Thank you Kevin!!!! That one isn't even Internet baloney; it was already deeply entrenched back when all we had were books (remember those?) about guns.
I shoot 77 SMK, 77 Nosler, 75 whatevers with no problem in both my 1:8 match AR and 1:9 M&P-15. I've only shot the M&P as far as 100 yards though.
Hornady 75 AMAX, which is long and skinnier than the 80s, works fine in the 1:8 match AR out to 800. At 900-1000 with service-length barrel, even the mighty AMAX over primer-flattening loads of RL-15 will start to go subsonic and keyhole, according to the guys pulling my target the only time I tried it.
I haven't tried the Berger 90 VLDs at all, or any over-mag-length load in my M&P. When my barrels wear out, I'll put 1:7s on both of them and be done with it.
When life gives you lemons, insert copper and zinc wires in them and repeatedly shock your tongue.
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