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Old December 1, 1999, 07:41 PM   #26
Join Date: October 29, 1999
Location: Barbados
Posts: 28

If you can, find a 4'x4' piece of 1/2" ply, mark a black dot in the center, retreat about 25yds, aim at the dot and shoot it (with #8 or #9 bird shot).

With your cylinder barrel, you may cover most or even all of the wood with your shot pattern. Inspect the pattern carefully. There will be some clear patches with few or no shot (holes, suprisingly big too, eh!) and towards the outside edges of the pattern there will be stray shot.

Lengthening the forcing cone is supposed to clean this up and to regularize the pattern. When the crimp at the end of a cartridge opens in the chamber, the shot then travels through the forcing cone, where it gets somewhat compressed as it enters the barrel. By lengthening the forcing cone, you are slowing the compression of the shot. This reduces deformity in the individual pellets and to some extent smooths out the progress of the shot and the wad (which is pushing the shot) down the barrel. As a result of this and less deformities, the shot flies truer, therefore the pattern is better. It is not tighter, but it should not have as many holes in it or as many stray shot.

If you need a tighter pattern, you have to get chokes, its as simple as that.

To throw a little spanner into the works, most modern, plastic shotgun wads rotate somewhat in a smooth barrel (not nearly like rifling, though). Shot emerges from the barrel spinning. Further the individual pellets travel down range at slightly different velocities creating whats called a shot string or trailing shot. Therefore, when a shot fired at a piece of plywood 25 - 30 yds. downrange meets up with the stationary, solid, vertical plane, the pellets will strike it over a period of time. So, is the pattern left on the board, representative of the quality of pattern thrown by your gun with a specific cartridge.

Talking about fishing, these lures are getting very expensive and won't make a bit of difference to the guy casting flies, for bass, in a sport fisherman, off the coast of Florida.

Blue Bunny, keep on posting. I like it.

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Old December 2, 1999, 12:46 AM   #27
Blue Jays
Senior Member
Join Date: May 21, 1999
Location: United States
Posts: 358
Hi Everyone-

What do you all think is the effect on durability of the shotgun? Is enough material removed when making these modifications that the firearm will have a shortened lifespan? Just curious of your thoughts.


~ Blue Jays ~
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Old December 2, 1999, 04:02 AM   #28
Join Date: September 13, 1999
Posts: 95
CMOS another factor you need to take into consideration is that your 870 Marine Magnum is hard chromed inside the barrel as well as outside. If you have any work done to the barrel you are going to loose part of if not all the corrosion resistance you paid the extra money for.

Also you need to let whomever you choose to do the work for you know that it is a chrome lined bore as some will not have the special reamers needed to cut through the hard chrome lining.

Another thing is that if you have any work done to the barrel there is a chance of the chrome lining peeling as there isn't a total coverage of chroming after the work.

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Old December 2, 1999, 05:52 AM   #29
Dave McC
Staff In Memoriam
Join Date: October 13, 1999
Location: Columbia, Md, USA
Posts: 8,812
Blue Jays, Greg will not do aftermarket backboring, he dislikes taking bbl metal away. He does do forcing cones,so it must not matter there, where the metal's thickest.

I'm not shooting as much as I used to, probably only a thousand rounds or so through the bbl that's been modified the longest. I fully expect the weapons to outlast me by several generations...
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Old December 2, 1999, 01:28 PM   #30
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Join Date: June 10, 1999
Location: TEXAS
Posts: 1,417
Good comments guys.

Thanks Beano.

Woody, are you sure that inside of the barrel is chrome lined? It sure doesn't look like it. I mean it doesn't look anything like my Benelli barrel. How can I confirm this?


GOA, TSRA, LEAA, NRA, SAF and I vote!

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Old December 6, 1999, 05:46 AM   #31
Dave McC
Staff In Memoriam
Join Date: October 13, 1999
Location: Columbia, Md, USA
Posts: 8,812
Sorry,CMOS, it took a while to find the info,

Greg Wolf 410-820-8811 Days
410-673-7323 Eves

Hope this helps...
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