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Post by Lee Martin on Sept 20, 2016 19:33:32 GMT -5
Charles - heat shields absolutely help reduce mirage. They do so by deflecting barrel heat away from the objective. But you'll want an up curved shield:  My PPC wears one all the time:   These shields can't overcome the atmosphere, but they'll slough some of the near field distortion...meaning barrel heat. -Lee www.singleactions.com"Chasing perfection five shots at a time" |
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Post by cherokeetracker on Sept 20, 2016 20:33:19 GMT -5
My apologies Lee,, I now remember seeing this photo from before. I have to add, that the drawings, and explanation, are highly effective. I now have a better understanding of this. From the photo I could not tell that the curve was in an upward position. To me it looked flat. That is why I suggested a venation blind that was curved. Leave it to me to put the things on upside down. Also, I like the Velcro instead of double sided tape. As long as it will hold in a Wyoming wind, I will be fine. Hopefully you never had a shield vibrate and sing to you during a windy day.
That's why I keep coming back to this thread,,, I keep learning from it. I appreciate the photos and the wealth of info. Thanks.
Charles
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Post by 2 Dogs on Sept 20, 2016 22:15:35 GMT -5
Two hundred two THOUSAND views.
You guys are a bunch of closet riflemen!!!!
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Post by Lee Martin on Sept 20, 2016 23:02:59 GMT -5
Not exactly Fermin. On two occasions this thread got picked up by a web bot. Each time the count spiked by 40,000 - 60,000. And those are the times I noticed it. If I had to guess the probable count is well under 100K. But it really doesn't matter...what's in a number? -Lee www.singleactions.com "Chasing perfection five shots at a time" |
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Post by kings6 on Sept 20, 2016 23:26:11 GMT -5
Thankfully at my age, the answer to "what's in a number" is NOT MUCH! =  |
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Post by 2 Dogs on Sept 21, 2016 13:39:23 GMT -5
Not exactly Fermin. On two occasions this thread got picked up by a web bot. Each time the count spiked by 40,000 - 60,000. And those are the times I noticed it. If I had to guess the probable count is well under 100K. But it really doesn't matter...what's in a number? -Lee www.singleactions.com "Chasing perfection five shots at a time" Still, it has been a grand thread! |
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Post by bradshaw on Sept 21, 2016 14:20:16 GMT -5
Charles - heat shields absolutely help reduce mirage. They do so by deflecting barrel heat away from the objective. But you'll want an up curved shield: My PPC wears one all the time: These shields can't overcome the atmosphere, but they'll slough some of the near field distortion...meaning barrel heat. -Lee www.singleactions.com"Chasing perfection five shots at a time" *** Lee... fine HEAT WAVE graphic. How about a drawing of heat rise when scope is over barrel----without a shield? In shooting silhouettes in high summer heat on an uncovered firing line, mirage could warp the visual of iron sights, revolver, production single shot, and unlimited gun alike. Humidity aggravates the condition. A breeze may wipe your sights clean, providing a better view of the targets. Distance amplifies mirage, with turkeys @ 164 yards and rams @ 220 yards particularly rough in a boil. Chickens @ 55 yards and pigs @ 110 yards are generally immune to visual displacement. Although the pig sets the roadmap for multiplying wind drift on turkeys and rams, mirage must be read from 2/3 to full distance to target. This foreground in front of the target also a good focal distance for seeing the bullet. (The rifle spotter looks for a vapor trail.) Great work, Lee, David Bradshaw |
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Post by Lee Martin on Sept 21, 2016 19:24:04 GMT -5
David - below is a depiction of unshielded barrel heat. Note there is no crosswind in this scenario. If there were you'd also have horizontal image dispersion:  -Lee www.singleactions.com"Chasing perfection five shots at a time" |
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Post by cherokeetracker on Sept 21, 2016 20:34:22 GMT -5
Two hundred two THOUSAND views. You guys are a bunch of closet riflemen!!!! What the hell does this mean?? |
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Post by 2 Dogs on Sept 21, 2016 21:03:15 GMT -5
Two hundred two THOUSAND views. You guys are a bunch of closet riflemen!!!! What the hell does this mean?? Try this: Perhaps some guys like rifles more than sixguns. |
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Post by Lee Martin on Sept 22, 2016 20:08:52 GMT -5
Barrel Number Two __________________________ Time to pull barrel number 1. It is still passable in competition, as shown by a recent 250 VFS. But with 1,879 rounds down the bore, it’s fading. Aggs are creeping up, X’s are dropping. I fire-formed fifty new cases last Saturday in preparation for Shilen #2. We’ll now shelve this tube and use it for fire-forming. I may even set it back and re-crown the muzzle. If I have a blank fall flat, I can resort to Shilen #1 in a pinch. RIP - May 2015 to September 2016. Service = 1,879  With the gun apart, I performed some routine maintenance. Brake cleaner was used to thoroughly wash the inside of the receiver. It was also sprayed into the trigger to flush grit or residue. Never use grease, oil, or Teflon based lubricants. These are notorious for trapping dirt and gumming up the internals. Lighter fluid is another acceptable solvent.  Dad machined the first barrel, I get to do all subsequent chamberings. I just indexed Shilen #2 in our South Bend Heavy 10 (7 contour, 13.5 twist):  I’ll get it installed next week and tuned that Saturday. The following weekend is the IBS Virginia State Championship. New brass, new barrel...and little time to get them synched. Another side-project is we’re clear coating my stock. A year ago we shot it in single-stage urethane. It turned out nice, but I want added protection. That’ll come by way of 400 grit, a heavy coat of color, wet-sanding, four coats of clear, and finished with 800 grit wet sanding. -Lee www.singleactions.com"Chasing perfection five shots at a time" |
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cmillard
.375 Atomic
MOLON LABE
Posts: 1,989
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Post by cmillard on Sept 23, 2016 7:25:26 GMT -5
that barrel lived a good life.
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Post by Rimfire69 on Sept 23, 2016 7:40:43 GMT -5
Is the other end of the barrel supported, or hanging free. I have been wondering about rigging up a collet on the back side of the working hole to support barrels long enough to stick out the back. Is there any need?
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Post by Lee Martin on Sept 26, 2016 19:05:51 GMT -5
Is the other end of the barrel supported, or hanging free. I have been wondering about rigging up a collet on the back side of the working hole to support barrels long enough to stick out the back. Is there any need? The muzzle is supported in a home-made spider. We indicate off both the outside diameter and inner bore.  -Lee www.singleactions.com"Chasing perfection five shots at a time" |
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Post by Rimfire69 on Sept 27, 2016 6:23:26 GMT -5
I see, thank you. The spider or cat head would have adjustment, the collet I thought about would not, good idea.
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