Yes, but it opens up Pandora's Box on using smokeless in those not VP proofed as I see here.
Old adage was anything past serial number 192000 was safe with smokeless. Other than the fact Colt didn't start proof stamping guns till around 1906.

If you cna show me a VP gun prior to 1906 that is not a rebuild please do. Shooting the thin walled 45s with smokeless at your own peril (and the gun's) if it isn't VP proof marked. But then Colt would also proof marked older guns at times, built prior to 1900, if they were being rebuilt at the factory. Any number those around and almost always in 45.
I shoot a few early 1900 Colts with smokeless but none of them in 45 Colt. 44wcf, 38wcf and 32wcf all shoot a lighter bullet and have more steel in the cylinders. It helps. They are the better bet if you want to shoot smokeless in a gun built after 1900 and prior to a VP, proof stamp.
Guns shown (left top to bottom and then right top to bottom) are a 1892, 1899, 1900, 1901,1902, 1904, 1909, 1912. Calibers are .32 WCF. 38wcf, .41 Colt, 44wcf, 45 Colt. Grips range from old ivory, old and new pearl, old bone, new wood and Colt hard rubber.
