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aperture preferences? (Read 4826 times)

bushka Participating Member Offline Posts: 25 Joined: Feb 10^th, 2008	aperture preferences? Apr 27^th, 2008 at 9:44am	Print Post
	I`ve never read a primer on how to select which diameter/styles of front sight inserts or eyecup holes. What is S.O.P.? with these? I have a Lyman 17a front sight,Hadley rear.Next outing I`ll try just the clear yellow tinted front insert. I suspect I should select the rear aperture according to light conditions, or whatever view is "crispest"?? Are there cards for 17a with thinner rims?,Lymans have a pretty thich edge that blocks out more light,dont know if thats good or bad.. thanks!! Billy


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Brent Ex Member	Re: aperture preferences? Reply #1 - Apr 27^th, 2008 at 9:51am	Print Post
	Billy, Lee Shaver makes thin rimmed apertures for the 17a, Snover makes thicker ones, and Jim Kluskans of Distant Thunder will make whatever you want. Thicker will give some people crisoer images. Hole diameter needs to be big enough to see some of the outer white around the bull. How much depends on you. The rear aperture should be as small as it can be while giving a good image. But that said, it is hard to see a difference if you end up stuck with a larger rear aperture. Don't sell crosswires short either. I prefer them for offhand and for silhouettes. Brent


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tenx Senior Forum Member Offline Posts: 385 Joined: Feb 23^rd, 2008	Re: aperture preferences? Reply #2 - Apr 27^th, 2008 at 6:14pm	Print Post
	Billy, This gets into which do you prefer.... blondes or brunettes. The front aperture should be. like Brent says, big enuf to see some white around the black. The amount will depend on two factors. The first is the size of the rear aperture. This should be big enuf so that you don't see a fuzzy edge around the inside. I usually have to take what's available and open this up with a taper reamer to get what I need. Make sure you put the "big" side of the taper towards the muzzle. This will give a nice sharp edge to the aperture which helps in getting a sharp view. The front aperture can then be attended to. Looking thru the rear aperture the front aperture should be large enuf that you see the black of the bull distinctly, with a nice sharp edge around the outside. The length of the barrel determines this diam. to some extent. There are some, and I'm one of them, that like a little more white showing than is necessary. The really big problem is that on a partly cloudy day you will find the rear aperture going in and out of focus as the clouds pass over the Sun. This is where a Hadley eyepiece comes in handy. These will have several aperture sizes. Of course you can have several single hole eyepieces of different sizes to, but it's a hassle to be constantly switching them and before you know it you're telling yourself a little fuzziness doesn't matter. PETE


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bnice Frequent Elocutionist Offline Posts: 1919 Location: Iowa Joined: Nov 30^th, 2006	Re: aperture preferences? Reply #3 - Apr 27^th, 2008 at 7:14pm	Print Post
	Recommended front (ISU recommendation) is big enough to have for a white line around the black that is half the dia. of the black on each side of the black. The rear should be sized for the light condition. If you had a adjustable rear you would adjust it until the image just gets darker and then open it one or two steps. That is the optimum amount of light coming through for your eye. at that point it should look as good as it is going to get.


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bushka Participating Member Offline Posts: 25 Joined: Feb 10^th, 2008	Re: aperture preferences? Reply #4 - Apr 27^th, 2008 at 7:47pm	Print Post
	bnice, you are saying then,the white around the bull should be 1/2 the diameter of the bull itself? that makes for a nice amount of white @100yds, 3" on each side of a 6" bull? thanks again all, B
	« Last Edit: Apr 27^th, 2008 at 7:57pm by bushka »

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Paul_F. Ex Member	Re: aperture preferences? Reply #5 - Apr 27^th, 2008 at 9:01pm	Print Post
	That's correct... 3" on each side of a 6" bull would be the "correct" starting point for your front aperture. At least, that's what the conventional wisdom says for Smallbore Prone, and for Highpower Rifle. The usual caveat is that if you choose to experiment, the consequences of picking an aperture that's "too big" is less than picking one thats "too small". Too small and you will experience "light bending" and warping of the bull in your sight... making it impossible to be pointed at the MIDDLE of the bull. Err on the side of too big if you must err. I learned that the hard way in Smallbore Prone. I spent an entire frustrating season throwing 7's and 8's in a sport where anything less than an X or 10 will put you out of the running. Hope this helps! Paul F.


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J.D.Steele Ex Member	Re: aperture preferences? Reply #6 - Apr 27^th, 2008 at 9:31pm	Print Post
	What Paul said. Good luck, Joe


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MI-shooter Moderator Offline Posts: 698 Location: SE Michigan Joined: Apr 18^th, 2004	Re: aperture preferences? Reply #7 - Apr 27^th, 2008 at 10:52pm	Print Post
	I've been told to select an aperature that is also twice the size of the bull as others have stated. How do you find this? Select an aperature that at whatever range you shoot at, you place the left side of the inside hole of the front aperature on the left edge of the bull (bull is not centered) and your bullets impact the right edge of the bull. This means your aperature is 2x the bull size. Sounds complicated but it works and is easy to do. This is a good starting point. I like to use clear aperatures for the front. Now some shooting sports do not allow them but ASSRA rules are OK with them. Pays to know your rules! I get them from Neil Price in the UK. His delivery and quality is top notch. You get a set of 10 for around $20 USD depending on shipping and exchange rates. He can be contacted through neilwprice at aol dot com (you know the conversion). I do have his permission to post his contact info. Good luck


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waterman Frequent Elocutionist Online Posts: 2898 Location: Behind the Redwood Curtain Joined: Jun 9^th, 2004	Re: aperture preferences? Reply #8 - Apr 28^th, 2008 at 12:39am	Print Post
	I've been having some trouble with my eyesight and I've switched from Lyman inserts to Lee Shaver inserts for my 17A front sights. They do let in a bit more light. Brent's advice about cross hairs is worthy of note. The Lee Shaver cards include a cross hair insert. FWIW, I think I read in the 3-volume German Schuetzen book set that cross hair front sights were verboten. There must have been a reason for ruling them off the range.


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boats Frequent Elocutionist Offline Posts: 7652 Location: Virginia Joined: Apr 23^rd, 2004	Re: aperture preferences? Reply #9 - Apr 28^th, 2008 at 7:33am	Print Post
	Advice is right on. most people shoot best with large front sight arp's and too big is better than too small. Rear it's good to be able to adjust for light conditons but again large is better than small. Smallbore Prone introduced me to this too, That game requires extreme precesion with iron sights and experenced shooters have figured it out. My past experence made me skeptical, now am convinced it's the way to go. Another trick they showed me in SB prone is to get the sight picture, close your eyes and break the shot as soon as you open, first look is the best. This works very well with "older" shooters. Boats


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