Sounds like pure luck. You didn't say what you were loading, a little hot for .38 special, pretty light for .357 magnum. Either way if you had that charge weight it should have run them down and out the barrel. One more example of "if it don't feel right, stop shooting and check things out" before firing another round. I'd be checking my powder measure for consistency.
This is an area where you can find conflicting data, so it's not guaranteed that a 4.7 grain load is "hot" for the 38 caliber. Hornady's data was developed using a 4 inch model 15 and features a starting load of 3.9 grains of Unique with a produced velocity of 600 fps. Sierra's data was developed with a 6 inch K-38 and features a starting load of 5.0 grains of Unique with a produced velocity of 750 fps. Looking at Alliant's data yields NOTHING for a 158 grain jacketed bullet in either 38 or 38 +P. When I run into this I tend to try out some test loads at a charge weight that falls into the overlap area between the conflicting data sets. The bad news in this case is that overlap is exactly 0.10 grain, so your initial would be 5.05 grains if that was at all possible.
In addition I really don't like it when the powder manufacturer doesn't list my chosen powder with my chosen bullet type. This sort of indicates to me that the powder manufacturer has determined that particular combination isn't suitable. What we may be seeing here is the result of a powder that wasn't well suited to the bullet chosen.
Having recently been through a poor powder choice (SR7625 with 125 gn. plated) I now spend a bit more time looking for confirmations and pass on combinations that don't confirm across several different sources. BTW, what I found was extreme position sensitivity and with the powder lying "wrong" the velocity was only 400 fps. Fact is I was real lucky I didn't squib a barrel.
A tip for those reading this and shooting with either plated or jacketed bullets. If your 38 caliber revolver starts sounding and shooting like a 22 caliber with those new loads it's time to pack up and go home. Because you really don't want to push your luck and shoot those weak rounds up. Jacketed bullets produce a lot more friction in a barrel and are much much easier to squib as a result of this. Take any remaining ammo home and recover the components for use in a different recipe. BTW, I've reused pulled bullets and they work fine for range duty.
Now about getting those stuck bullets out of that barrel. Since the one up near the muzzle is visible I would drill it out so that a wood screw will tighten up well and pull it from the barrel using a slide hammer. For that squib near the forcing cone use a brass rod down the barrel and hammer it free.
After that you'll need to get the barrel as clean as is possible and then use a penlight to check for bulges. If you find it bulged near the forcing cone it probably won't have much effect on accuracy. However you may find you have minor issues with leading that didn't exist before and you will want to keep an eye on the frame under the barrel because it might crack at some point.