Is it just me or are 223's particularly "unreliable" when it comes to predicting velocity against barrel lengths?
I shot my Rem M7 in the weekend, Hornady 55gn ammo with a specified velocity of 3240.
The M7 has an 18" barrel with a muzzle forward suppressor. I was surprised to Chrony the H55's at 3100, from everything I'd read they should have been around 2950??
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