I just bought some Beman MFX classics 500's and I'm shooting a 45# recurve at 28", at my 28.5 length maybe 47#. I have yet to bareshaft or put them together, I'm just wondering if the 100 grain brass inserts would make them too weak even as I cut them down. I'd like to stick with the 145 grain field point. Set up without the inserts, my arrows would be around 450 grains range if left at full length. Is that enought to get good penetration on a deer? Or should I add the brass inserts? Thanks for the help. Wish they had a 50 grain for an insert.