View previous topic :: View next topic |
Author |
Message |
chambered221 Super Member


Joined: Aug 17, 2007 Posts: 3455 Location: Lost for good !!!
|
Posted: Tue Mar 11, 2008 4:10 pm Post subject: Testing groups @ 25 yards |
|
Was in a gun shop today talking to a guy that was working up a load for his newest deer rifle.
He starts telling me about his 25 yard groups and how good they are.
My question is, does anyone else do this?
I've always started at 100 yards then checked them at 200 yards.
Can groups at 25 yards give you any viable information?
I thought evryone worked at 100 yards with a high power!!!!!!!!!!!!!!!!
_________________ Ask as many people needed, sooner or later your question will be answered the way you want it answered !!!
A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government.
~George Washington |
|
Back to top |
|
 |
wncchester Member


Joined: Apr 08, 2006 Posts: 160
|
Posted: Tue Mar 11, 2008 4:56 pm Post subject: Re: Testing groups @ 25 yards |
|
As a general rule, you are right. But, 25 yd. groups would be 1/4 of the 100 yard group size.
|
|
Back to top |
|
 |
mikeleduc Member


Joined: Jan 23, 2008 Posts: 69 Location: Phoenix, AZ since 1972
|
Posted: Tue Mar 11, 2008 6:24 pm Post subject: Re: Testing groups @ 25 yards |
|
I use 25 yard groups for my pistols. Mine are mostly 4 or 6 inch barrels. I doubt a rifle group at that range would be too useful or tell you much of anything.
|
|
Back to top |
|
 |
hunthard24/7 Rookie Member


Joined: Dec 10, 2007 Posts: 21 Location: Southeast Missouri
|
Posted: Tue Mar 11, 2008 6:26 pm Post subject: Re: Testing groups @ 25 yards |
|
I usually start at 25 with a newly mounted scope. Eveything else is at 100, 200, or 300
|
|
Back to top |
|
 |
Pumpkinslinger Super Member


Joined: Sep 22, 2007 Posts: 4956 Location: NC foothills
|
Posted: Wed Mar 12, 2008 12:15 am Post subject: Re: Testing groups @ 25 yards |
|
I shoot a new scope at 25 yards just to get on paper and then move out for testing. All centerfire rifle groups are shot at 100. Rimfire at 50. I shoot ironsighted handguns at 25, scoped handguns at 75-100. I've been "zeroing" centerfire rifles at 100 yds but, for a "deer" cartridge, I usually set the point of impact 2" high at 100.
_________________ Mike
"I ain't no better than anybody else, and there ain't nobody better than me!" Ma Kettle |
|
Back to top |
|
 |
Vince Site Admin


Joined: May 25, 2005 Posts: 15476 Location: Brisbane AUSTRALIA
|
Posted: Wed Mar 12, 2008 12:24 am Post subject: Re: Testing groups @ 25 yards |
|
Punkin Slinger wrote: |
I shoot a new scope at 25 yards just to get on paper and then move out for testing. All centerfire rifle groups are shot at 100. Rimfire at 50. I shoot ironsighted handguns at 25, scoped handguns at 75-100. I've been "zeroing" centerfire rifles at 100 yds but, for a "deer" cartridge, I usually set the point of impact 2" high at 100. |
I do pretty much what Punkin does. 25m to get on the paper then out to 100m for grouping and accuracy testing/confirming with the centrefires and 25m/50m for my rimfires.
However, if you are only doing early load development without being too concerned about accuracy then I suppose 25m is ok. Realistically though, you are kidding yourself if you are judging the accuracy of your whiz bang centrefire deer rifle.
When I was in the Army we did all of our zeroing at 25m with confirmation at 100m. For our qualifying shoots we did them between 100m and 300m, although just before I discharged they got right into the WETS system... but that ain't real shooting.
Cheers, Vince
_________________ Cheers, Vince 
Illegitimi non carborundum
(Never let the bastards grind you down)
Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God.
"Nulla Si Fa Senza Volonta."
(Without Commitment, Nothing Gets Done) |
|
Back to top |
|
 |
tikkat3 Super Member


Joined: Jul 30, 2006 Posts: 797
|
Posted: Wed Mar 12, 2008 12:28 am Post subject: Re: Testing groups @ 25 yards |
|
If its more than one shot at 25 its a waste in centrefire.
I test at 100 and centre at 200.
I use 50 to practice offhand.
|
|
Back to top |
|
 |
Morax Super Member


Joined: Dec 18, 2006 Posts: 618 Location: Pittsburgh Pa
|
Posted: Wed Mar 12, 2008 3:54 am Post subject: Re: Testing groups @ 25 yards |
|
i beenvery lax te past year wit shooting and sightig in, i usually do as descibed above fr pistol but nothing past 25 yards, since anything pat 7 yards is not self defense anymore. for rifles, well rimfires i dont go past 100 bu i zero at a happy medium around 75 yrds.. from there shoot itlike crazyto KNOW where it will hit. center fires or hg power if you will, i had sighted fo 200 but dint feel right too itback out resighed for 100 but know where it will hit for in between..
|
|
Back to top |
|
 |
sniper Super Member


Joined: Aug 18, 2005 Posts: 735 Location: Utah
|
Posted: Wed Mar 12, 2008 9:00 am Post subject: Re: Testing groups @ 25 yards |
|
Annnnddd...the reason for all that is: The bullet first crosses the line of sight, scope mounted ~ 1.5in. above the bore, at about 25 yards, rises to its max height about 150+- yds., then gravity takes over, and it starts to fall.
Center the bullseye with the bullet/group at 25, it should be on paper at 100, but it takes 4X as many clicks at 25 yds. 4 clicks @ 1/4"= 1" at 100, 16 clicks @ 25yd.= 1 in.
2-3 shots should be enough to be sure it is all pointing the same way, then... to the 100yd and beyond ranges to dial it in.
Like pumpkinslinger said, 2-2.5in. above center will maximize point blank range. (The distance that the bullet is no more than 3-4in. below point of aim, funny enough, with most standard cartridges, occurring somewhere between 270-290 yds. (Not a bad neighborhood to be in, imo.  And, it should rise no more than 3+- in. on its way to the target.
|
|
Back to top |
|
 |
ElyBoy Super Member


Joined: Apr 04, 2006 Posts: 1541 Location: Forest Lake Minnesota
|
Posted: Wed Mar 12, 2008 9:49 pm Post subject: Re: Testing groups @ 25 yards |
|
It happened last year to me.
A fellow was at the 25yd Pistol Range with his rifle when I walked in to shoot my 1911.
I didn't know the guy, but he showed me a "great group" that he had shot.
The group was at best 2".
I congratulated him, then proceeded to shoot a much tighter group with my .45 ACP.
I said nothing, but the guy saw my group, and left without comment.
Sometimes idiots get caught, sometimes they don't, but it sure is fun to quietly shut an idiot up once in a while.
Like the guys said, one shot at 25yds with a new scope, then over to the long ranges where the men play.
Eric
_________________ NRA Certified Chief Range Safety Officer
NRA Certified Pistol Instructor
DNR Certified Firearms Safety Instructor
NRA Life Member |
|
Back to top |
|
 |
gelandangan Super Member


Joined: May 07, 2006 Posts: 6358 Location: Sydney Australia
|
Posted: Wed Mar 12, 2008 11:37 pm Post subject: Re: Testing groups @ 25 yards |
|
The SSAA range here in Sydney NO LONGER have rifle target set up less than 100meters !!!
I have to sight in my last two rifle at 100meters!!!
Considering that my ammo are all low velocity, it is very hard to get the setting right with less than 5 shots.
Talk about a waste of brain cells on whoever made that decision 
_________________ A straight line is the shortest distance between two points.
A smile is the shortest distance between two people.
Do - Not try!
gelandangan.weebly.com/ |
|
Back to top |
|
 |
Vince Site Admin


Joined: May 25, 2005 Posts: 15476 Location: Brisbane AUSTRALIA
|
|
Back to top |
|
 |
Pumpkinslinger Super Member


Joined: Sep 22, 2007 Posts: 4956 Location: NC foothills
|
Posted: Wed Mar 12, 2008 11:56 pm Post subject: Re: Testing groups @ 25 yards |
|
I've had handgun shooters brag about the 6" "pattern" they were getting at 10 yards... I did agree that it was a pattern!
_________________ Mike
"I ain't no better than anybody else, and there ain't nobody better than me!" Ma Kettle |
|
Back to top |
|
 |
tikkat3 Super Member


Joined: Jul 30, 2006 Posts: 797
|
Posted: Thu Mar 13, 2008 12:28 am Post subject: Re: Testing groups @ 25 yards |
|
Some people like to make nice patterns.
|
|
Back to top |
|
 |
SingleShotLover Super Member


Joined: Dec 26, 2007 Posts: 1004 Location: Illinois
|
Posted: Thu Mar 13, 2008 5:07 am Post subject: Re: Testing groups @ 25 yards |
|
As a lot of shooters of long, heavy bullets at medium velocities know, 25-yard groups may well be larger than those at 100 or further. This is due to a phenomenon variously called "yaw", "nodding" or "bullet sway". In essence, the bullet nose is traveling out of line for a short distance before it is finally stabilized and actually "orbiting" the line of flight. Within a relatively short distance it "goes to sleep" and aligns with the flight path. Until it does so, the point of impact can vary quite a bit. This differs with each caliber and rifle, but I have seen 25-yard targets that were larger than those shot at 200 with the same load.
Isn't our sport fascinating?
_________________ If you can't hit it with one, you probably can't with two either!
The biggest problem with a closed mind is that it never seems to come with a closed mouth.
SSL |
|
Back to top |
|
 |
|