You may want to call CVA and ask them about shooting conicals over 400gr. Their response may not be what you expect.
CVA manual http://www.cva.com/pdf/AccuraV2%20Rifle%20Manual%20Form%20107V2%28Rev%202-13%29.pdf
LEAD CONICALS
Do not use lead conical bullets weighing over 400 grains in your CVA rifle
White 504s have a 1-24 twist and they do exceptionally well with big conicals. That is what they were designed to shoot.
My Knights have shot conicals very well too but ive shot them mostly in DISC 45cals and MK85 54cal. The older MKs are exceptionally well made.
All the cap ignition inlines are going to be somewhat dirty shooters.
