For 204 I use a 17cal Montana X-treme jag that allows a back and forth motion due to its opposing ridges. Its backend diameter (where it meets the rod) just happens to be the exact same as my Proshot 17cal rod. Nice and smooth interface.
Using Hoppe’s #9, the first few patches I push through just once out the muzzle as I want the really dirty deposits out and not rubbed around. After 2-3 patches I then go to the back and forth method as it really shortens my cleaning time vs using “one-patch-one-pass” typical method. I can also concentrate on the throat area this way.
- Rod: Proshot 17cal SS
- Jag: Montana X-treme brass 17cal
- Patches:
- ★ Proshot 1 1/8” square – initial use when dirty
- ★ Proshot 1 3/8” square – use after above; tight but allows back/forth motion
I own the Montana 204 jag as well, which is the same backend diameter as their 17cal jag, so it would be used on my Proshot 17cal rod for the same reason. I found that with the 204 jag and Proshot 1” round patches that I’d get some quite tight pushes and some not…must be my lot of patches?
So I just use the 17cal solution. The longer patches cover more of the jag’s ridges anyhow, which makes me a little less concerned for the bore/crown and accidental contact.
The jag I use, below:
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