Lengthening chambers will devalue a collector condition Parker but there are some who believe for a shooter condition it won't matter much. If it were mine I would leave the chambers alone. Parker Bros. advertised the fact that they cut the chambers 1/8" short to provide for a better gas seal and in more recent times Sherman Bell and others have proven that such chambers only elevate the chamber pressure by 100 p.s.i. or so.
Again, if your chambers are 2 9/16" or 2 5/8" in length you are quite OK to shoot 2 3/4" ammo but don't shoot the heavy stuff. If your chambers are 2 1/2" you need to stick with 2 1/2" ammo.
Before you do anything else get a chamber depth gauge. Galazan's sells a very reliable one for a very fair price.
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