I will bragg a little.
To set the stage, I was 19-20 way back when. Master class SB shooter. I entered every match I could and was doing great. Tried out for the US Olympic SB team, really no chance in making it but they take the top 50 or so for final tryouts back then 1978-79 time frame. That was my goal.
My local team asked me to shoot on the high power team, shooting the NM course. The club had a number of NM M-14s and NM M-1s available on loan from the DCM. I had never held a M-14, I had fired a M-1 before and owned 2 mini-14s.
I showed up on match day was assigned an M-14 and given 100 rounds of ammo. Took that stuff to the 200yd line to shoot a match. My friend said it was zeroed at 200yd yards. Remember we got 2 sighting shots before the match started. That was my 1st time pulling the trigger. Both rounds were 10xs. Boy I thought this is easy. But as matches go, I failed to shoot 100s. Likley I was too cocky. I tossed my score books a decade ago but shot well enough to get placed into expert level where I stayed for years. I shot some 100s in RF 200, RF 300 and some SF at 600 yd but never standing at 200yd. I wore out that M-14 and got another. I also bought a NM M-1 and shot it at 600 and 800 yds in SF matches a few times. I used the M-1 in police/fire Olympics several times. I got a Bronze metal once and shot a high enough score to be a police sniper in WA. Shooting against about 50 guys with scoped rifles. That was easy, the targets were full size human silhouettes at 100, 200 and 300 yd. No way could I win but only needed an 80%, I was under 90%. the course was combined with standing, tripod, sand bags. I only used the sling. The range guys were making bets on me after the 100 yd stage. They said it had never been done before. Some of the shooters couldn't believe a non scoped rifle could be that good. The SWAT guys mostly shoot from sandbags or tripods. I understand why, but they should be practiced in unsupported standing also. The SWAT team next to me had never shot standing. I helped them get set up.