Well, that's annoying. 257 Roberts and Barnes TSX.

[TSnave]

Let me just start by saying I've had good luck with Barnes TSX. So when I got my 257 I ordered up a couple of boxes of 100 grain bullets but with one thing and another I haven't gotten around to loading up some test ammo. Finally had the time and inclination the other day. Figured out that the controlling factor is magazine length but when they are loaded to fit in the mag the case mouth is placed over a groove - and there's not enough engagement to keep the bullet from sliding back. So I can seat DEEP, or I can load long and have a single shot. Razzafrazzin' fingermuckin' bogsnipes. Guess I'll stick with traditional construction, or maybe get some Nosler E-tips.

 

[A382DWDZQ]

Mouth being over the groove it should still hold it.

 

[DiabeticKripple]

if you have a bushing die, get the next size smaller bushing.

i had to do this for my 7 PRC and the 168GR LRX. Same issue.

 

[sierracharlie338]

I had great luck with the 100-117 gr btsp out to 300 in my Roberts.