Kurt's recovered bullets

[Kurt]

Kurt, that picture of those recovered bullets you have showing some paper caught on the base and the fold still in the hollow.
Do you suppose that part of that may of been from the hollow base actually pinching /trapping the paper?.
Could this maybe have been prevented by not completely closing the paper in to the center of the bullet?

Have you found any solid base bullets showing the same problem?

Just questions that popped up after seeing that picture.
Great big thanks to you for sharing those with everyone.

Don.

Those bullets are from Rick Mulhern he sent me to see what was going on because the trouble he was having with them. I used that photo because it was in the bucket files.
After I picked those up when the snow melted I did a bunch the next winter to further look into this because I had the same thought like you mentioned so I shot a bunch (130) the following winter with the cup based and flat based bullets folded under like the Hyde and twisted or just folded covering the base. I found more with the cup base than the flat base but it made no difference if they were like the Hyde or completely covering the cup or flat base. I found paper in betted in the shank like you saw in the photo. It was always with a wet bore.
When I shot Ricks bullets I thought it was the deep cup with a thin skirt that pushed the under bore diameter bullet forward causing this and to this day I still think that what happen in this case because those particular bullets had a .49237" diameter and a .082 deep thin skirt cupped base.