I just recently had one built Rem action, brux barrel. IMR 4831 and RL22 have been great choices so far also but RL26 would be my first choice if I could find any.
Factory Nosler 160's AB shoot great.
Currently using
Nosler Brass
140 BT
RL22
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I purchased additional M plus magazines for longer bullets in my Tikka T3X 7-08 which I also tried in my T3, it feeds but not great in the T3.
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If you haven't developed a load you'll need to adjust up until you find pressure anyway.
What data you have is just a guideline.
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I figured out it wouldn't feed with a M plus magazine, not sure why cause that's what I use in my other Tikka but it's a T3X.
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