We made a barrel tuner to try.

I installed it on our custom BRNO 452 with Lilja barrel.

It shot so well in previous tests.

I shot 10 shots at each turn of the tuner head.

That is a complete 360.

Started off with it closed, and opened it one complete turn for each group.

I tried ELEY TENEX at 50 yards and 100 yards.

I tried SK LONG RANGE MATCH at 100 yards.

Will post my results in the next day or two.