I don't have a 470 so you're more informed than I. I'm just trying to help him from the book.

Now if it were 577/500BPE or 500 3" BPE or 500/450NE or 450 NE then I could help more with a partuicular cartridge.
I've been playing with foam backer rod from Cheapo Depot instead of the $pendy Knyoch foam plugs with good sucess.


"When you see that in order to produce, you need to obtain permission from men who produce nothing; when you see that money is flowing to those who deal not in goods, but in favors; you may know that your society is doomed." Ayn Rand