Change musket caps; change point of impact?

[Naphtali]

I have been shooting Navy Arms Brazilian-manufactured winged musket caps I bought circa 2000. I'm on my last 250-cap tin for target shooting and, recently, in my double rifle.

Those of you who have changed musket cap brands - I specifically exclude CCI's reenactor's caps - if I buy-use RWS winged musket caps, will there be a significant change in point of impact? Double rifle's regulation concerns me more than the target rifle.

[Scott Kurki, 12475]

You can pretty much count on a change in point of impact any time you change anything, even powder lots. Your best bet is to head to the range and find out. It should be a fun activity.