09-22-2022, 09:51 AM
That is a hot, compressed load.
QL is predicting your load is 64K lbs (Grendel SAAMI is 52K lbs). 106% case full is crunching powder when you seat the bullet. Pressures increase exponentially when powders are being compressed, and also less predictable as you change the burn characteristics. 2520 is a bulky, slow powder for Grendel out of a short barrel. The case becomes full before the powder becomes compressed.
I'd be loading no more than 27.8 which is exactly 100% full and right on the SAAMI pressure limit for 2520.
What does the case look like?
QL is predicting your load is 64K lbs (Grendel SAAMI is 52K lbs). 106% case full is crunching powder when you seat the bullet. Pressures increase exponentially when powders are being compressed, and also less predictable as you change the burn characteristics. 2520 is a bulky, slow powder for Grendel out of a short barrel. The case becomes full before the powder becomes compressed.
I'd be loading no more than 27.8 which is exactly 100% full and right on the SAAMI pressure limit for 2520.
What does the case look like?