CBTO cartridge base to ogive (of bullet) = measurement for bullet jump based upon the bullet ogive. Most accurate means to measure jump versus COAL which can have different bullet lengths.
Announcing the New Hammer HHT
- Thread starter Steve Davis
- Start date
We all have one of those "what the" at some time or another.
aratliff
Hammer Time Executive member
Don’t feel bad. It wasn’t long ago that the eureka bulb came on for me vis-a-vis CBTO.
ButterBean
Hammer Time Executive member
Love my MuleThey do have a potent "kick", but can be watered down with a brake
Richcotte
Hammer Time Executive member
Nope, the standard factory mag. MT's mags don't work with Peterson 300WM Long brass. I've got one that I need to modify so I can use it.
So I haven't had time to get to range for 300WSM and 154HHT's yet. Normally I shoot in back of property BUT the recent crop of fawns are staying tight near house soooo no shooting until they start to move off property. And no, I don't have a CHOICE in this.
Range report!
Stretched out the 163HHT's to ~790 yds this morning.
G7 BC of 2.34 is pretty dang close to actual with this rifle. Might be as low as 0.230 or up to 0.240.
If I wasn't on the ragged edge of what my poor little range finder can reach to I'd be able to narrow that down further. BUT plenty close enough for my needs!
The 56.0 gr of Varget is holding under 1/2 MOA elevation at distance. Had fairly variable winds sliding down the canyon that definitely added to the horizontal spread, but reasonable and expected.
Stretched out the 163HHT's to ~790 yds this morning.
G7 BC of 2.34 is pretty dang close to actual with this rifle. Might be as low as 0.230 or up to 0.240.
If I wasn't on the ragged edge of what my poor little range finder can reach to I'd be able to narrow that down further. BUT plenty close enough for my needs!
The 56.0 gr of Varget is holding under 1/2 MOA elevation at distance. Had fairly variable winds sliding down the canyon that definitely added to the horizontal spread, but reasonable and expected.
Yep!
Here' I'll put all the details up:
Tikka 300 SAUM (SAAMI reamer)
Preferred Barrel, 24" with 9 twist (verified).
2x fired R-P Brass, Neck turned & trimmed
163 HHT
56.0 gr Varget
3.045" COAL
~3085 fps MV
1/8 turn crimp with Lee FCD
0.230 - 0.240 G7 BC based on drops
~790 yds (saw ranges between 785 & 800, so hence variability on G7 BC)
2-6 mph cross wind. variable in intensity and location in canyon where shooting.
~3" vertical spread, ~10" horizontal spread on warm bore (variable 2-6 mph cross wind). (seeing potential POI change on cold bore. Jury is still out if its cold bore, wind gust or shooter induced!)
Richcotte
Hammer Time Executive member
Jeremy,
What magazine and bolt stop are you running for the SAUM in the Tikka? Are you running it as a short action, or a long?
Long action bolt stop with standard LA magazine.
On that topic, of the 3 LA mags I have, only 1 is wide enough (internally) to fit the SAUM well. The other 2 are a bit too snug side-to-side internally and won't feed. The only difference between the mags is the one that works came with the rifle that I put the SAUM barrel on, which was originally a 300 WM.