Basic,
There are some interesting points in your comment.
When finding a reasonable load I use as many sources as possible. Manufacturer tables (conservative),
6.5 Grendel forum (on average hot loads), and Quickload (conservative). Adding to that you can look at spent cases for an idea of pressure but it's like reading tea leaves. By the time primers are cratering and flattening it's too late. Ejector swipes are common and can occur with mild loads. The first thing to break is the weakest link in the pressure containment system, the bolt lug. Grendel is a wider diameter bolt face than 5.56 so there is more pressure on the lugs. No doubt part reason why the SAAMI recommended max pressure is only 52K. The issue I think from being on the 6.5 Forum is Grendelers are always pushing the limits of what is by design a slow calibre and reports of bolts breaking are common enough to be comfortable that's what breaks first.
That said, if you want to consider the bolt as a consumable part (and always carry a spare like I do in the butt) then you can push hot loads through it until the bolt prematurely breaks - then replace it and carry on. It is highly unlikely to blow up in your face and you may not even know a lug has broken off until you get home. We replace barrels when they wear out, so we can also replace bolts every now and then. Just a thought, but requires acceptance of the risks that go with loading hot.
From the opposite perspective you can ask whether that extra velocity is critical to achieving your shooting goals. If shooting paper or steel at known distances; so what if the bullet arrives at the target 100fps less. A slower bullet will be affected slightly more by the wind, but that's about it. If hunting, the animal is not going to know the bullet is 100fps less than it could be - Dead is dead. So from this perspective, why wear out the gun faster if you don't need to?
I note on Hogdgon's website they don't list anything heavier than 123gn. Like I said, 130gn is less efficient for a small calibre like Grendel. This is because heavier bullets are longer, and in an AR the magazine length limits the OAL. When loading rounds to fit in an AR mag the longer bullets are pushed further into the case. This displaces precious space and there is less left over for powder. Heavier bullets also require slower powder and that has a compounding effect on the smaller volume available for bulkier powder.
Here's your 29.2gn 4895 load predicted in Quickload out of a 16" barrel...2435fps. Computer predictions never match reality exactly for all sorts of reasons, but they are close.
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