My son and I built him a 16" grendel and we have had great luck with 123 sst's. Whitetail, axis, and hogs all dropped where they stood. I wouldn't think twice about any of the mentioned loadings. Just see what gives you the best grouping.
Bullet placement is important. Having said that a well placed shot will do the job with most them bullets mentioned. My 7 yr old shoots a ruger grendel and he’s downed everything he’s shot so far using sst’s up to 180yds.
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