it's possible your colt was made for 38 S&W cartridge. that cartridge is smaller in length than the 38 special cartridge. try fitting a 38 S&W cartridge.......
38 caliber revolver ammo
A Colt police positive ,32 with that serial number was made in 1909.As far as ammo,you can check with any gun shop.
.38 special Stay away from the "+P" ammo
Gun shops, gun shows, on line, pawn shop,
You need a good gunsmith.
Depends on which police positive with sn 134551: Colt police positive special -1916 Colt police positive .32-1916 Colt police positive .38-1921
Colt police positive .38 was made in 1919 and Colt police positive special was made in 1914.
Your colt police positive was made by colt in 1935.
Your colt police positive was made by colt in 1930.
It depends on the model: Colt police positive .38 was made in 1917, Colt police positive special was made in 1914, Colt police positive .32 & target was made in 1912.
.32 S&W Long If that doesn't work you will need to compare the serial number and figure out the manufacturing year, there were minor variations depending on which decade it was made; and of course there are a handful with aftermarket modifications. But the 'police CTG' models should have no trouble using .32 S&W Long. It should also be interchangeable with other ammo of the same size such as: .32 Colt New Police .32 Colt Police Positive
A Colt police positive .38 and a Colt police positive special with that serial number were both made in 1913.