From a squib? I've always heard about reduced loads being dangerous, but have never experienced it. I have loaded reduced ammo for just about every rifle I've ever had.
Yes. From a load with the wrong powder that someone decided would work when they cut the charge in half. Not talking about what most would consider a "squib".
But if what you are doing works for you then by all means continue on. I'm just throwing out information. People can make their own decisions and also do their own research. But I'd be less than responsible if I just sat quietly and didn't offer the info during this discussion.
The danger is a pressure problem and is referred to as S.E.E. or Secondary Explosion Effect. It happens when a light charge of slow powder partially ignites, but because of a low pressure generated it pauses, drops pressure to nearly zero, and then ignites. Where the trouble begins is when the the powder first ignites, the bullet is started into the rifling as well as the unburned powder stacked up behind it causing a bore obstruction. SEE is difficult to produce at will even under lab conditions. I think slow ball powders in large cases were the worst, but even stick powders have caused this.
There are formulas for reduced loads that are published, and the powder companies make recommendations as to which powders lend themselves to be loaded that way. They also offer warnings about randomly reducing loads in rifle cartridges.