The difference for me has been more about fat barrel/skinny barrel.

EG/R have shot similarly. 243 has shot better than any 30 caliber, smaller bore size leaving more metal around the 243 bore.

No 99 has shot consistently when using the forearm as the primary rest. I have practiced moving my left hand back almost to the receiver when shooting off-hand (silhouette comps helped this 1000%!)

But the best forearm? Free-floated of course!!
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