Interesting to see they have a ±2.5% max spread in standard Exacts. When I have bothered to weigh a tin or several they are much better than 2.5%.
Also shows the need for a standardised approach to assessing a batch (tunnel, fixed rig) rather than off the knee and 'no wind to speak of' :-)
As to why one batch favours a barrel/air injection system? Who knows but the cost per projectile is hardly in the same class as a full bore F-Class rig requires for 1000yds groupings.
BFTA Secretary 2012-2014
CSFTA Secretary 2014-2016