Competition shooters generally favor small primer pockets. Most competition shooters using 6 creed are not shooting Benchrest or F class, and rather are shooting PRS - in which the format doesn’t allow rounds to have the velocity which would occur if 6 creed is pushed over max pressure. We can’t exceed 3200fps, and we can topple that limit with ease eve using an under max load under the bullets we’re using in the barrel lengths we’re using. For example, I shoot a load which is .6-.8grn below max, and 1-1.2grn below bolt click in my 6 Creed match rifle, and my loads range 3100 to 3185, depending upon which barrel I’m using… can’t go over pressure without going over the speed limit.
But, whether using smaller pockets actually increases brass life or not, it theoretically SHOULD increase brass life, so when we have the opportunity to get SRP brass, we want SRP brass.
LRP in 6 creed isn’t a huge penalty, and for most folks, it’s not even a tangible penalty. I have a set of ~500pc Hornady 6 creed brass, which is reputedly soft alloy, and is LRP, which has 15 firings on it, and I’m syncing it up for my match rifle to start into this new barrel for this new season. I have 8 firings on my current set of 6 Dasher brass for matches, Lapua small primer pockets, I kinda like having separate primer stocks for both so I’m not eating out of the same pile all of the time. I used to neck down Lapua Palma brass (308win with small primer pockets) for all of my 243 win/AI, 260, and 7-08rem & AI to gain that little bit of peace of mind. I was gonna be paying for Lapua brass anyway, so why not get small primer…
Anything beyond that, any comparison of 6 creed LRP vs. SRP is at the very best a claim to accurately count angels on the head of a pin…