50 at 200 - Page 2 - RimfireCentral.com Forums

Go Back   RimfireCentral.com Forums > >

Notices

Join Team RFC to remove these ads.
Reply
 
Thread Tools Display Modes
  #16  
Old 06-26-2018, 12:13 PM
doubs43
US Air Force Veteran NRA Member - Click Here To Join!

Join Date: 
Apr 2008
Location: 
Middle GA, USA
Posts: 
5,109
TPC Rating: 
100% (2)


Log in to see fewer ads
Quote:
Originally Posted by jaia View Post
Vertical spread is the reason doubs.
I do almost all my range shooting at 200 yards.
1 fps difference in mv is 1/10th inch of vertical spread with standard velocity 22lr.
I can destroy the aimpoint if I zero there. A substantial number of rounds will hit tight
but the strays caused by mv differences spread vertically quite a bit.
Add a tailwind, or turbulence, the vertical for 50 shots can be 14 inches top to bottom.
With the aimpoint above the group it's there for all 50 shots.
Put it at the zero point and there's a good chance it'll disappear halfway through the run.
Thanks for explaining. When I have the chance, I'll try it both ways.
Reply With Quote
  #17  
Old 06-26-2018, 12:35 PM
jaia
NRA Member - Click Here To Join!

Join Date: 
Apr 2014
Posts: 
5,929
TPC Rating: 
100% (2)
I do know I will not be able to see the point of aim with iron sights at 200 yards.

Dave, use a standard 14" diameter target mounted high on the frame.
With a 100 yard zero a typical standard velocity 22lr will impact
about 46 inches to 54 inches below point of aim at 200 yards.
With the 14" diameter target up high and the center of cardboard 48 inches below
there'll be no need to change your sights. Same with a scope set for a 100 yard zero.
And, the sighting target will never be hit and can be reused for years.

I did this in the past before installing a 25 moa rail on the 455.



Aimpoint is at the top of the frame, targets at poi 46 to 52 inches below.



I'll probably do just that with my Marlin 60.
We'll be able to see how my squirrel rifle does at 200 yards without messing with the optics.

Last edited by jaia; 06-26-2018 at 12:43 PM.
Reply With Quote
  #18  
Old 06-26-2018, 04:23 PM
CamP is online now

Join Date: 
Apr 2015
Location: 
Fort Worth
Posts: 
903
TPC Rating: 
0% (0)
Here's a quick 10 shot group at my 16" gong set at 220 yards. The wind is howling at about 20mph over my left shoulder. First shot blew about 6" to the right at 3 o'clock. Held left and shot the 7 round group, which measured 6.5".

Shot the last 2 off hand, which landed at 12 and 2 o'clock.

Gun is a Winchester 9422 with iron peep sights. Geco rifle ammo.
Attached Images
File Type: jpg 20180626_150302_1530044466701.jpg (395.2 KB, 35 views)

Last edited by CamP; 06-26-2018 at 04:28 PM.
Reply With Quote
Sponsored Links
Advertisement
 
  #19  
Old 06-26-2018, 06:11 PM
David Valdina
US Marines Veteran NRA Member - Click Here To Join!

Join Date: 
Aug 2004
Location: 
Barefoot Bay, Florida and Cape Cod, Massachusetts
Posts: 
2,882
TPC Rating: 
100% (2)
.17 @ 200 yards, video

Here is a video in light air of a .17 HMR at 200 yards. A tad over two inch group.
https://www.youtube.com/watch?v=DgpXa0wWMz0
Reply With Quote
  #20  
Old 06-26-2018, 09:09 PM
jaia
NRA Member - Click Here To Join!

Join Date: 
Apr 2014
Posts: 
5,929
TPC Rating: 
100% (2)
In the RFC CZ forum, we have the 100/200 yard challenge.
If you want to see sub-moa rimfire at longer range, look at the posted results.
We've been doing it for a couple years now.
Every month different targets and scoring methods.
Reply With Quote
  #21  
Old 06-30-2018, 11:00 AM
jaia
NRA Member - Click Here To Join!

Join Date: 
Apr 2014
Posts: 
5,929
TPC Rating: 
100% (2)
Here's an hour and a half spent with the CZ 455 Son of Fuglie Lilja 17 hmr
on a Sinclair F-Class Bipod. Set trigger, Mueller 8-32x44 target model
Near calm, variable, 85 degrees F, minimal mirage






Vertical spread of 5 inches is due to muzzle velocity differences.

Last edited by jaia; 07-28-2018 at 10:34 AM.
Reply With Quote
  #22  
Old 06-30-2018, 12:57 PM
jaia
NRA Member - Click Here To Join!

Join Date: 
Apr 2014
Posts: 
5,929
TPC Rating: 
100% (2)
Same setup





Large circular pattern is caused by bullet seating.
ES is only 100 fps, not enough to create that much vertical.
100 fps would produce about 3 inches.
Seating depths varied and roll a cartridge on a flat surface
the bullet tips had a visible wobble about the axis of rotation.
Not a surprise to see such a large pattern from poor bullet alignment.

Last edited by jaia; 06-30-2018 at 02:05 PM.
Reply With Quote
  #23  
Old 06-30-2018, 03:40 PM
alum572's Avatar
alum572 is online now
NRA Member - Click Here To Join!

Join Date: 
Jul 2010
Location: 
Gopher state
Posts: 
4,542
TPC Rating: 
100% (44)
jala- I appreciate your posts showing lack of consistency with ammo mfg. processes. Variations surely show up at the longer distances. It'd be interesting to see how groups with the same ammo would fare in a 200 yard enclosed tunnel where wind, mirage, etc. could be eliminated. Another thing I'm going to gather from your testing: if I miss, it may not be me after all.
Reply With Quote
  #24  
Old 06-30-2018, 04:35 PM
jaia
NRA Member - Click Here To Join!

Join Date: 
Apr 2014
Posts: 
5,929
TPC Rating: 
100% (2)
It's easy to tell when it's me.
Just look though the scope and it's dancing around the bullseye.
If I have a bad case of the yips I put the rifle away and head to the pistol range.
This morning I was relaxed and steady.
With the Sinclair and the heavy stock rig, no problem maintaining sight picture.
Early morning and mirage hadn't had a chance to set in.
No one using the rifle ranges at the local club. No big bangs to startle me.
The bright green sticker shows up clearly at 32x.
Center the crosshair, relax, squeeze, watch the hole appear.

Last edited by jaia; 06-30-2018 at 04:40 PM.
Reply With Quote
  #25  
Old 06-30-2018, 04:46 PM
alum572's Avatar
alum572 is online now
NRA Member - Click Here To Join!

Join Date: 
Jul 2010
Location: 
Gopher state
Posts: 
4,542
TPC Rating: 
100% (44)
My scopes are limited compared to yours. 32x I might get if I added two 9's and a 14 together.
Reply With Quote
  #26  
Old 06-30-2018, 04:57 PM
jaia
NRA Member - Click Here To Join!

Join Date: 
Apr 2014
Posts: 
5,929
TPC Rating: 
100% (2)
By dialing your crosshairs up, you can use a lower power scope.
Mount a large diameter target to aim at and you have an aimpoint to work with.
Bullets will impact below the large target that a low power scope can easily center on.
The only excuse not to attempt 100 yard plus rimfire is lack of shooting distance.
Some ranges only offer a maximum of 100 yards.

Big target up high, it's what I'll have to do with my Marlin 60.

Last edited by jaia; 06-30-2018 at 04:59 PM.
Reply With Quote
  #27  
Old 06-30-2018, 05:00 PM
alum572's Avatar
alum572 is online now
NRA Member - Click Here To Join!

Join Date: 
Jul 2010
Location: 
Gopher state
Posts: 
4,542
TPC Rating: 
100% (44)
Correct. At my range, only centerfire are allowed on the part that runs out to 250.
Reply With Quote
  #28  
Old 06-30-2018, 05:09 PM
jaia
NRA Member - Click Here To Join!

Join Date: 
Apr 2014
Posts: 
5,929
TPC Rating: 
100% (2)
I'd have to have a talk with the range manager.
Quick discussion using a ballistic calculator would prove that it's safe.
Even the 22lr standard velocity trajectory peaks at only 20 inches above the sight line at 200.
It ought to be feasible to set up shooting times for rimfire
so the centerfire guys won't feel threatened.

Last edited by jaia; 06-30-2018 at 05:12 PM.
Reply With Quote
  #29  
Old 07-01-2018, 11:04 AM
jaia
NRA Member - Click Here To Join!

Join Date: 
Apr 2014
Posts: 
5,929
TPC Rating: 
100% (2)
Wind kicked my adze this morning.
200 yards, Lapua Polar Biathlon 22lr
CZ 455 Varmint, Lilja sporter barrel, Mueller 8-32x44
Heavy bags, chrony out front, 84 degrees F, no mirage due to wind



Conditions and muzzle velocities



36 fps ES explains the 4 inches of vertical, 8 inches of horizontal was wind.

Could not time a shot to save my life.
Some spots no wind showing, other spots grass leaning over.
Direction depended on which swirl was traveling across the range.
Like to drive me nuts...it was so much fun.

Last edited by jaia; 07-01-2018 at 11:24 AM.
Reply With Quote
  #30  
Old 07-01-2018, 12:36 PM
gcrank1's Avatar
gcrank1

Join Date: 
Apr 2018
Location: 
south central WI, USA
Posts: 
3,508
TPC Rating: 
100% (3)
These pics are certainly showing why/how Ive missed the properly scaled for 200yd. ram silhouettes off cross sticks.....you would think they would be gimme’s.
That range is in a cut between two bluffs and the wind is usually every which way.
Last shoot I got 8 of 10 and felt pretty good about it, best Ive done in a few years.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off




All times are GMT -5. The time now is 06:42 PM.

Privacy Policy

DMCA Notice

Powered by vBulletin
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Search Engine Optimisation provided by DragonByte SEO (Lite) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©2000-2018 RimfireCentral.com
x