I have a new FX .25 cal Slug Liner (700mm) with the 1:16 TR. Testing so far has shown very poor performance regardless of ammo brand, diameter, weight, etc. Javelin 36gr, .250 Javelin 40gr, .250 Javelin 40gr, .251 Javelin 44gr, .250 Javelin 44gr, .251 H&N 38gr, .249 H&N 40gr, .249 H&N 40gr...