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PostPosted: Sun Feb 16, 2014 2:33 pm 
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Joined: Fri Jan 08, 2010 6:58 am
Posts: 887
Switch to a long Bolt probe on a .177 barrel LW. Now getting a notched feeling on loading pellets, especially wadcutters.
Think it needs to be "Letting", do not know of that is the right word for the meaning.
Removing the barrel and inserting a pellet, it stops at the start of the Rifling and needed an extra push.
Anyway, What size drill bit or reamer is to be used?
And how deep to go?
Would a size 16 drill bit, be the way to go?

Thanking all the machinist and Gear Heads.

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PostPosted: Sun Feb 16, 2014 3:58 pm 
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Joined: Thu Dec 05, 2013 11:49 pm
Posts: 132
Location: Winnipeg
Does it prevent you from loading and firing? How does it shoot? I'd cringe at taking a drill bit to open up the throat on a barrel. Nothing wrong with the pellet engraving when you close the bolt.


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PostPosted: Sun Feb 16, 2014 9:07 pm 
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Joined: Fri Jan 08, 2010 6:58 am
Posts: 887
Mr. TW.. Loads and fires great and groups "Single Holes at 11 Meters".
Pushing a pellet through, show no signs of any weird markings, just the normal rifling on the head and skirt of the pellet.
Just thought it should be more smoother.

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President and CEO of Procrastinator Unlimited.

Arsenal..
Kraft Marshmallow Pump and Shoot Rifle.
GoodYear Gatling Gun rubber-band shooter.
PEI Potato PCP Rifle.

Glass ..12" Dobsonian Reflector.
Shooting for the Stars.


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PostPosted: Sun Feb 16, 2014 9:19 pm 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8979
Location: Coalmont BC
I think the term you are looking for is a "leade" as in taper between the chamber and the rifling.... I use about 2* per side, and I make the chamber length such that the parallel section is about 1/16" past the front of the barrel port, then tapering in at 2* to the rifling.... When you chamber a pellet and then push it back out, the head of the pellet is engraved by the leade or rifling, but the skirt is not.... The chamber diameter should be about 0.001" larger than the head of the pellet, which means it will "size" the skirt slightly, leaving a shiny mark all the way around the skirt but not between the rifling lands on the head.... This insures that the pellet loads perfectly straight into the bore and that the head is started into the rifling before firing....

To accomplish the above, the best way is to make a custom chamber reamer of the profile you want from Drill Rod and then harden and temper it.... and before you ask, no I don't sell them.... However, Sean Pero can make you one, or can machine your barrel as described above....

Bob

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PostPosted: Mon Feb 17, 2014 4:14 am 
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Joined: Thu Dec 05, 2013 11:49 pm
Posts: 132
Location: Winnipeg
2240mod wrote:
Mr. TW.. Loads and fires great and groups "Single Holes at 11 Meters".
Pushing a pellet through, show no signs of any weird markings, just the normal rifling on the head and skirt of the pellet.
Just thought it should be more smoother.


Don't fix it if it isn't broke. Single holes is what we all seek!! There is a price for performance, and perhaps a little bit more effort loading is the price you pay for those groups. Would you trade smoother loading for bigger groups?


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