My ignorance of smokeless shows but since I never have and never will use the evil white powder in front stuffers , you can laugh but I hear muzzle loader and think of 12-1300 FPS Black powder. I will refrain from commenting in the future and let you find your entertainment elsewhere, what I stated is absolutely true relative to cast Sabot and wad
The thread starter specifically stated that he was asking this question concerning smokeless powder. Additionally, this is the smokeless muzzleloading section of this board. Why are you here? Are you lost? This isn’t the traditional section of this board.
Wads do 2 things:
1) With a round ball, people shooting really hot loads (of course this is smoky powder) would often fold a patch in 4ths and put under the patched RB. This helped in not burning thru the actual patch around the ball. Later, a wool was (All Day Wonder Wad was used most at Friendship) was substituted for the folded wad.
In the early days of Savage 10ML, later ML2, sabots would fail due to heat or just inability to handle the load. Wool wads helped. Today, with the usage of 45 cal retrofits and so many custom 45s, hot loads with the Light Blue Harvester sabots (HLBS) are often used . The hotter the powder, the greater the chance of failure. A 200SST, 195 Barnes, a sized 225/228g AccuMax, Fury - various, etc can be shot to 2600’/sec with just VV110 up to 2600’/sec if a wool wad is used TO PROTECT THE SABOT BASE. Likewise, other loads can be used (slower powders usually in a duplex) can be used for up thru 3100’/sec.
2) Sabotless. The wad is a bandaid . It helps seal the load, helping with obturation, when the bullet won’t obturate easily due to bullet sizing, bullet composition, a light load, slow pressure rise or a combination of any of these.
Personally, I only shoot sabotless 40s now. Some of my loads don’t have enough initial pressure to obturate quickly enough to obturate ideally so I use a wad to help.
Wads have their place in smokeless muzzleloading. Ideally, they aren’t needed; but, sometimes they are just the right answer.