The SX is quite delicate. I used a lot of 55gn in my .225 and at 3600fps they left a trail of smoke and splashes of lead around the holes in a 100yd target. Accuracy did not seem to be affected and they made a mess of gophers.

My dad used 50gn SX in his .221 and I watched him become quite frustrated trying to shoot a fox in an alfalfa field. The bullets disintegrated on the stems.

One unerring mark of the love of the truth is not entertaining any proposition with greater assurance than the proofs it is built upon will warrant. John Locke, 1690