I have used those bullets before with no issue, currently I use 180 grain ones cast from a lee flat nosed mold oal 2.5 and they don't touch. From memory robs bullets are bore rider style ie straight sided from ogive to tail, the Lee is stepped from ogive to crimp groove the bullet is under bore diameter.
Bore riders are supposed to be more accurate but he'll it's a 3030 not a target rifle.
A change in bullet style will fix it, alternately once loaded the only way out is forward should work fine.
I'll dig one of mine out later and put up a picture
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