Thanks all for your input. I tried googling the JSBs in 5.53 and came up with some older results but they were all 2015 and earlier. AoA and a couple of others carried them but I couldn't find any on their websites now.I'll have to try calling tomorrow to check.
I seem to remember a post not to long ago (but I can't remember where) that someone said that they were still shooting them. Maybe they were getting them straight from the manufacturer or have a bunch on hand?
I'm getting 1moa to 1.5+moa out to 75 yards with the 5.52, just want to see if can shrink the groups a little more.
Pushing a pellet through the barrel isn't the same as when it's fired. That sudden blast of air expands the pellet's skirt to fit the barrel. If you really want to try something in the 5.53 size, there is the H&N Baracuda Match in 5.53 & FTT also in 5.53.
I've tried the 21.14gr 5.53 and they don't do well at all in my rifle. On the JSB 18.13 I can see the land marks on the skirts but need a magnifying glass to see the marks on the head of the pellet. The only spot the pellets are tight is just out of the leade, after that they practically fall out on their own. Also I don't think the barrel is choked because there is no change in the resistance at the end of the barrel.
Hey Blue! I'll let you know if I find any. BTW I'll be in Colorado some time later this year(some family moved out there),it would be nice to meet up if your close to Edwards.