i just got the S&W 586-2 (6") and shot 2 boxes of rem umc 38 158gr LRN and noticed flames out the side and front. and a box of 357 same stuff, but 127gr i believe.
am i fine with shooting factory 357mag, the gun is from 1988.
and i seem to remember reading that it's hard to tell if your loads are putting stress on the gun. meaning with say my .45 if the load is to hot the primer will flatten and scrap on the slide. anything to watch out for on the revolver?
my reason for wanting to make hot 38's is i don't want to blow this gun up and i figure a hot 38 vs a hot 357 the 38 is better.
You should have no worry shooting 357 factory loads in your S & W 357 revolver.
If you are handloading, you are correct in that the shooter has no way of knowing if his reloads are getting too hot. For that reason, do not go any heavier than your loading books reccommend. Also, there are other things that raise pressure, besides more powder. So I highly reccommend that you stop a bit under full power.
Arguably, the best cast bullet designed for the 357 is the Keith design, 240 grain, approximately, semi wadcutter. If you use this bullet you may find that if you crimp the bullet in the crimping groove, the cartridge may be too long to work in your gun. I had a heavy frame 357 S & W that was like this.
There are two ways to get around the problem.
1) Use 357 brass and crimp the bullet on it's shoulder.
2) Use 38 Special brass.
With 38 brass you can crimp in the proper crimping groove.
If you measure the OAL of the two cartridges, one in 38 brass and the other one crimped differently in 357 brass, you will see that they are almost identical in length. This means the powder capacity is about identical for each.
Loaded just a bit lighter than full power, for each, should give you peace of mind in shooting them.
Edited to say you must be extremely careful to see that your 357 loads in 38 special brass, are not allowed to find their way into some 38 Special revolver, because that would certaily blow the 38 sky high. For this reason, you should use 357 brass, crimp it on the shoulder, and have less worries. After you are well experienced in reloading them, you may wish to try it by the other method.