Happy to do so. I only wish Jim visited the site often enough to answer this himself.
He uses only OS cards in his 20 gauge fowler.
The powder goes in first, of course, followed by 4 OS Cards. He puts a lump of grease between the 3rd and 4th cards, to lube the barrel. Then goes in the shot, followed by 2 OS Cards.
All his OS cards have off-center hole punched into them with an awl. This lets air out so it doesn't burst the sides, or edges of the cards, and destroy the SEAL, which is why he is using the cards ( or others use wads) in the first place. The cards are loaded so that NONE of the 4 holes line up with the ones around it. A simple !2,3,6 & 9 o'clock positioning of the 4 wads does the job.
The first four cards can be run down the barrel together. Air behind the cards will filter through the powder and out the vent hole. But once the 4 cards are in place, air becomes trapped between them, and the 2 cards that come over the shot( "OS" cards). Line the two OS cards at 12 and 6 o'clock positions, and they will go down the barrel easily and let the air escape out the hole in each of them, stopping "dieseling".
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I have changed his approach to this loading by SKIPPING the ball of wax/grease between the 3rd and 4th cards over the powder, and instead, I use a lubed cleaning patch in front of my jag, when I drive down the 2 Over Shot Cards on top of the shot. The cleaning patch comes back out, and I have greased the entire bore in front of the shot load.
Benefits of my approach:
1. The barrel is protected from rusting on a hunt.
2. The greased bore lets the SHOT SLIDE over the barrel, rather than rubbing lead OFF ONTO the barrel. The absense or reduction of lead streaks keeps the pellets round, and improves both the Number of pellets in the pattern, and the Shape of the pattern.
3. The lubed barrel still softens the fowling for easy cleaning.
4. The lube in the barrel "feeds" the patch of a PRB when I choose to load that instead of shot, helping to keep the patch full of lube as the PRB exits the barrel.
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I am not trying to change anyone's mind, nor criticizing Jim's way of doing things. I am sure it works, as well as using the more traditional "lubed" cushion wad. Jim's method gets the OS cards to drop away from the line of fire quickly, so that the wads are not bumping the back of the shot when all leave the muzzle, causing " donut " hole patterns.
The ONLY difference in his technique and my modification is that my way helps to eliminate lead deposits in the bore, rust in the barrel on long hunts in bad weather, and the affect on pattern shape from lead streaks in the bore.
Both ways eliminate the donut hole patterns that occur when the wads used over the powder are too heavy, and tend to follow the shot column to at least 25 yards( I have seen the holes in my paper patterning targets).
The last time I was shooting my shotgun before Jim posted his technique here more than 2 years ago, I was splitting those cushion wads in 3s, and using only a third of the cushion wad to try to stop the donut hole patterns.
I had not yet figured out how to end the lead streaks, and how they cause subsequent deterioration of patterns. I was actually keeping a second Range Rod at the loading bench with a Bore Brush on it, and Hoppe's Lead solvent, to scrub out the lead deposits between relays.
That is more work than what I am doing now with lubing the barrel after seating the last 2 OS Card.
Sometimes, the KISS principle works.
In this case, Iron Jim Rackham hit a home run by reducing the number of wads you have to take into the field. When you are only able to shoot 2 pheasants a day, carrying several different wads is not much of a burden. But, if you want to take your gun out to shoot dove, with a 15 bird per day bag limit, and a bird well known for being able to turn on a dime, and give back 9 cents in change, you should expect to need LOTS of Cards, lots of shot, and lots of powder. The National average for dove hunters using modern guns is 7 shots fired for every bird killed. Now go out and take that bag limit with a flintlock!
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