My understanding as others have stated, stronger case head, potentialy greater case life and cough cough maybe bit more coal on the fire..
Been using CCI 450 (small magnum) in my 6.5creed, mostly in the colder months June/July, running StaBall 6.5 ball powder,, no issues.
Copy and paste of below from Petersons brass website....
*Note: All our SRP casings feature a small flash hole in the diameter of 0.060” vs. the 0.080” flash hole found in our LRP casings. This means you will need an X-small/ Undersized Decapping Pin to deprime our casings.
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