine. I would use a 0MOA mount.
 
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#3
1) Both of the scopes you listed have enough travel to correct for the max distance the 6.5CM load he'll be shooting could hypothetically reach using a 20-moa total setup.

If you run the numbers for, a 140 going 2750fps you could even get away with running no cant at all and still run it out to 1400-1500yds but that's not the optimal working range for 30 something MRAD scope.

The 20-moa rail on the RPR plus a 0-moa mount is all you really need if shooting 6.5CM which is why is such a common setup. Either 20 on the gun rail and zero on the mount of vice versa.

2) Going 40 moa (20 on the mount plus 20 on the rail) is not buying you more range since a straight 6.5 CM is going to start seriously gassing out at around 1500yds. You want to start stacking more cant on a magnum but not needed for a 6.5CM

3) Any mount of 1.5" height will work with the RPR and a 56 objective and leave plenty of clearance to handle the gun using the area under the bell if needed.

4) Not something he needs to mess with starting off. See answer 1.

5) Get a good 100yd zero as a baseline.
 
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#4
Mr. F said:
1) Both of the scopes you listed have enough travel to correct for the max distance the 6.5CM load he'll be shooting could hypothetically reach using a 20-moa total setup.

If you run the numbers for, a 140 going 2750fps you could even get away with running no cant at all and still run it out to 1400-1500yds but that's not the optimal working range for 30 something MRAD scope.

The 20-moa rail on the RPR plus a 0-moa mount is all you really need if shooting 6.5CM which is why is such a common setup. Either 20 on the gun rail and zero on the mount of vice versa.

2) Going 40 moa (20 on the mount plus 20 on the rail) is not buying you more range since a straight 6.5 CM is going to start seriously gassing out at around 1500yds. You want to start stacking more cant on a magnum but not needed for a 6.5CM

3) Any mount of 1.5" height will work with the RPR and a 56 objective and leave plenty of clearance to handle the gun using the area under the bell if needed.

4) Not something he needs to mess with starting off. See answer 1.

5) Get a good 100yd zero as a baseline.
Click to expand...


^^This


BTW, the way to figure out the maximum MOA in your mount that your scope will be able to get a 100 yd zero with is to divide the Total Elevation Range of Adjustment by 2. So for the Razor you could have up to 60 MOA before you hit the floor of the scope. That assumes that the rifle would zero perfectly at optical center, however, so leaving some wiggle room of at least 10 MOA will save you some irritation.
 
#5
Mr. F said:
1) Both of the scopes you listed have enough travel to correct for the max distance the 6.5CM load he'll be shooting could hypothetically reach using a 20-moa total setup.

If you run the numbers for, a 140 going 2750fps you could even get away with running no cant at all and still run it out to 1400-1500yds but that's not the optimal working range for 30 something MRAD scope.

The 20-moa rail on the RPR plus a 0-moa mount is all you really need if shooting 6.5CM which is why is such a common setup. Either 20 on the gun rail and zero on the mount of vice versa.

2) Going 40 moa (20 on the mount plus 20 on the rail) is not buying you more range since a straight 6.5 CM is going to start seriously gassing out at around 1500yds. You want to start stacking more cant on a magnum but not needed for a 6.5CM

3) Any mount of 1.5" height will work with the RPR and a 56 objective and leave plenty of clearance to handle the gun using the area under the bell if needed.

4) Not something he needs to mess with starting off. See answer 1.

5) Get a good 100yd zero as a baseline.
Click to expand...

This lock thread
 
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#6
20 moa is the norm and where you should start. No reason to go with 0 cant at all. Then you can go more. I have shot my 6.5 Creed to a mile and it needed about 24 miles of elevation. The scope I had on a 20 moa base and I topped out and had to hold about 4 mils in the reticle. Shooting that far isn’t my norm so no need to go with more cant but if you do plan to go farther then no reason not to go 40 moa. I run 40s on my Rimfire rifles.
 
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#11
Rob01 said:
Why didn’t you get the Razor?
Click to expand...
People don't know any better and don't listen to advice... People who have been out of the loop a long time still associate Vortex with cheap Chinese junk, and Leupold with "Merica" quality from the past...Despite the fact that the tables have flipped 180º on them. That's why I say Leupold is only "living on a legacy" but all the fanboys get pissy... It's just pure brand recognition. People know the name and associate it with past quality products... Which today's Leupold scopes are NOT. Obviously, by the number of similar responses in the MK4HD thread with all the crooked crosshairs, and shit not tracking right, and needing warrant replacements, I would wager a bet that this is not isolated just to this forum, and will become a much more widespread and prominent issue in the future, than anyone will admit.
 
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#14
FuhQ said:
People don't know any better and don't listen to advice... People who have been out of the loop a long time still associate Vortex with cheap Chinese junk, and Leupold with "Merica" quality from the past...Despite the fact that the tables have flipped 180º on them. That's why I say Leupold is only "living on a legacy" but all the fanboys get pissy... It's just pure brand recognition. People know the name and associate it with past quality products... Which today's Leupold scopes are NOT. Obviously, by the number of similar responses in the MK4HD thread with all the crooked crosshairs, and shit not tracking right, and needing warrant replacements, I would wager a bet that this is not isolated just to this forum, and will become a much more widespread and prominent issue in the future, than anyone will admit.
Click to expand...

Maybe he wanted a lighter scope...
 
#15
I have a few Vortex scopes and I like them. I haven’t bought a Leupold since they brought out the HD range. While my son says he wants to get into long range, his current rifle is more PRS than long-range set up, and I think he’ll shoot more PRS in the short term. The Leupold to me had a bigger eye-box, was a bit smaller and lighter. It just seemed simpler- reticle and dials. Kind of wanted to try one out, little bit cheaper.

I’m probably going to be buying a couple more 7-25/35 scopes in the next year. This one would work well on a 6ARC that I’m building if he doesn’t like it. Maybe by then the Vortex IV will be out.. or spring for a ZCO. He’s got some life ‘milestone’ events coming.

I’m just tickled pink, because when I started there were S&Bs and IOR.

One wife, lots of scopes…
 
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