6.5 Creedmoor Large Rifle Primer Brass

We have Lapua 6.5 CR LR primer brass as of today.

Any background on why the switch? originally the small primers are supposed to be more than sufficient? Has testing/research disputed this? I've shot both large primer 6.5 (Hornady brass) and the small primer (Lapua) and the results are nearly identicle
 
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