That is how I load my .357 wadcutters, too. Except I use Hornady bulk HBWCs and a very slight taper crimp instead of a roll crimp.
When loading THOSE bullets in a .357 case with the nose sticking out of the case mouth by 1/8", the powder space under the bullet is increased by about 65%. So, you need to be careful that you don't stick a bullet in the barrel while working-up the load that you want for accuracy. I have found that I don't need to increase the charge weight by anything like 65% to get the reliability and accuracy that I want. Something like a 15%-to-20% increase seems to work best for me with Bullseye.
QuickLOAD indicates that seating flush in the .38 Special case with 2.7 grains of Bullseye gives about 12,000 psi, while my load with the bullet seated out in the .357 Magnum case is only about 9,500 psi. Still, I have never stuck a bullet in MY gun, so I like my load. However, YOUR RESULTS MAY VARY.
SL1