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.
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.
Your colt police positive was made by colt in 1935.
Your colt police positive was made by colt in 1930.
.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.