Any of you using the Proof pre-fits have any issues with having to seat the longer, higher BC bullets too deep into the case with these?
Tikka Proof pre-fit question
- Thread starter Korhil78
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ShtrRdy
Well-Known Member
It might help if we knew what cartridge and bullet you're thinking.
Sorry…it's gonna be in 7 PRC and using a 170 Gr hammer hunter
laker
Well-Known Member
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- Dec 9, 2017
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A 170 grain copper bullet is going to be REALLY long. Probably longer than a 180 eldm. So my guess is it's going to have to be seated pretty deep into the case
quandary
Well-Known Member
A Tikka Proof Pre-fit it will be chambered with a SAAMI reemer consequently the barrel chamber will not be the problem. You'll want to look at the data sheets on the CEB website. From that you can see how long the bullet is after the seal-tite band. Add that to the case length and get your COAL. Make sure it fits in the Tikka magazine. Tikka mags are short, the longest being 3.4". There are retrofit bottom metals and mags to expand that length a bit. Mountain Tactical and Unkown Munitions both have these.
azsugarbear
Well-Known Member
I did run into this problem with a Proof Prefit barrel in 300 WSM for my Tikka. It wasn't so much a problem with the chamber as it was he bullet I wanted to use. It shot just fine, but the bullet was seated just a little too deep into the case (to get my best distance to the lands) for my liking. To be clear, the problem wasn't the chamber, but rather this particular bullet and how I wanted it positioned in the case. I rented a throat reamer and removed some additional material to move those lands further out. I still had plenty of room in the magazine as the WSM was built on a long action. It was an easy problem to fix.
Thanks. That's some of the information I was wanting to hear. Did you just hand turn the reamer? And how did you measure how much you took out?
No, I have used several, they all seemed to be spot on with SAAMI specs. I haven't used an all copper bullet though. You may, in fact, have to get a reamer and lengthen the throat.
azsugarbear
Well-Known Member
Just turned by hand. There is a 'stop' built into the throater that will not allow you to go deeper than what was initially set by you. Go slow and be careful. I accidentally overshot the runway because a small shaving was holding the bullet back when testing to find my new lands. Once I realized the problem and removed the shaving, I found I had gone deeper than intended. I just used a longer bullet to make the adjustment I was looking for. The barrel now shoots the 190 gr. Hammer bullet into sub 0.5 MOA groups at 200 yds.
quandary
Well-Known Member
Do you think this was a quirk of Proof for Tikka or simply that you needed more throat than SAAMI specs to run the combination you wanted? I would think a SAAMI reemer is a SAAMI reemer regardless of who was doing the chambering.
