Hello,
I have plenty of military type autoloader experience, and somewhat limited hunting autolader rifle experience. I will chance offering some hunting autoloader observations. There are others in this forum that appear to have very extensive hunting autoloader experience, and in time they will probably offer more in depth observations. My sole rifle cartridge hunting autoloader experience is based on having owned 1 Remington 742 in .30-06 (sold) and 2 Remington 7400 rifles, a .308 (sold), and a presently owned 7400 Carbine in .30-06. Like you, I shoot at targets quite a lot, hence the appellation "targshooter". I have not had to do any special reloading processes for the semi-automatic Remingtons, using full length sizing dies as I do for all my rifle cartridges. I also place a slight crimp on all semi-auto ammunition. The accuracy of the three Remington semiauto rifles has been very good. The durability of the Remington semitautos rifles is not on a par with the military types, at least based on the 742, as it could not take a season of military match shooting. That said, I have found that they will provide at least 3 thousand trouble free firing cycles. Thoroughly cleaning the hunting semiauto Remingtons and Brownings is not easy, with some tool assisted disassembly being required. A good source for disassembly instructions are the Gun Digest Firearms Disassembly Guides. I believe the Browning BAR is in the same volume as the Remington 7400. This guide is my basis for the above disassembly comparison, where the BAR looks a little more readily disassembled. From experience I can inform you that for a thorough cleaning (bolt removal and complete gas assembly removal and cleaning) the Remington required extensive disassembly. If I may suggest an alternative, take a look at the Benelli R1. This disassembles without tools and appears to be quite accurate and functionally sound, as its gas system is already combat proven in the Benelli military shotgun in service with various military organizations, including the US Marines. However, the R1 is a thousand dollar gun. Well, good luck.