I've always considered the .357 caliber 125gr and 158gr Gold Dot to be a dog in performance regardless of the cartridge in which it's loaded.
I consider the 135gr .357 projectile loaded by Speer as "Gold Dot Short Barrels" is an excellent projectile in really any length barrel whether in 38 special +P or 357 magnum. BTW, the published velocity figures for the 357 Mag load are from a 2" vented test barrel, and they don't look that great vs. the 38 special +P. Out of a 4" barrel, they chrono in the 1200fps range in my experience-definitely well into "proper" 357 mag territory.
As a general rule, I don't shoot 357 Mags out of snubs because I don't consider the extra noise and flash to give that much advantage relative to what is generally a relatively small performance increase vs. a 38 special +P(the difference is often in the 100fps range). In my experience, you need a 4" barrel at a minimum for 357 Mags to show a marked advantage.
I consider the 135gr .357 projectile loaded by Speer as "Gold Dot Short Barrels" is an excellent projectile in really any length barrel whether in 38 special +P or 357 magnum. BTW, the published velocity figures for the 357 Mag load are from a 2" vented test barrel, and they don't look that great vs. the 38 special +P. Out of a 4" barrel, they chrono in the 1200fps range in my experience-definitely well into "proper" 357 mag territory.
As a general rule, I don't shoot 357 Mags out of snubs because I don't consider the extra noise and flash to give that much advantage relative to what is generally a relatively small performance increase vs. a 38 special +P(the difference is often in the 100fps range). In my experience, you need a 4" barrel at a minimum for 357 Mags to show a marked advantage.