DT (Mr. Chisels) shows in his humorous post the fallacy of worrying much about the exact length of chambers on guns of normal chamber length. He sure isn't going to get caught worrying about 1/4 inch of plastic. The difference of length in a 2 1/2 inch chamber and a 2 3/4 inch chamber is 1/4 inch. I would guess that the first 1/4 inch of most forcing cones only shows thousandths in decreased diameter, maybe less than the variation in two different chambers. Sherman Bell's articles explaining such things brings us to the conclusion that there is very little pressure difference, if any, in 1/4 inch shorter chambers when shooting normal ammunition.
