Step # 1
Buy a reloading manual and read it cover to cover before you begin.
I started with Lee's
Modern Reloading Second Edition and have since purchased Sierra's, Lymans and Hornady's reloading manuals. You will find everyone has an opinion about which manual is ultimately better. I find I reference different manuals for different things.
Most will have a section dedicated to hand loading for semi-auto rifles (which some manuals have refereed to as advance hand loading).
If you are serious about starting up hand loading, buy at LEAST one hand loading manual, but I would suggest getting three or four eventually.
Edit
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re-reading your original post, yes you can reload for the M14, but there are a few things (arguably) that I would suggest to be safe.
1) Due to the M14's free-floating firing pin, I would suggest a hard primer to reduce the chance of slam fires, such as CCI primers. Also, make sure your primers are properly seated (recessed about 0.003") again to reduce the chance of slam fires. If you seat too firmly you can crush the primer and the primer will not ignite when hit with a firing pin.
2) Some do neck size for their M14 but I advocate Full Length Re-sizing only. Most information I have referenced indicate the brass is extracted from the M14 before it has fully expanded thus creating a situation where a neck-sized round may not re-enter the chamber.
3) I suggest not reloading a case for the M14 more then 6 times. The brass gets worked so much when full length re-sizing that during extraction the case head could separate leaving most of it inside the chamber. I carry a broken case extractor in my kit for this eventuality.
4).308 vs 7.62 NATO-just hand load for the .308 Win. Don't concern yourself with trying to duplicate NATO rounds or using military brass until you get some experience hand loading. You can however shoot factory NATO rounds through your M14 with no issues.
5) Lee factory crimp your rounds.
6) Learn and understand what thousanths of an inch means (ie 1.142")
I was just like you when I first started 4 years ago. I was confused and had no real concept of what I should get. It was suggested on this site for me to get the following equipment (I have added some to the initial list as I found I actually didn't like loading without at least the equipment below):
- Lee Breech Lock Challenger Kit (containing the Breech Lock Challenger press, off the press hand priming tool, powder thrower, lee cutter, scale, sizing lub, funnel and primer pocket cleaning tool)
- at least 1 pack of extra breech lock bushings for your dies
- .308 Win Case Length Guage to use with the lee cutter
- RCBS chamfer tool (the included lee one in the kit is aweful)
- Lee Pacesetter Full Length Sizing Dies in .308 Win
- Lee .308 Factory Crimp Die
- Lee Decapping die (to deprime as a separate step from re sizing)
- Loading tray for use while charging cases with powder
- Mastercraft Electronic Caliper with Digital Display (from Canadian Tire)
- Lee Loading Manual
- Safety Glasses!!!!! <- most important
- optional - hand drill or battery operated screwdriver for use with the lee cutter
- optional - a tumbler to clean your brass. I started out soaking them in vinigar/water, then rinsing and drying them, but finally caved and bought a tumbler to save headache.
- optional - a little plastic cup to catch the smokeless powder as it comes out of the powder thrower. I originally tried to use the aluminum pan with the scale and the powder went all over the place.
- optional - brasso to polish up your brass so you can show them off at the range
I'm sure there will be people who refute some of what I suggested however, I have loaded accurate ammunition with no accidents for 4 years now. Lee sells the most inexpensive equipment. You can go with RCBS or Lyman or even Hornady and get better quality. After 4 years of loading though, I only have 2 complains for any of the Lee equipment I bought; the dies are prone to rust so be sure to oil them with gun oil before you put them away, and the lee chamfer tool is TERRIBLE (so is the lee scale but it is still usable. I would suggest this to be the first piece of kit you upgrade.)
The M14 is a fun rifle to load for, and I suggest you hunt down is a copy of Handloading for Competition - Section 9 - Reloading for the Match M14 by Glen D. Zediker. I used that as my primary reference when learning the Do's and Do Not's of hand loading for the M14
Hopefully that gave you some information to work with. Good luck and remember to have fun!