Okay I got some lubed .018" pillow ticking patches from Eastern Maine Shooting Supplies on the way. We will see what happens as far as loading, accuracy , and patch durability. With a .490" ball and .018" patch , I would think it should still load smoothly. Any reason not to keep using the .015" lubed patches just for plinking with the kids ?
IMO .018 will be tougher to start, .015 is standard.
Gently tapping it in with a mallet would help.
A long starter helps to tap it in deeper.
One can easily be made out of a thick piece of dowel from a home improvement store.
An almost bore size dowel can be made into a sturdy ramrod for a few bucks.
I only mention it in case your ranrod is flimsy.
Sure, you can keep using the Bloomer patches if you don't mind the fraying.
But I'd also recommnend getting some .015 patches because you won't know if the .018 will shoot as well.
Maybe you can add them to your order?
Call them in the morning if needed.
You'll want them down the road because your group size is pretty good for old eyes with open sights.
Some folks buy dry patches and lube them by hand to control the amount of lube and to keep them from drying out.
There's always an alternate way of doing things, and it's fun trying.