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I am going to start shooting more sporting clays. I am looking at a Beretta A400 that has a 3.5" chamber and I'll always shoot 2.75" shotshells.
I can't imagine that would make any noticeable difference, but wondering anyway if there will be any problems with this.
Thanks
 

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Longer chamber is ok, too short is not. No problem shooting shorter shells in a longer chamber.

You may loose some velocity, but not enough to matter much.

Jason
 

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Isn’t that what lengthening forcing cones is all about or am I confused again?
 

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Howie, if you are looking at this gun but have not bought it yet I would question why you want it.

I have a 3.5 and in 25 years I have put maybe a single box of 3.5's down the pipe. Just not needed if you ask me. No more speed, no better ballistics, just more pellets and a huge increase in recoil to tear stuff up. The choice is yours but I doubt I'll ever feel outgunned with a 3".
 

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Unless I wanted it to duck hunt with steel shot I would pass. The gun is heavier and the action longer and it might not work well with target shells. I do not know about the patterning except to guess the long chamber will not improve patterns and might hurt them some.
 

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I use the earlier version, the A391 Extrema 3.5 inch chamber gun. It’s heavy but as long as it fits you well, will do just fine. I ended up buying a wenig stock to get a better fit. I do want to do a pattern test one of these days. Mostly to satisfy my curiosity whether the aftermarket choke I have does any better than the factory chokes.

Dual purpose gun. You can turn clays into smoke balls with target loads. Or knock down a getting the heck outta dodge Canada goose at 65 yards to complete the triple.
 

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Isn’t that what lengthening forcing cones is all about or am I confused again?
"Lengthening forcing cones" doesn't change the chamber length. Only the angle at which the chamber diameter transitions to the barrel diameter.
 
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"Lengthening forcing cones" doesn't change the chamber length. Only the angle at which the chamber diameter transitions to the barrel diameter.
No, but isn’t the effect almost the same? Shooting a 2-3/4 shell in a 3-1/2 chamber is not going to cause any problems as OP asked.
 

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No, not really.


Absolutely correct.
I have guns with lengthened forcing cones and some without. I can’t tell the difference between them. I guess my feeling about them is the same as others and porting.
 
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