art123: I've also used Trail Boss in both .38 and .357, too. But thought that its fast burn rate was better suited to .38 case capacity.** So, when loading .357, I generally stick to 231/HP38 with 125 grain bullets. Unique/Universal with 150/158's. I agree though....any of these powders will work well with these bullets.
** Note: Trail Boss consistently delivered the best accuracy in .38 Special. This, at about 80-85% load density.
My experience with the Lee 158 gr. LRNFP was generally good. No stability issues....keyholing, yawing, etc., observed. My only gripe with the Lee bullet is that the bullet's wide-nosed meplat sometimes caused feeding problems. More so in 1866, 1873 and similar rifles. But occasionally in the Rossi, too. Usually when cycling the action fast....but that also could have been operator error. Likely a bit of short-stroking involved.
No issues at all, when using either 150 or 158 gr. semi-wadcutters. Though these feed poorly, or not at all, in 1866/1873 rifles. Best performing swc(in both .38 and .357) for me, was the 158 gr., Keith-type bullet thrown by the RCBS mould. Followed by the Lee 150 gr. swc.
Overall, my experience mirrors yours. I believe the 125 grain RNFP is the most suitable bullet weight/shape, for the Rossi .357 rifle. Function and accuracy always good.
I have used Lee TL bullets in various other calibers....but not in .38/357. Am interested in your observations. I can't see though, why they wouldn't work just as well as the others.
Al