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I have that scope on my 457 Varmint with a Area 419 15 MOA rail. It easily reaches 200 yards. I'd definitely recommend a 30 MOA rail or more for 300+. I don't have enough adjustment left for 250 yards.
So everything being equal and your scope is not out of spec from mine a 30 MOA rail should get the job done at 300.
I can't speak to your close range adjustment let's say at 50, but I believe others are shooting close range with the 30 MOA rail.

 

Awesome, that helps a ton. Thank you.

 

The problem is going to be that if you need any windage adjustment to zero you probably wont get the whole 56 moa of elevation.
the simplest route would be to get a 25 or 30 moa rail and test it. Then if you need more to get to 300 or less to get a 50 yd 0 you can get a set of Burris Z rings for your tube diameter. They have inserts that are slightly offset and allow you to adjust + or - elevation and windage in 5 moa incriminates up to 40 moa and you can fine tune your setup.
If you shoot in cool weather or at elevations below 1000 ft and use std vel ammo you may find you need 45-46 moa from a 50/0 on some days so you are going to need to be tuned in as close as possible to run the center of your adjustment.

 

At 300 yards bullet drop is all most 15 feet thats 180 inches , divided by 3 inch moa = 60 moa. So your scope and rail need to provide that in total. If you have a 30 moa rail , the scope needs 60 moa of total adjustment , cause you are only using 1/2 of that to go higher.

 

Hey Everyone

I'm about to purchase a CZ 457 for NRL22 and plinking from 0-300 yards. I'll be using a vortex Diamond Back 6-24x50 with 56 Moa of adjustment.

Currently I run this scope on my Marlin XT-22 and despite having 56 MOA of Elevation, when it's zero'd at 100 Yards, I only have 4 MOA of Elevation adjustment left.

My first assumption would have been that when zero'd at 100, I'd still have 52 MOA left. I know I need 40MOA of elevation to get to 300 yards. Should I be putting a 40 MOA rail on the new rifle or should I expect it to actually zero with no elevation adjustment.

Unfortunately it doesn't come with a 0 MOA rail for me to test and confirm.

I disagree with some of the advice you have here. If you want to zero your rifle at 50 yards, odds are a 30 MOA rail will not work with your scope; you will not be able dial down enough. A 25 MOA rail might barely work. But you will not know until you try. A 20 MOA rail should work well on both ends of the reticle. Using sub-sonic ammo, 45-50 MOA is required to dead-hold at 300 yards. A 20 MOA rail will likely get you there.

 

This is where my confusion lies. Should my rifle be able to zero at 50 or 100 yards with the elevation at the bottom of the adjustment? Cause if it should, theoretically I shouldn't need any MOA in my rail.

I'm leaning towards 20 MOA, I'm just confused about my current lack of elevation.

 

Your current lack of elevation is odd. It doesn't sound normal. I'd blame the rifle or rings if the scope is new to that rifle.
If you install it on another rifle with new rings and rail yet still have an issue I feel like Vortex needs to look it over.

 

Have a 300 yards rifle....

And have a 25-100 yard rifle

 

I have lots of 25-100 yard rifles, but at that point, why not just throw rocks.

Your current lack of elevation is odd. It doesn't sound normal. I'd blame the rifle or rings if the scope is new to that rifle.
If you install it on another rifle with new rings and rail yet still have an issue I feel like Vortex needs to look it over.

Both the rings and the scope are new. Previously, I had my rings bend with my old scope and rings due to offroading and packing in a soft case. After replacing those rings, I still couldn't hit 100 yards with the old scope. I assumed that was normal. So I think you may be right that it's the rifle.

Before replacing the old ones, with max windage adjustment it was off by a foot and a half at 25 yards

 

General rule of thumb is never install a base that the moa built into the base is more than half the total elevation adjustment on your scope.
Actually better if the base is a little less than half to give a bit of cushion and not be running the scopes turrets to their absolute extreme edges of adjustment.

If you need more elevation range to cover your shooting range variances then you need a scope with more total elevation adjustment.

Once you start reaching those extremes it is time to forget about most 1"tube scopes and start looking at the 30 or 34mm models which the larger tube allows more distance of travel.
But even then compare models carefully because there can be a big difference in total elevation adjustment available between on model or brand of a scope than another even though they both may share the larger tube size.

 

sorry for converstion math you may have to do to MOA...

Ive owned 4 Diamondback 6-24 FFP tactical in MILRAD. On a CZ with a 30 MOA rail and 2 inches of optic to bore height you can get a 50 yard zero and easily engage targets to 300, its after that you start using the reticle graduations but you will be near bottom of adjustment and are close to risk of getting a 50 yard zero, however only on a Bergara b14 with and EGW rail has this occurred making me wonder if its really more then 30 moa on that particular rail. It does get close such as 2-3 MILRAD to bottom out.

If 300yard is the overall max engagement range then a 20 MOA rail is also ok, and probbaly ideal. i have this setup on a 10/22 with 50 yard zero, on that rifle I have 5.4MILRAD down on the turret available so its more away from lowest range with 14 MILRADs elevation above zero available on turret.

20-25MOA should be very 'safe' choices for the use case. 30moa might introduce more optical low end of adjustment risk. The Viper PST2 seems to have more adjustment range with a 30mm tube as an aside, and my 34 and 35mm scopes easily handle 30moa rails.

 

Alright I just took a 2 Foot Level to my rifle barrel.

My barrel is bent downwards. 🧠 May or may not bother repairing.

20 MOA seems be the best bet for the new rifle.

 

I have a 25moa rail and about another 25moa in the rings.

 

Got a CZ457 in the MDT LSS chassis.

It comfortably shoots a 4 inch group at 200 yards with 20 MOA rail.

Haven't had the chance to get out farther yet.

 

Shooty, There is a lot of good advise in this thread.

If you still have 24 MOA of adjustment with your CZ457 in the MDT chassis after shooting 200 yards you can dial to 300 yards. If not you will need more rail.

My 457 with a 25 MOA rail and a 1" tube scope zeroed at 50 leaves 7 MOA down and 36 MOA up. I can only get to 225 yards and don't have a christmas tree to help with hold over. Best of luck in your venture.

 

I run an old 4.5 x14 Leupold, I originally had Tally style rings that screwed directly to the action ( Bergara) with a 50 yard zero, I had 38 MOA of elevation left, I think I was able to dial to about 260 yards.
I was doing lots of 200-300 stuff at the time so I went to a 20 MOA rail, I estimate I can dial to 325 or so now, the scope has no zero stop but when set at 50 yards I only have a 1/4 rotation left going down. Approximately 58 going up. So a 30 MOA rail probably wouldn’t zero at 50 yards with my scope.
I know your system is different but maybe this will help. 🤷‍♂️

 

Many rifles have some barrel droop. 10/22s are notorious for this. Result is the reticle in mid-adjustment range often yields a very low POI. So you use alot of adjustment range just to get to 50 yds. If the scope has limited range you're out of luck.

It's good to remember that all vertical adjustment below zero is wasted. IME, it's a rare .22 and scope combination that cannot be zeroed at 50 yds with a 20-25 MOA rail in place.

I typically put a 20-25 MOA base on receiver. Then use Burris Signature Z rings with shims in conjunction with a scope having great adjustment range, eg., SWFAs. So configured, and with the 40 MOA ring inserts, my 10/22 will get to 400 meters and then some by adjustment. That's not even counting using the reticle for additional correction.

 

I have a 25moa rail and another 25moa in my rings and am still zeroed at 50yards with 1.5 mil to spare. I can dial to 400.

 

With respect to the people with 20 and 25 MOA rails, what ring height do you run?

 

I am using Burris XTR Signature 1.25 rings set at 25moa and a DIP 25moa rail. I am zeroed at 50 yards.

 

Using a CZ 457, I’m torn between a 30 MOA and a 50 MOA scope mount base for shooting long range