A 185 at 1200+ seems like a very strange .45 load. Where do you get a bullet intended for such velocities? That is, the bullets are designed to work within a certain window of velocities, but how does the bullet work when driven 100fps faster than that? I'd be especially suspicious of, say, a 180gr load in 10mm at 1300+fps; today's 180gr, .40" bullets are surely designed for use in .40 S&W, so driving them 300fps faster?
A 300-400fps deviance is not very big. Most bullets are designed to expand within a velocity range that often spans as much as 1,000 fps. Some dual purpose bullets (pistol and rifle) are even designed to reliably expand with ranges that span nearly 2,000 fps.
Next time you're in a local shop that carries reloading books, pick up the Hornady reloading manual, and anything else that has the plastic removed.
You'll see pages and pages of charts telling you
exactly what velocity range each bullet is designed to expand in.
That, of course, is the
ideal velocity. In reality, things often differ.
One of the most popular low-cost bullets in factory ammunition in the U.S. is the Winchester Power Point. The very same bullet is produced in massive quantities for bulk sales to reloaders. In .277" diameter, the 130gr bullet is the most popular. I used to buy them when I found a good deal on a bag of 250-500. Last time I checked, they were rated to expand from 2,100-2,800 fps. (Pretty sad, considering they are coming out of the .270 Win at 3,010 fps, according to the label.)
I got tired of the crappy accuracy from the Power Points I had, and decided to load a bunch of my 130 grainers on top of some Trail Boss powder. At a whopping 1,200 fps, they still expanded.
And... for those of you that don't pay attention (some noticed)....
Double Tap lists their test firearm next to the velocity and energy figures.