DMK,
Good info here, but much not addressing your original question... Which is more accurate, M14-M1A or the M1??
As stated, Roland Beaver is a former Marine armorer who believes strongly that the M1 CAN BE MADE more accurate on a regular basis than can the M14-M1A. Another former Marine Armorer, Gus Fisher, who is one of the "Who's Who" among M1 collectors and parts suppliers, also supports this view. I think there are others who support this view as well, but don't remember their names.
I do not know the time frame during which Mr Beaver was an armorer in the Marines, but Gus as one of very few armorers for "THE" Marine Shooting teams during the late 60's and 70's when the transition between the M1 and M14 on the military Shooting Teams was being accomplished.
Not many people today will agree with or bother to look into the history as to why Mr Beaver and Mr Fisher hold these views. It is rather involved.... but has mainly to do with the fact that when the M14 was replacing the M1 in competition shooting by the military teams, new and vastly improved Match ammo (7.62 Nato), bedding materials, stock materials, and barrels were coming into notice and use. When applied to the M14 these brought the rifle up to a very high standard of accuracy, above what the Teams had been getting with the M1.
All well and good..... BUT, when the Armorers began retro-fitting some of their M1's with the same more modern barrels, bedding materials, and stocks, they immediately surpassed the best that they had been able to get out of the M14's. According to Gus Fisher, who also still builds Match M1's and M14's, this still holds true today..... Given equal quality barrel, stock material, bedding, and ammo, the M1 will beat an M1A-M14 95% of the time to a degree that matters on the range (he gave group figures in his treatise on the subject but I can't find my copy at the moment).
Now, the $64k Question: Why did the Teams continue to shoot the M14 when they had more accurate M1's at hand??? Very simple.... The M14 was "IN", the M1 was "OUT". They were ORDERED to shoot the M14..... No IFs, ANDs, or BUTs... it was a matter of, "Aye-aye, Sir. We'll shoot the M14 and like it, Sir".
That was then, this is now.... As for me in the here and now, the M1 speaks to me. The M14-M1A and M16-AR15 do not. I own two very nicely made M1 Match Grade rifles that I shoot in local shorty courses and Across the Course as well. I CAN shoot higher scores with an AR... but I LIKE to shoot my M1's much better. I currently shoot at the top end of NRA "Expert" in both Highpower and Long Range, all shot with an M1. I WILL get my "Master" rating with my M1's or die trying.
Came very close this year.... It requires three 80 round matches in a row above the Master break point of 94% to get the upgrade in rating. Shot back to back 94%+ scores several times, but could never string 3 of them together.....
In any case, it's not the rifles fault. The rifles are VERY capable of cleaning the 600 yard target. My own downfall comes with the rapid stages and in standing. Once I get my own act together, me and my M1's are going places....
Hope this answers your questions....
best to all,
Swampy
Garands forever