I guess only high speed photography that can make out gas flow - sorry I don't remember how it's done, but the Cardews did it - will show what is going on and the differences between a near flat muzzle end, and the cone you have created.
Theoretically the cone shape will allow air from around the muzzle to flow more easily in the direction of the muzzle blast - the blast itself is high pressure but flowing forwards it will create a low pressure zone around it just as it exits and should "pull" surrounding air - the cone ought to make it easier for this to happen, so the blast ought to be somewhat smoother. But it's also a question of time - if the blast were a continuous flow that's one thing, but since it is not, there may not be enough time for any of this to happen meaningfully - the pellet may well already be several metres from the muzzle by then.
One of those things where you either need specialised equipment to understand what is happening, or you just compare end results and conclude that something is or is not working, even though you may not understand exactly why.
Last edited by air-tech; 16-03-2018 at 06:03 PM.
Reason: Shoddy writing :)
**WANTED**: WEBLEY PATRIOT MUZZLE END; Any Diana/Original mod.50 parts, especially OPEN SIGHTS