I didn't have much success with the heavy plastic wads for steel shot and lead shot. Reference the "jug" post, using the cushion in the bottom of the plastic cup does help a little but not enough to make it worth while, if you put too thick of a cushion wad in the cup, the shot is at the top of the cup that opens too quickly. Also, as I said before, the steel wads do much better if you buy the longer ones made for excessively heavy shot charges in 3" hulls - shorten the shot cup by cutting off the petals, because most are normally tapered, they get thicker the closer you get to the bottom which helps keep them closed longer. Next problem is that the wad doesn't really stay with the shot long enough because it doesn't have enough mass - associated problem is getting flat or oval patterns. Watching someone shoot standing off to the side about 10 feet and slightly behind the shooter, you can see the wad yaw rather quickly after it leaves the muzzle, when it yaws, it pushes the shot still in the cup flattening out the pattern but the direction of the flattening is random. To cure the problem of the wad not staying with the shot long enough, I glued a fiber cushion to the bottom of the plastic, this adds mass to the wad so it runs with the shot for a little more distance and the extra drag on the back seemed to prevent yawing. I ran through a whole bag of wads trying different things and never saw enough benefit in the pattern quality to make using them worth the cost nor the trouble. BTW, the expensive special mega-magnum super duper whatever wads at about $0.40ea didn't work any better than the those from BPI that cost around $0.13ea.
I did try some solid (no petals) plastic cups from BPI, they did print better patterns from the straight cylinder bore, roughly between IC & Mod but a little closer to Mod. They do have to be shortened as well because as is all too common, they're made for overly excessive shot payloads. Again, problem is plastic fouling in the bore and just a side note about plastic fouling, no matter if you use a nitro card over the powder or not, plastic wads deposit plastic on the bore just from the friction and scrubbing against the steel. I don't care how well the bore is polished or not, 10 rounds through my super polished hard chrome lined SKB bore burning Alliant Green Dot and it's still plastic fouled - burning black powder just increases the difficulty of removal because of the higher heat. That's why I avoid using plastic wads in anything no matter what end it loads from or if it smokes or not. On top of that, I've yet to find a load combo using a plastic wad that can't be improved using card wads and paper shot cups. I cut my smoothbore teeth on smokeless and every new plastic gadget that came along ... until I picked up a huge lot of Alcan card wads, and ancient no-name single stage press and several hours of BTDT from the old fellow I purchased it all from.
Yes, split the fiber wads into thinner pieces, normally I mage three or four from a 0.500" thick, I made a little jig to split them into exact thicknesses for building wad columns in cartridges (save the cut-off's for use in the ML) Splitting the wad up also tends to improve the pattern a little even if you didn't have a problem with the wad blowing a doughnut. The TP (quilted/fluffy toilet paper) wadding works great, sounds stupid but it really works.
If you've got a jug or Tula bore, forget using anything but thin paper shot cups because the plastic wads & cups eliminate the choke effect. The very thin plastic wads will do okay but even those like the common AA/Rem/Fed trap/clays wads don't respond fast enough for the choke to be as effective as it can be.
J. Levy,
The wad(s) actually gain velocity after they clear the muzzle because they are not being held-back by the full weight of the shot. Once the shot is no longer contained by the barrel, the pellets are free to be pushed off to the sides by the wad that is being pushed by the muzzle blast. The gases that make-up the muzzle blast are also no longer being held-back by the payload weight so they are free to expend their energy at will venting from the bore. Keep in mind that the pressure in the bore is around 9,500 to 12,000psi, when the cork pops, all that pressure has to go somewhere. The compressed gas venting from the muzzle has a tremendous velocity as compared to the velocity of the shot, it's this velocity differential that creates enough mass to drive the wad faster after it clears the muzzle. This is why having a wide fairly deep crown is very important. Reference the other post: look at the old Steven's shotguns that looked like they used a Rigid pipe reamer to make the crown but the worked extremely well. Thus is why you will see high-end modern guns employing combinations of porting and muzzle flaring in an attempt to improve pattern performance - most of this is related to trying to counter the poor performance of the ammunition rather than the gun itself.
DP is right, you have to prevent the pellets from scrubbing off the bore as well as keep them from mashing against each other. Any deformation of the pellets, the less likely they will fly straight. I've tried many different buffing agents from the old stick-to-everything white plastic powder to powdered wood. I welded a handle on a 3/4" x 5" steel pipe nipple, measure out a shot charge, check the quality of the pellets before mixing them with the buffer and putting them into the pipe nipple. Cap the nipple and swing it like a hammer to give it one good solid whack on the anvil then dump out the shot and check it for damage. Kind of a crude experiment but it gives you some idea of what to expect in the fired round - really proves the point of how brittle pure bismuth pellets are.
Of all the sleeves/shot-cups I've tried, paper worked the best. As with plastic wads/shot-cups, if you've got a jug/Tula choke, if you make the sleeve too-thick, it'll defeat most of the usefulness of the choke. If you're running a cylinder bore, the thicker the sleeve and the more mass it has, the longer it'll stay with the shot and longer the effective pattern range will be.
Word of caution: In most places, using something like the wire mesh or other metal to make a shot-cup/retainer is illegal. It's a gray area according to the USA laws but generally swings to the black side leaving you facing federal firearms/ammunition charges as these fall into the same category as dart/flechette type loads even if you intend to use them in a muzzleloader, the projectile still falls under the heading of "ammunition" even if it's not a complete self-contained cartridge.
Now I'm going to comment yet again on the subject that just annoys the h*ll out of the "MEGA SUPER MAGNUM" guys! Sales hype & B.S. sums it up in a nutshell or should I say a "shotgun shell"? "More shot" does not mean "more performance"! I can't help but chuckle everytime I hear the suppository shooters claiming you need 2+ ounces of shot from a 3.5" MEGA MAGNUM for turkeys, ducks or geese. Jerry Lape touched on this so I know I'm not alone ... the heavier the payload, more than likely the less performance it'll produce. Here's a little example I like to post on the modern gun forums since they all like to focus on "numbers":
12ga, 26"bbl:
3.5" MAGNUM
2oz load
#6 shot
450 pellets
Pellet weight 1.95gr
MVmax 1150fps
Pellet energy at the muzzle 6.0ftlbs
Average 11 pellets definite fatal hits in turkey head/neck
Load efficiency 2.5%
Pellets wasted 439
Pellet energy at 30yds 4.0ftlbs
Standard 2.75" hull
1oz load
#6 shot
225 pellets
Pellet weight 1.95gr
MVmax 1390fps
Peller energy at the muzzle 8.0ftlbs
Average 11 pellets definite fatal hits in turkey head/neck
Load efficiency 5%
Pellets wasted 214
Pellet energy at 30yds 5.0ftlbs
It ain't how many pellets you throw, it's all about pattern control and velocity. Another HUGE thing that most people overlook is the shot string length (SSL). SSL isn't as much of an issue with a stationary target like a turkey but it becomes a major player in wing shooting. When you break the numbers down and look at the actual flight pattern of a shot cloud, those 2oz magnum loads normally have an average SSL exceeding 23 feet. Considering the fact that the pellets are not evenly distributed throughout the string length and the cross sectional area of an intended flying victim is extremely small, when you place the bird in the 3D graph of the shot string, the resultant number of pellets that will "possibly" strike fatal hits on the target is extremely low. Go to a 1oz load and you can effectively shrink the shot string length to less than 7 feet resulting in a disproportional increase in the pellets that will "possibly" strike fatal hits. Top the potential fatal hit increase off with each pellet maintaining higher velocity and thus higher energy potential and you can see where this goes. From an ethical hunting standpoint, not only do the lighter & faster loads produce far more effective and rapid terminal results but they also considerably reduce the number of ineffectively wounded birds that will not be recovered - normally a "miss" is a "clean miss" rather than a single pellet in the guts that will cause mortality at some point much later in time. Clays are NOT "live birds", two pellets can make a clay break look impressive, not so with a live bird.
One of the best performing loads I had was a 300gr (11/16oz) buffered 4/6 duplex shot load in the 20ga. I tuned the same basic load for use in a fowler and a suppository gun running both BP & smokeless cartridges. The fowler was done with a basic Tula choke and produced 70% patterns at 35yds. The suppository gun came with a "modified" standard constriction choke, I modified the bore and existing choke to a more advanced Tula style similar to what SKB used to use. At 25yds, 100% of the pattern would print into 8", 15" at 35yds and 30" at 45yds. In that same gun I worked loads up to 1.375oz, the 7/8oz loads maintained very similar patterning but going up in payload weight from there would not increase effective pellet count, all the additional payload weight did was reduce velocity and increase the shot string length further reducing the effectiveness.
I'll admit, in the 80's I got suckered into the MEGA MAGNUM hype but not for long, once I started testing loads, it didn't take long to see what worked and what was B.S. sales hype. In a shotgun, no matter what the type or propellant, velocity is as important to effective range as pattern quality. Give up either one and you give up effective range. Another thing is that going with a bigger diameter bore doesn't mean you're going to get a more effective pattern. It doesn't matter if you use a 8ga or a 28ga, if both are using a load capable of putting the same 10 known-fatal pellets into the neck/head of a turkey with each pellet carrying at least 3.2ftlbs of energy at the time of impact...what's the difference? If you're 8ga is only producing a load efficiency of 2.8% how can anyone make a credible argument that it's somehow better than a 28ga that's producing 7.5% load efficiency? Same question applies to velocity of the load - how can a credible argument be waged when the most velocity you can put on a 2.5oz load of shot is 1060fps as opposed to 1400fps on a 7/8oz load - given the same pellet size, it becomes quite clear that those impacting at a considerably higher velocity will be considerably more effective.