Well its been a while, since these last posts I have put together the dies, brass, bullets, made some rounds, shot them off, bulged some cases, ripped some rims, bought another 1907, reloaded more, and shot again....thats the short version.
Newly manufactured 351 WSL cases, 180 grn SP bullets, small rifle primer and 10.0gr of Unique as per the 45th Lyman guide. Seated bullets to 1.89. Rifle fired and functioned fine, threw the brass all over the place, I couldn't even find a couple of them.
Got home, cleaned brass and when going to resize, found that the cases had a real prob going through the resizer, it was at this point I noticed at the base of the case there was a slight bulge. Got worried.
Fourth case in to the resizing, the rim snapped off, couldn't get the case out. Friend got the case out next day, tried a couple himself, noted the bulge put the case from the spec of .380 to about .387. Not to mention some of those first cases seemed to screw up the primer pocket, when I went to reload them, some of the primers slid right in with no resistance, so I deprimed and chucked 'em.
Worried now I had a dud gun and with so little on these things around, there were no ready solutions, so I did what any cgn'er does, I went out and bought another one to compare. Got another first year, but this one looked like it had been around the block. Murphy's Law of guns though, the nice one has a good clean barrel with worn rifling, the ugly abused looking one has a pristine barrel
Took both 1907's out and shot the last five 10grn rounds, three from the newbie, 2 from the first one. Both cases bulged in a similar manner. Had also loaded a bunch of resized once fireds and some virgins with 9.0grn of Unique to compare 1) the lesser load and 2) additional stress on the resized cases.
The 9.0grns still shot well, the brass still flung far, and the cases didn't seem to bulge as much. Resizing them was much more normal, and when I ran them through an inspected them, the bulge wasn't all around the base of the case, it was only on about 1/4th in a half moon, which corresponds to the ramp area of the breechface. When I stick an empty case into the chamber, you can see this little portion which is unsupported by anything, hence the bulge.
Funny little design issue, I have to assume this was not uncommon since its the same on both of my copies. Anyone else have any experience on shooting/reloading this round?