Lengthening forcing cone

[Ray Masciarella]

There is much dicussion about lengthening forcing cones. Some say it is great, others say it does nothing. IMO, it is like hunting for Bigfoot-you might not find him but it doesn't hurt to look.

Here is my question: does anybody out there of any real study/testing showing the actual effect of doing it. Not I'm looking for any mere opinions but an actual study.

Thx, Ray

[charlie cleveland]

hope you get some anwsers on this one ray...this is a good question.... charlie

[John Campbell]

The major issue in lengthened forcing cones in double guns is the removal of metal where pressures are highest. If lengthening takes too much metal out of the barrel, it's bad. If there is enough to maintain safety, then a longer cone will generally lower pressures.

The Parker site's FAQs has a very valid discussion of this under the topic of barrel thickness.

Best, Kensal

[Gerald Majors]

Go to Rob Roberts Custom Gun works at [url]www.robrobertsgunworks.com or call him (He's a real talker) he is usually happy to talk with you. He has done a lot of research on forcing cones, back boring and porting. It may not be in a published form but he has the numbers.
Gerald

[Ray Masciarella]

No doubt it lowers pressure and can be a problem if too much is removed from the barrel.

Rob Roberts lengthened the forcing cone on one of my turkey guns. After trying many chokes, it shoots an unbelievable patterns. I know the chokes made a difference. I'm not sure the forcing cone work made any difference. I tend to think it did not tho it caused no harm.