Redline
You can modify the Domed Plug-this is the same one they sell for the Knight Revolution:
Part# 900043
http://www.knightrifles.com/productd...aspx?id=900043
Yes I drilled out the flash hole. I used the drill bit that just fits inside the nipple. Drilled out 5cm from the nipple towards the face of the plug. This ends up being about where the threads stop.
I use just CCI regular 209 primers, and it ignites every time

I use only
New red plastic jackets. The nipple on the domed plug is fatter than the standard plug, and makes an even tighter fit to control blow back
.