I'm reloading 9mm rounds for a new (old) Series 70 Colt Commander. The load is 124 gr. lead RN bullets w/ 4.5 gr. of VV N340. The loading manuals call for an OAL of 1.41, but when I load at that length the case sits past the barrel hood and the gun won't go into battery. If I set the OAL to 1.090 the bullet will seat fine, but I'm afraid that such a short OAL will result in too high pressure. The lead bullets mic out at .356. BTW, the OAL of 115 gr. factory loads are way above 1.41 and the bullet seats fine. I'm crimping the bullets and I've even polished the chamber. Nothing makes a difference. I've got 1,500 rounds of these bullets and I don't want to dump them. Plus, because of costs I want to stay with lead.
I've got two questions: (1) since I'm loading at the lowest charge recommended by VV, will I be risking a problem if I go with the shorter OAL; (2) what modification could I make to the gun to feed 124 gr. lead bullets.