I've come across a .243 blaser barrel, which sounds quite tempting but the guy at the shop says it measures 20 inches/ 50 cm. My other barrels are both 57cm/ 22.5 inch factory standard. (And that's what's on their website too). I'm guessing this one may have been cut? And if so how much velocity would it loose for those couple of inches off? I was mainly going to set it up for foxing with a separate scope so velocity loss would be a concern. Thankyou.