Hi. I did some testing today with my tikka t3 25-06 varmint ss.

this very old manual (1964), the Speer #6 reloading manual,  has up to 60gr of 4831 for a 100gr bullet.
At today's standard this is a very hot crazy load …Hodgdon has their H 4831 at 51gr to 54.3 gr Maximun.

I am aware of 4831, not being imr 4831, but my understanding is that H4831 is very close to the original military 4831.

now I loaded some rounds:  53, 54, 55, 56, 57, 57.5, 58, 58.5, 59, 59,5, and 60 gr. with H-4831 to .03 off the lands and some sierra prohunter 100gr.

I started my test. after each shot I looked closely at the fired case, the primer. I also measured the pressure ring ( just at the web of the case ) for each case before and after with my quality Micrometer, all of them were under .001 from a once fired case at normal pressure. ( biggest change was 0.0005 )

I had absolutely no bolt sticking or anything that would tell me to back off
I now ten to believe that in MY gun, these loads were not overhot. ( plz do not try this with your gun. it is not safe )

my question is :

any of you, tikka t3 owner only plz , ever shot a load too hot ?  what were the symptoms in your guns
Did you ever have a stock bolt ?  have you ever seen marks on a case head ?  did you ever blown a primer ? 
I am particularly  interested at knowing if the case head gets marked , from extractor or else, when a load is too hot…

plz don't be shy to share your mistakes, so others won't make them…. 😀

thank
stef

once again do not try these recipes . it is very dangerous. if you don't know what you are doing , the gun can explode…