- Jan 9, 2019
- Reaction score
- Albuquerque, NM
- Member of
- NRA Life Member, USPSA Certified Range Officer (inactive), NRA Certified Instructor (inactive)
- USA, Mexico, RSA
Just to be clear we are talking about the 6.5 Creedmoor (not the 6.5 Swede).Also, what load data is that? Vihtivouri list the 156 grain lapua mega out of a 25.5 inch barrel max (62,000psi) at just a hair over 2,500fps. Just curious, I've never seen a creedmoor data that will push so heavy a bullet from such a short barrel.
I used QuickLoad and ran the numbers for RL-17 for the 155 gr Lapua Mega. I also load the CM with 140s A-Frames using RL-17 so I had a bit of a baseline to judge by. There is very little data out there for heavy bullets in the Creedmoor - especially using RL17, but I did find some. (Though not for my specific components.)
Also of note is the Tikka T3X has a fairly long throat so I was able to seat the bullet to 2.822" (still .036" off the lands), which according to QuickLoad reduced the pressure a notable amount. This is still below magazine length, btw, in 6.5CM/7mm-08 specific magazines.
Quickload default data was also adjusted (reduced) for the actual water volume of a fired Nosler case. Prior to doing this I was getting higher Actual velocity Vs QL Projected. Very close to QL projected V after.
It appears to be safe in MY Rifle, at least in cool weather, (and well under max pressure per QL), but not a recommendation by any means:
My 6.5 Creedmoor load for the 155 Mega is 41.0 Grains of RL-17, F210 Primers, Nosler or Norma Brass. COL 2.822", Ogive 2.461 (.036" off the lands).
24" factory Tikka T3X Lite barrel.
I happened to be using new brass for the loads I ran over the Lab Radar. I ran 9, dropped one outlier and the remaining 8 averaged 2,637 fps at 66*F with an SD of 6.0. (9 of 9 averaged 2,632 fps, SD 15.8). Still need to see how they do in hot weather since RL-17 can be temp sensitive.
Edit: I would consider the 155 gr Mega load to be a 200 Yard +/- load due to the low BC.