The Model 544 has been returned from the gunsmith and I am very happy with the fit and function. With 7 to 8 grain loads of Unique behind 240 cast .429 bullets accuracy is good. Since the cylinder is a 44 mag chambering I will try some 8 to 9 grain Unique loads with the aforementioned cast bullet, in 44 mag brass. No 44 mag hot load for this one! Gary