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3 squibs out of 400 rounds is pretty high. You might look at your loading process to see if you can come up with how the powder failed to charge the case. Looking at the cases in a loading block before seating bullets is a good way to check for over/under charges. In a 44 case, powder height will be easily visible. A powder cop in a progressive is another option.
If you had powder in the case but the primer failed to light it off, it would be very obvious. That much unburnt powder is going to be everywhere even on a light charge.
Causes for the powder failing to burn? Possibly if there was some contaminate in the case such as water or oil. If you had something blocking the flash hole, the primer is going to back out and bind up.
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