Model 37's of that era don't work well with reloads. The problem is the mag tube is too tight, and reloads with even slightly enlarged rims will stick in it. If you only shoot factory loads this is not a problem. If you want to shoot reloads there are two fixes. 1) only reload cases 3 or 4 times then discard them. 2) remove the mag tube and have someone polish it out about .005. The polish can be done with a flap of emery cloth on a split mandrel spun with a hand drill(a piece of drill rod or cold roll split with a hacksaw to hold the emery cloth,180-220 grit) The worst choke point is where the tube screws into the reciever. I've done several of these and the fix worked perfectly.
while working at a gunshop about a decade ago, a customer came in bragging about his five shot semiauto, and how it can out fire a pump. well, my father took the 37 off the rack, loaded eight rounds into the magazine, and offered the customer to come out back to the range. there they made a wager, first one empty gets $20.
my father fired all eight rounds before the customer was on his fourth.
the Ithica 37 is my personal favorite shotgun. simply because of the disconnect. if it had a detachable magazine, it would be the best shotgun in the world.
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