130 TMK 6.5CM H4350Short Barrel Vel?

[FLS]

Damn y’all have some fast rifles. My fastest 130 grain Creedmoor load only goes 2892. It takes 44 grains of H4350 and a 24” Krieger to get there.

 

[bowrunner81]

20" C6 with Scythe. Lapua brass 130tmk's 42.5gr H4350 Gm210. averaged 2912 fps thru 10 shots this am. 6.5 creedmoor. No pressure signs

Garmin chrono

I find this very interesting. I wonder if other guys with C6 barrels can chime in if they have seen some extra unexpected speed with theirs too. That’s a good 100fps faster than I would expect it to produce.

 

[HuntHarder]

I first started with a quick pressure test to see where my gun's point was. Knowing that I am going to use H4350, i loaded up 15 rounds at max mag length with the Tmks. I started at 40 grains then went .3 grains higher until I reached 43 at which point I went down to .1 higher. I made it to 43.4 grains and still don't have much pressure signs. Primers are a little flat, but no ejector marks.

I then went online and found lots of guys finding the sweet spot around 42-43 grains of H4350, so i loaded up 10 of each @ 42.5 grains and shot them all at 100 yards. All 3 loads grouped good with the VLD's grouping the best at .81" 10 shot group followed by eld-m @ 1.0" and the tmk's @ 1.2". None of these rounds showed any pressure signs.

Speeds were:
Vld's@ 2911fps, ES of 20 fps
Eldm@ 2901 fps ES of 54 fps
TMks @ 2912 fps. ES of 81 fps

The rifle only has 62 rounds thru it so far but I am leaning toward the VLD's. I currently loaded up 30 Vld and 20 more ELD-m's that I'll try and shoot next week at 200 yards. After that, I'll likely choose between the 2 and start validating bullet drop at longer range.

 

[Bluumoon]

I find this very interesting. I wonder if other guys with C6 barrels can chime in if they have seen some extra unexpected speed with theirs too. That’s a good 100fps faster than I would expect it to produce.

Garmin vs dropped checked dope on my 22CM was 100fps different last week.. Highly likely I was doing something wrong though.

 

[jamesmc8]

Factory Tikka chopped to 17.5" - LOAD: 130 TMK 41.5 H4350 - 2640fps