Shroud alignment tool
I have wondered if anyone has created a tool to make sure their shroud is aligned perfectly with the bore ?
I have found that if there is some mis-alignment then the small exit hole will actually have the air compressed on the near side as the pellet passes by and cause the pellet to be pushed ever so slightly to the opposite direction.
I did get a 12 inch long 3/16 brass tube from the hobby shop and wrapped one wrap of heavy material tape (similar to the thickness of gorilla tape) and ended up with .243 OD. This is a snug fit and should not damage the rifling at all.
I push the tool in about 3 inches into the muzzle and have the last few inches showing to determine how mis-aligned the shroud is.
Curious if anyone knows the ID of the rifling on a 25 caliber Condor barrel ?
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Does anyone have the ID of the rifling themselves ?
I have a .25 barrel that I got from Walt some time back and its a .251
One thing to keep in mind with the shrouds, is to index them really makes things much easier to use everyday if you shoot often and actually use the rifle somewhat. Bumps and dings happen from time to time, heck I have even fell off some rocks once and fell out of a tree another time, both times with rifle in hand…
You got to make things useful guys, unless you like a fairy tail world and lucky enough to live in one LOL… Then there is always the time and place I up’d the power on my Condor and launched the shroud as a projectile, never a good thing either LOL…
Point here is to index the shroud and make sure you use more than one set screw. I don’t even use set screws anymore on these, I have mine drilled through and tapped one in the top of the frame and one in the bottom. This really gets the shroud anchored and indexed.
You can actually use the push off from the shroud on the projectile to your advantage also, it can be used to help zero in your POA. With the scopes being mounted so high on these sorts of rifles, you can find yourself way out of adjustment to zero, still have enough adjustment left to do mil-dotting and range shooting with the scope… You really want to shim scopes to sight them in as close as possible, leaving all the scopes internal adjustment to hunt and range shoot with. Least I do…
So shooting the shroud and plot how it affects the projectile with its push and tuck before actually installing the final index in the shroud can really help with scope alignment. making two points as I have one top and one on the bottom of the rail allows you to be able to rotate the shroud, so another index mark will have your top and bottom placed.
This has worked well for me anyway, not to mention it was fun turning the shroud on the frame and shooting to see the change in the POI…
Thanks – I do use a FrameExtender Shroud, that is extra long and extends 12 1/2″ beyond the frame. The exit hole is .288, which is (.288 – .250) / 2 = .019 clearance, so yes a slight shift can offset the hole, so even if the pellet never touches the side, it still is compressing air more on one side than another.
Ive had better luck using my eyes. Tank off, peer thru barrel from breech end and point it at a white sheet of paper on your wall. The method is similar to checking for parallax, but this time your seeing if the overlap (some call it shadowing) is consistent.
I use .281″ for .22cal, and .300ish for .25cal and have no shroud issues or curious neighbors.
Yes .281″ works with .25 cal too but it is less forgiving in the field. Bump a tree hard enough and you may be down for a few minutes.
If its built right it should line up perfect with the barrel.
I have slugged my barrel for the purpose of cast bullets.
It measured .2549. It is of the lastest batch of LW barrels.
Marvin has a earlier barrel that is closer to .251.
Regards,
Roachcreek
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And on top of that, almost every bore in these barrels is not exactly centered so I don’t know if that makes any difference in pellet coming out of the end hole with one side having bigger gap then the other.
Also, it is just my opinion and I might be wrong, but if shroud has baffles, then by the time the pellet leaves it, the pressure is very low and most of the air is probably still behind the pellet so, I never had problems with pellet coming out not being exactly centered. But if there is clipping, then there is a problem.