A puzzler for y’all...

[kblack583]

-No on the media in cases, all clean.
-I started this project with retumbo and r33. Both ran decent but no spectacular so did a little digging for something else. As y’all know powder was scarce but ran across a bottle of r50 at the LGS so grabbed it. Low and behold it shot fantastic, .250” with the new brass. Still does with the new brass.
That said I have a brand new keg of N570 ready to go but wanted to try and figure out what was up with this r50 and fired brass.
-No don’t have a headspace gauge but only bumping the shoulder back .001”, .020” off the rifling. Don’t think there’s any movement like your talking.
-No oil or moisture on cases.
-.332” neck bushing so could maybe play with that.

DK, do you know what size your mandrel is? Also, did you prep the unfired brass at all? Think there' still something to the fact that the 1x prepped brass was harder to seat than 0x. A .334 neck bushing should give you plenty of neck tension so may be worth a try.

 

[Dkcampbl]

DK, do you know what size your mandrel is? Also, did you prep the unfired brass at all? Think there' still something to the fact that the 1x prepped brass was harder to seat than 0x. A .334 neck bushing should give you plenty of neck tension so may be worth a try.

-Mandrel is .3069”
-Actually the opposite. I probably didn’t state it correctly but the new unfired, sized and expanded cases are actually tighter necked than the 1x fired cases. Makes sense since the neck walls measure .001” thicker than the fired neck walls.
-.334” bushing is on the shopping list