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Post by mhblaw on Mar 27, 2018 10:58:34 GMT -5
Had my 5oth Ann. .357 FT (4.75") at the range last week. At 50 feet with a plinking load (158 gr. SWC @ 800fps)I had to raise the rear sight all the way up to hit the paper. Got home and compared the NM to my OM FT (1958 vintage, 4.75") and determined that the measurement from the center of the bore to the top of the front sight on the NM is almost a tenth of an inch higher than the OM. What gives? Why would the front sight on the NM be that much higher? Time to get the file out? Or? I have several OM and NM Ruger SA's, shoot all calibers from 22 to 45 with mostly cast bullets in the 800/900fps range and have not had this problem before.
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Post by magnumwheelman on Mar 27, 2018 15:37:20 GMT -5
I found that both my polished stainless 45 Colt Vaqueros needed the front sight trimmed with my CAS loads...
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Post by bigbrowndog on Mar 27, 2018 15:56:34 GMT -5
Possibly due to heavier bullets, and higher velocities being used today?? It allows the user to “tailor” the front sight without needing to replace it.
Trapr
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Post by coldtriggerfinger on Mar 27, 2018 20:18:42 GMT -5
I need taller front sights on 2 of my revolvers. I get tired of having to aim at the bottom of the target just to hit the top of it.
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Post by sixshot on Mar 28, 2018 1:08:22 GMT -5
I have taller front sights for the pinned revolvers, also have fiber optic sights & rear peep sights.
Dick
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Post by magnumwheelman on Mar 28, 2018 5:49:18 GMT -5
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Post by bradshaw on Mar 28, 2018 6:45:49 GMT -5
mhblaw..... if you don’t want to file the front sight to raise POI, look for a higher INSERT for the Ruger sight, or an aftermarket sight, many of which were fitted with a taller blade than comes standard. Over the years, Ruger offered rear sight slides with notches from .100” to .109”, to old standard Blackhawk/Single Six window-width of .125” (1/8-inch). Introduction of a .142” wide notch on the Security Six double action turned the rear notch into a plague of excessive width. It was the dumbing down of handgun marksmanship. The .142” notch spread its horrible sight picture to the Super Redhawk.
Some of the aperture rear inserts raise POI. In any case, look for a rear sight or insert that raises Point of Impact. My rule for rear sight elevation is that the ELEVATION SCREW maintain 3-threads of purchase at its highest adjustment.
Since your 50th Anniversary Blackhawk is blue, with silver soldered front sight, a pinned blade requires careful millwork. It would be easier to file a rear insert from sheet steel and get the exact notch proportions you want, and it would not permanently alter the original revolver.
The .125” Ruger insert has been made in a least two heights. You want the high. Many revolvers shipped with the low rear blade and .125” or .142” wide notch. Almost always, the higher rear blade is better.
*****
Ruger specifically soldered a tall front sight on the Vaquero----making the pistol shoot low----so that the owner could regulate POI to his or her load. Ruger at times would regulate a customer’s Vaquero----with factory ammo only----doing an excellent job.
Sight Adjustment Formula
As for your adjustable sight, measure SIGHT RADIUS with a caliper to calculate exactly via DISTANCE and DEFLECTION exactly how much you need to raise the plane of the rear blade to shoot Point of AIM. To calculate sight adjustment, multiply ERROR @ target x SIGHT RADIUS, a divide by DISTANCE to target. All measurements in inches.
Example:
* Sight Radius 6.5” x Error 3.2” = 20.8”.
* Distance to target 25 yards, or 900”.
* 20.8” divided by 900” = .023”
* Move rear sight .023-inch brings Point of Impact (POI) to Point of Aim (POA).
David Bradshaw
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Post by mhblaw on Mar 28, 2018 8:35:24 GMT -5
Thanks, Mr. Bradshaw, I hadn't thought of a higher rear sight blade.
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Post by cherokeetracker on Mar 28, 2018 9:06:55 GMT -5
Thank you David Bradshaw. Excellent advise as usual.
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Post by mhblaw on Mar 28, 2018 15:32:19 GMT -5
And, conversely, per Mr. Bradshaw's example one could file down the front sight by .023" ?
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Post by bradshaw on Mar 28, 2018 17:14:34 GMT -5
And, conversely, per Mr. Bradshaw's example one could file down the front sight by .023" ? ***** Please note the example I give to illustrate the formula for adjusting Point of Impact uses a hypothetical sight radius and POI offset. You must apply your own measurements. The formula takes the guesswork out of how much a sight must be moved to place POI on Point of Aim. Again, the formula: SIGHT RADIUS x ERROR, divided by DISTANCE to target equals necessary SIGHT ADJUSTMENT. Only you know the measurements required to calculate adjustment. SIGHT RADIUS, of course, measures the distance between AIMING SURFACE of front & rear sights. We are trying to eliminate abstraction from your sight adjustment, i.e., the regulation of your sights. David Bradshaw |
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Post by sixshot on Mar 29, 2018 14:23:37 GMT -5
I make them for the pinned Rugers & also S&W's (front sights) & I also make rear peeps for both Rugers & S&W's but as you know you have to break the screw on the S&W to remove the old sight. Yes, I have peeps on a couple of my guns depending on what I'm using them for. Grounds Squirrels don't seem to like them much!!
Dick
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