putting a 6 creedmoor Hawk Hill 7 twist 26” barrel on my Tikka T3. What freebore has worked well for you all to shoot 115 dtac’s. Thanks
Freebore for 115 dtac
- Thread starter nrspence
- Start date
My reamer is a .163, and is about the shortest id go. The saami 183 would be just fine as well. Certainly shorter will work, but you just start pushing the bullet deeper than necessary. I’ll be back with some pics I took of some loaded rounds.
L to R: 115 rbbt, 105 hybrid, 110 smk these are at touching in a .163 fb chamber.
OAL:
115 2.809
105 2.803
110 2.893
Aics magazine, bottom to top: 105, 115, 110. Note the 110 does NOT fit in this unmodified magazine.
AW magazine, same order.
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OAL:
115 2.809
105 2.803
110 2.893
Aics magazine, bottom to top: 105, 115, 110. Note the 110 does NOT fit in this unmodified magazine.
AW magazine, same order.
Sent from my iPhone using Tapatalk
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Thanks for those pictures. My smith says .136 freebore, but that seems to shallow for the 115 dtacs and 110 smk.
Ask him if he’s got anything else. The saami 6cm reamer would be dang perfect as well, especially if the 115 is the primary diet.
There is a thread on the site (couldnt find it) where a guy comes to conclusion to run 110 and have the bullets positioned nicely in the neck and not too deep into the case is ~ .150 FB and for the ~ .180 FBfor DTACs.
One point that was brought up with the more shallow bore was the ability to chase the lands over the length of the barrel life.
The neck length is .295 on a creedmoor. If the bottom of the bearing surface were right at the neck/shoulder, there’s miles to chase lands. The short case coupled with a long neck make that a pretty easy balance to obtain. Only reason I went as short as I did was so it would do double duty with 105 and 115 bullets. If i were doing 115’s only, id have gone saami freebore (.183) in a heartbeat.
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