We've been playing around with 300 yd shooting with the goal of having a Long Gong match soon. What I can tell you is that for 300 yd shooting with std velocity 22 ammo ( such as SK +/Match) you will need a total of around 50 MOA of adjustment to get from 50 yd Zero to 300 yds. ( That equates to compensating for a 12 1/2 foot bullet drop!) That adjustment can come from some mix of MOA in a rail, Internal adjustment in your scope turret and /or holdover with the reticle in a first focal plane recital. How you get there depends on equipment you have. As a rule of thumb, you can expect to have 1/2 the elevation in your turrets to be usable after a 50 yd zero. i.e. If you have a scope with 110 MOA of adjustment, you may have enough scope to get to 50 MOA without holdover or a rail.
So all that said, I can tell you from experience that most first focal plane scopes with 65 MOA of elevation adjustment (regardless of tube size) will get you there with a 15 MOA rail without having to hold over. .
I prefer something like a Vortex Venom or Strike Eagle but I know shooters doing it with a Diamondback tactical. All these scopes have enough adjustment, a good FFP reticle and glass that's clear enough to see your missed shots. Rifle wise, your Varmint should do just fine. at 300 yds, my 457's keep up with my Vudoo as it's more about reading the wind and ammo consistency than hair splitting accuracy.
FWIW, I'd suggest you start at 200 yds (which requires only 20ish MOA) to start. 300 can be super frustrating right out of the gate. At 200, it's still a challenge but wind and equipment is less of a factor.

There is more discussion on this topic if you go to the long range section of RFC . BTW, I assume your following Rob's Long Gong page on Facebook? Its a heck of a resource for this game.

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My cz 457 has a area 419 15moa rail on it and vortex gen2 pst 5x25x50 scope and can get to 300 with a 50 yard zero..
Shooting 300 yards with a 22lr is like shooting a centerfire at 1500 yards.. lol

 

Tacoma pretty well covers it... I have a CZ 455 Varmint with Lilja barrel set up for the 300 yard gong at one of the clubs I belong to, haven't fooled with it in quite a while.

 

Forgive me for asking, but wouldn't high velocity ammo be better suited for 300 yards? Or does it bleed speed too quickly compared to standard velocity? Seems like high velocity would have fewer clicks to go from 50 yards to 300?

 

High Velocity ammo is affected by the wind more !

 

I’m shooting a custom Ruger Precision with a 20” Shaw match barrel with an Arken 6x24x50 ffp with a 30 moa rail our first target is at 50 yards a KYL with the smallest spinner is a 1/4 inch we shoot to 275 yards because that’s all of the real estate we have on that range but wouldn’t have any trouble getting 300

 

Tacoma did a great job in his reply.
I can't add to that, but I can say that I shoot out to 220 yards with my 457 Varmint 22lr with a 15moa rail and a Vortex Diamondback Tatical without any issues. 50 yard zero is good to go.
I wish I could tell you how far my 457 could reach as set up, but 220 is my max available distance for now.
I am GUESSING that I could reach 300 yards with a 30moa rail if not with the 15moa currently installed.

Have fun!

 

The op tested the 3 types of ammo hyper velocity, high velocity, and subsonic velocity with hyper velocity having the most wind deflection at only 50 yards from a 5 mph cross wind and subsonic having the least by a substantial amount given the distance and high velocity in between both so that’s 50 yards imagine the difference between them at 300 and as HammerTech states in post #10 you have to go through the transition to subsonic also !

 

Tacoma sir

Signalman 🚦

 

I have a Arken EP-5 with the area 419 50 moa rail. I am sighted in at 50 yards and can go out well beyond 300 yards but still can go to 25 yards with no problems.

 

30 MOA is totally fine for shooting out to 300 but even as high as 50 MOA will still work for a 50 yard zero on most scopes. Your drop at 300 will be in the 14-16 MIL range which many scopes can do without a canted rail. Most of the popular scopes people use for Rimfire will be fine, but I'd pick something with at least 20 MILs, ideally 25-30.

Once you pass 400 you might run into issues depending on the elevation limits of your scope as you're getting into the 25 mil drop range.

 

I shoot to 200yds regularly. I haven't tried 300 yds.

 

I just shot my rifle yesterday, 20 MOA rail, 4x16 Arken ELP-4 no problem dialing to 300. Me and my friend were taking turns on a steel gong at 300 with good success. I haven’t measured the gong, guessing 6-8”, I was using some GECO Semi - Auto dialed in at 40 MOA on my turret with 50 yard zero.

 

I was always told it was the breaking back in from the sound barrier. Disturbances in the force is what I say.

 

I would say that has a lot to do with it also ! There’s smarter people than me on here for sure I just know what the people that have been shooting long range with.22s a lot longer than I have say and have studied extensively !

 

Forgive me for asking, but wouldn't high velocity ammo be better suited for 300 yards? Or does it bleed speed too quickly compared to standard velocity? Seems like high velocity would have fewer clicks to go from 50 yards to 300?

I suggest watching this GREAT video

 

I have seen their videos. Kind of puts a lot of doubt in your mind.

 

Also worth noting that the MOA rating of your rail should not exceed 1/2 the value of the MOA available in your elevation turret adjustment if you want to still keep a 50 yd zero.

i.e If your scope has 60 MOA of internal adjustment a any rail rated at 30 MOA or lower should work. If you put a 40 or 50 MOA rail under a 60MA rated scope, you may not be able to get down to a 50 yd zero. 50 MOA rails should be reserved for scopes with 100+ MOA of adjustment. This stuff ll works in harmony. It's important to know what works (and what doesn't) before blindly buying rails, rings or scopes.

FWIW, this is my current 300 yd favorite. Varmint VPC with Lilja barrel and Vortex Strike Eagle (5-25x56). That's a 50 MOA rail on there and it works great with the 110 MA of adjustment available in that scope. I know I could get away with allot less scope and rail but for 300 yds but I had the scope and got adeal on the rail.so..... (The SE is also bright enough for me to see my misses at 20X at 300.)
My bet is that I could go to 400 yds with this rig if I was good/foolish enough to try

 

20 MOA rail and Arken Sh 4J got me to 300 with adjustment left over.

 

After reading all the comments my first thought is to go with a 419 rail at 30 moa and Bushnell Match Pro 4.5 X 30. Not sure yet. I would like to hear more opinions from people with experience doing the actual shooting.

 

I shoot 300 yds with a 20 MOA rail and a Vortex Crossfire 6X18 44 which has 50 MOA adjustment. I use SK Long range in this rife( Win 75).

I also shoot 300 yds with a 457 Varmint with a 20 MOA rail and a 4X16 42 Vortex Diamondback which has 80 MOA adjustment. RWS R100

 

I use 20 MOA rails on all of my rimfire with Burris Signature XTR rings ( up to 40 Moa more with inserts ) I have 4 Vortex Strike Eagle 5 X 25 and 1 Arken EP-5 5 X 25. I have 30 MOA in the rings.The scope are near the bottom of the adjustment and have the full range to go up. I can zero at 50yds and can dial to 500yds.