Have used 3 cans of "wipeout" and found it good but went to "Gunslick Foaming bore cleaner" because it worked just as good (and 1/2 the price) but had a better applicator.

A mate is using "Patchout" and has good things to say about it.

Also have a bottle of accelerator if you want it.

4" at what range.

There would be some DR that would out shoot some bolt guns but they would be the exception not the rule imo.

If you have a bolt gun like my 338-06 that shoots 1/2" it is easier to pick when fouled than a DR that starts off at 4".

I think DR guys have a different level of accuracy thats all.(not bagging DR as I know why and how they came about).

Before I get hung out to dry by other DR users I am only replying to 500's statement that fouling doesn't hurt big bores accuracy.