Pin hole on my glasses helps

[mjm46@bellsouth.net]

I recently put a piece of electrical tape with a 1/16" hole on my shooting glasses and I got to try it out this weekend. It gave me a much, much clearer sight picture but changed my POI somewhat.

I had always shot 80 grain charges for everything before. But, with my vision problems, changing charges didn't seem to make a difference to my shooting. At 25 yards I was right on but at 50 yards. Results at 100 yards were a $#@* shoot.

After putting the tape on my sight picture vastly improved. But it had an unexpected result as well. At 25 and 50 yards it raised my POI about 2 inches.

At 100 I didn't notice a change in POI because I never shot much at 100 as it was a visual blur. I could hit the paper but that felt like an accomplishment and it had no consistent group.

So, I dropped the 25 yd charge to 70 grains and it zeroed well with three shots touching in the 10 ring.

At 100 my first 3 shots were about 3" low and a 3" group.  I upped the charge to 90 and the group closed up to about 2". So I upped it to 100 and with six shots blew the x ring out of the target. Never remember doing that ever. So I am pleased with that.

Now my problem is I'm zeroed at 25 yards and 100 yards and 2" high at 50 yards. 70 grains did not move the POI down at all it's in the same spot as it was with 90. About 2" high at 50 yards. Holding low 2" at 50 yards puts the POI right on, is that the solution?

Should I go try a lower charge for both 25 and 50 or create a different charge for fifty. I need to experiment more. Any suggestions? I don't want to adjust my sights.

[PPatch]

I believe I will try the tape trick. Are you shooting your .50 caliber Mike?

dave

[mjm46@bellsouth.net]

Hi Dave
that was with my 50 Cal.

Maybe I was just having a good day but that pinhole in the tape worked great.

[Standing Bear]

I've been lucky that, in my 50s, 60 gr FFg is good at 25 and 50 yards and 90 gr is on at 100. A lot will depend on height of sights, barrel thickness, touch hole sz etc.
TC

[mjm46@bellsouth.net]

Maybe I'll give 60 grains a try and see what happens at 25 and 50 yards. Can't hurt to try.

[Black Jack]

Would changing the location of the tape affect your POI? Also, it's possible that with the increased depth of field and increased sharpness of your sight picture, you are not holding the sights in quite the same alignment as you did with your old, fuzzier sight picture.

[Kermit]

My guess is that with the pinhole the focus of the sights, especially the rear, has been sharpened so that what you saw as the top edge of the sight before is not what you're looking at now that things have been brought into sharper focus. Keep shooting with the pinhole in different lighting levels and my guess is you'll see better groups in spite of low/high ambient brightness.

[Bill Paton]

I agree with Kermit and Black Jack about the pin hole not changing the POI, but changing the aim point through sharpening especially the rear site and bull. Without a pin hole lens, all of my rear sites are lined up on top of each other and I never know which one to use. The bull is so fuzzy that I can't define its edge. That is much improved with the pin hole lens. The pin hole I've been using for years is black electrical tape cut into a 5/16" circle with a 1/16" round hole cut in center. I use leather punches for the circles and holes and keep a few spare pin holes on a credit-card-like piece of plastic in my hunting bag. One goes in the upper left part of my right glasses' lens at just the right spot for centering on my site picture. Being only 5/16" in diameter, it doesn't interfere with regular vision because it is tucked out of the way except for shooting. It does wonders for "old age shooting problems", but doesn't work in very low light at dawn and dusk when the moose are most likely to be found. They are great for musk ox and caribou which we hunt in the daylight.

I just read in "Steinschloss Jagerbuchsen" by Wolf that the "tang peep" on German target rifles were really "apertures" for sharpening the site picture for regular open sites, and were not used as peep sites as we use them today. They were just fancy electrical tape!

[dagner]

 where you put  the pin hole on your glasses -same as a merit disc will affect how you put your face on comb of  the gun/hold the gun  and angle you see the sights. you can ans will change your piont of impact from this.

[Bill Paton]

Dagner's point is well made. That is exactly why I select my pin hole spot by holding my gun in the usual way, aligning my normal site picture as always, noting the exact spot on my glasses lens that aligns with the site picture, and placing the disc of electrical tape exactly there. Then when I shoot, I don't vary from my normal hold. I see illustrations of pin hole lenses placed near the center of glasses lenses. That would make me hold the rifle really awkwardly. My pin hole ends up in the upper left corner of my right glasses lens for shooting and doesn't interfere with forward vision.

[hammer]

So you don't have to keep sticking tape on your specs.
Buy a pair of those cheap clip on/flip up sun glasses.   Fit to your specs, get into your normal shooting position and make a dot with a marker pen on the sun glasses lens in line with your sights.   Remove the sun glasses and make a small hole on the dot with a red hot needle.  Rub the front of that lens with a green scrubber to roughen the surface and spray over with a matt black car spray.   Keep in a protective case in your shooting box.   Before/after shooting just flip them up out of the way.
I have two holes in mine: one for rifle and one for pistol.
I have had mine for 10 years now.



   

 

[drago]

That's a good idea

[Kermit]

I use a small paper clip with one end straightened. Sort of makes a handle on a wire. Heat it with my butane micro torch (any heat will do; maybe a candle even) and melt the hole in the tape. Makes a clean hole.

[Bill Paton]

Great ideas, Hammer and Kermit!