The A5 light twelve will only take the 2 3/4". They made a magnum version A5 that would take 3" shells but it will state that on the barrel and the receiver.
Thanks IU, a friend wanted an A5 to hunt with but wanted to use 3" shells and was told he couldn't. Didn't seem right to me so I inquired. Appreciate the answer.
Bought another A5 from the early '30s. Looks like a beautiful day out so we are going out to the field to shoot it and a Savage sxs that I bought for my son. Look out you wily orange bottomed pigeons....should be a fun afternoon!