I agree with the guys above. It may look like a small amount but it should have no problem firing off. I load 38 spl for both my Rugers and my 1873 and have had no problem with either of them using regular small pistol primers. I have talked to a few long time cowboy shooters that when they load way to the low end of a powders recommended range, they will use a magnum primer to insure a full burn. If you are using the manufacturers load data and you use a magnum primer while loading 38s You will not come close to exceeding the pressures that a gun made to handle a 357 magnum. The key to this is NEVER exceed the powder manufacturers load data. The people that make the powders know what they are doing. Trust the experts! I usually load at mid range. If the powder for the bullet weight is say 4.2 gns to 5.2 gns max, I will load at
4.8 gns. I have used magnum primers for this and they work well but then again, I have not had any problem with regular primers either. If you get signs of not a complete burn such as granules left in the case or a round that doesn't sound or feel the same, then try a magum primer. It may work better for the powder you are using. Just a thought. D.D.