JM--
It is misnomer that modern firearms do not issue gunsmoke.
AI--
Several modern, readily available ammunition brands are known for producing more smoke at the gun range, often due to the use of "dirtier" burning powders or specialized coatings intended for high-volume, cost-effective target practice.
Based on user experiences, here are the primary brands and types of ammo that produce noticeable smoke:
1. Winchester White Box (WWB)
Frequently cited as the smokiest and "dirtiest" commonly available range ammunition, Winchester's bulk FMJ "white box" ammo often produces significant smoke and residue.
Reddit
Reddit
+2
2. CCI Blazer Brass
While generally considered reliable, Blazer Brass is frequently noted for burning a bit dirtier than premium ammo, resulting in a distinct, moderate amount of smoke at the range.
Reddit
Reddit
+1
---30---
In addition, if a gun barrel has recently been serviced, or oiled, the fresh oil will be emitted along with the gunblast, in the form of smoke.
Snub-nose .38s were known for their loud noise, and gunsmoke, as the short barrel did little to mitigate noise and smoke. In general, the longer the barrel, the less noise and smoke.
You are likely correct in deducing LHO's M-C carbine was not the source of gunsmoke smelled in the GK area, in the immediate aftermath of the JFKA.
The wind was blowing from the GK area towards the TSBD--you see that in women's apparel, skirts, etc.