RE: semi auto for deer
I cannot personally comment on the 750 vs the BAR. What i can add is:
1. my browning auto 5 is very reliable
2. my browning BLR in 308 cycles very quickly & is a deer-killing machine. i prefer it over a BAR
3. my neighbor has used a 30-06 BAR for 23 years. he never had any cycling trouble until this past year
Also, as already mentioned, don't overlook the Ruger Deerfield in 44Mag. Mine is very reliable, and will hammer a deer/bear out to 150 yards. You may also want to look at a semi-auto shogun in 12 or 20 gauge with a rifled barrel.