I've used 1/16 LDPE wads for 30 years with BP and smokeless but, I've never used wool felt.
The LDPE does protect the base of a from the peening that BP exerts on it and I'm sure that wool felt would also help protect the base, also. Recovered LDPE wads showed heavy peening so, I always use them in that application to protect the bullet base.
I've also used LDPE in the case mouth with smokeless to keep the powder from spilling, instead of floral foam. Another application was to insolate the bullet base to keep from gas cutting in higher velocity uses.
I too, talked to John, back when he posted on this forum, regarding BSing wads on the back of the bullet , causing the bullet to be 1/16 farther forward in the barrel with the wad behind it. I haven't found any marked increase in accuracy, accept with BP. I didn't use cork or fiber, just LDPE in my applications so, I can't say that wool would have the same effect but, if the improved chrono results are a result of better sealing of the base, LDPE would be at least as good, if not better in sealing the bore. I also didn't play with the BSing depth in that testing. Note that my LDPE wads are cut with a punch and die (.323 & .3115 - 32 & 30 cal), to insure sealing the barrel and case mouth.
The word "consumed" can have more than one meaning but, in this application it's NOT refering to being burned at 212F. The ignition temp for wool is 1112F.
I also found in my search that wool is abrasive and when highly compressed, it's used in metal removal (grinding/polishing wheels). The fibers have barb like surfaces and that's why it doesn't have to be weaved to make it into a fabric.
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