Montana Gold 121 gn IFP bullet uses
I am an avid reloader and own many calibers to include the 380,9mm,357 sig in the .356- diameter category. My recent purchase of the above named MG 121 IFP shows promise as well in my beloved 357 SIG. As most reloaders realize, the 357 Sig is limited to a particular bullet length of NMT 1.140". I made a tool steel gauge that is exactly the thickness of the amount of bullet that sticks out of the end of a properly loaded 357 Sig round. This gauge thickness is .275 inches with an exact .3555" bore at the insert end of my gauge. If any amout of bullet(projectile only) is inserted in my gauge and sticks out the opposite end,that bullet is too long to use in the 357 Sig. The .3555" hole is where the bullet hits the beginning of its ogive. There should be enough purchase on the bullet base diameter for a decent taper crimp. This gauge saves a lot of headaches with trying to use too long an ogive bullet.