I import and Distribute Wipe Out Patch Out so have boxes of it thanks.

Re the foam, it is easier to use a tube to insert it from the breech end.

"4" at what range" The target is 4" (a red circle of 4"), the DR regulates better than that.

"There would be some DR that would out shoot some bolt guns but they would be the exception not the rule imo."
Agreed. I have a couple that are deadly accurate.

Not sure on different levels of accuracy, I expect and get my guns to shoot but 2 barrels is harder than one, especially open sighted.

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