Im shooting nothing but BH209 in my X7. The only bad thing with this is the breechplug is a bear to get clean. Im wondering if the breechplug is wiped down with silicone spray, it would be easier to clean.

I use Hoppes to clean the breech plug and the fouling comes off without a problem. I did buy the small brush that TC sells to clean the interior of the plug.

If you use a 1/8 inch drill to clean the 1/8 inch hole below the 209 seat and a 50/50 mix of alk. and Hoppes #9 to clean every thing else you should not have any problem. Oil well after cleaning preferably with Birchwood Casey Synthetic oil it does not cause tar residue like some. Lee