jo191145 Hunter is in the R19/IMR4831 burn range and not too slow. I`ve used R22 and H4831 in my 6.5x284 with 100 and up bullet wts but never pressed them. Both are slower then Hunter.
Ramshot uses the slower Magnum in the 264 Mag with 85gr bullets and according to their web site did not make 3700 fps with that combination. Pressures don`t show until 70K+ psi, and primers from what I`ve been told, and case head expansion etc needs more pressure yet. You might not see pressure signs but I strongly suspect you are well over 65K psi. Ramshot shows loads at the 64K range so I suspect 65K is the CIP limit SAAMI doesn`t reconize the cartridge.
I`m not saying your load isn`t safe in your rifle. Every rifle is different and a rule unto themselves. I`ve rifles that I`ve loaded slightly over book with no problems and another that I can`t get near the books max without popping primers. I actually get book max velocity at just over starting loads.
I do think your pretty close to the edge though and either way that has to be one flat shooting lazer!.
You might want to try R17 in your 6.5x284. I found it to give very nice accuracy and best velocities in mine with 140gr Nosler Custom Comp`s and 120gr MK`s. It is similar to IMR4350 in burn rate so its a hair faster then your Hunter.
http://www.6mmbr.com/reloder17.html
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