what is the proper taper crimp dia. at case mouth on 9mm using hornady 124 xtp hp bullet? after seating bullet the case mouth measures .380 i checked a factory rd. and it measured .375 oal is 1.060 got that from hornady they didn't give me any info on taper crimp dia. i used a slight 1/64 bell, bullet would just set in case. i am newbie on 9mm. Thanks, k&j 223