Ron -
CVA declined to providespecificationsor to rate their barrells.
Instead theyrecommendedthat I use the following sabot in my gun.
Cabela's has them for$22 at 15 count. Reviewsread well.
http://www.cabelas.com/prod-1/0049036216422a.shtml
The one we recommend is the slick load sabot
Slick-Load™Sabots
AC1563 -.50 cal., 250 Grain
AC1564 -.50 cal., 300 Grain
15 Pack $27.95
Horizontal flutes make it the easiest loading sabot and provide a better gas seal while holding the sabot securely in the barrel.
[/align]