Unless Ernie got a new 17 he was using a 17rem in the CZ configuration...
I have a fox hunting from from the UK.. He told me the same thing about his 22250. All of a sudden it starts shooting all over the paper and that's when a simple cleaning brings it back to zero..
I also just read recently in Hornady annual reloading magazine about the CFE powder..Copper Fouling Eliminator. That is actually a clean burning powder... They have reloading info in the magazine for the `17 Rem but not yet for the 17 Fireball using the CFE powder... The CFE powder can be used from 17 Rem up through .375 H & H calibers... However it didn't show any for the 22 Hornet... it did show a reload for 204, 222, however and 22250 etc..
This Hornady magazine comes out every Jan and is filled with all kind of good articles and new reloading data on all the new calibers. However it does tell the store to remove it from the racks on 18 March. I get mine in the Barnes and Noble book store. For example it list the following powders all ready for the 17 Hornet:
H4198
IMR 4227
296
H110
LilGun
H335
H322
This CFE can finally stop the bad mouthing by gun writers on how bad the 17 REM fouls up barrels. what really bothers me is when these sports writers say.. "I Don't Really Own a 17 Rem but!!!!!!" Watch for statements like that on some of the gun pros in the past... They never owned a 17 Rem but pass judgement on it...
I really like the IMR 8208 XBR powder... Wow that shoots so well in the 17 Fireball, 17 Rem, 223, and the 22250... It's also a powder that can be used for all kinds of calibers... I will be checking this Hodgdon CFE powder out...