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Discussion Starter #1
I know this has probably been asked before,but I am new to the 6.5cm.I just brought home a RPR in 6.5.I reload to squeeze accuracy.Went on Midway to brass shop and I noticed lapua brass has a small rifle primer pocket,Hornady with a large.Not an expert reloader yet so can some one give me the reason for the difference?Is this just a manufacturer preference.Not going to by till I understand what the difference is......
 

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Good question and there are a lot of different opinions on it

I know a guy who did some testing on large vs small with the 6.5 Creed. He used Starline brass because they offer you a choice between large and small primer. He used multiple loads of different weight. As far as accuracy the small were better......most but not all the time, the groups were separated by only .200” at most. The same could be said for MV, a little faster with the same charge but not ever charge. When it came to SD’s LRP were lower.

Some people have experienced “blanking “ using Lapua brass. That’s basically a pierced primer without signs of pressure, it has more to do with the size of the firing pin and SRP, bushing it will fix it or going back to LRP’s.

Also Lapua SRP brass has a smaller flash hole so be prepared to do a little work to your decapping pin because it probably ain’t gonna fit.

Bottom line is some claim better results, some don’t.

I only use Hornady brass with my 6.5 and I’ve shot sub MOA at 500yds. It seems works for me.

If you want a starting point load wise shoot me a PM. I’m more than happy to share what works in my RPR.

ETA; Some report better accuracy with SRP when they “hotrod “ a load, but not with a midrange load. Better midrange load accuracy was a achieved with LRP.......go figure.
 

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Discussion Starter #3
think I will go with the hornady brass.I have a lot of large rifle primers.Going to try from 105 gr bullets and up.I have been looking at the new winchester 6.5 powder and it looks interesting.Thx
 

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Welcome to the forum from the Buckeye State ...
 

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Discussion Starter #7
thank you all for the welcome.while I was waiting for an answer to my question I took out my RPR and threw it on the dining room table to adjust LOP and check rise.Suprisingly comfortable for a plastic check rest but I think I will look for a nice thick piece of leather to cover.Dam just thought .....the neoprene covers for buttstock might cut and fit well
 

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No accuracy difference between small and large, none notable until you’re shooting an unlimited class rifle, at least.

The difference: case life. With the same alloy and heat treatment, for example, Starline beside Starline, the small primer brass should last longer before primer pockets get loose and the case heads expand too much. Pretty simple - the casehead is thicker around a small primer than it is around a large primer. More metal is stronger than less.

This is compounded by the fact Hornady is relatively soft brass, and Lapua simply isn’t. With the same loads, I have had had Lapua brass go 25 loadings, while Hornady brass started slipping primers at 10-12 (a few at 7-8).

Observationally, confirmed using a hydroseater, I have more consistent neck tension between loadings with Lapua brass than Hornady brass when not annealing every loading. Hornady gets hard quickly, very hard, very quickly, compared to Lapua brass. The change in seating pressure from one firing to the next is much less with Lapua than Hornady.

I use both Hornady and Lapua brass, and if a guy can buy Hornady brass for 40¢/ea instead of $1/ea, a guy might convince himself there’s a savings in the short term.

Some of the smallest groups I have ever fired have been with Hornady large primer 6 creed brass, but there’s no denying, Lapua will last longer and change less and more slowly than Hornady during its life.
 
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