6 arc powders

[Plague]

Yeeyee! Watch out for that Lever with summer coming.
View attachment 1065601

Load data and temperature when this happened?

 

[HairyScandinavian]

Load data and temperature when this happened?

I'm out of town now and would have to look. I think it was likely 29.5gr LVR seated to 2.260 COAL with a 108M at 91 degrees. This is in an 18" gas gun. The other 4 rounds of the same load showed extractor and plunger marks but primers weren't blown.

 

[MCGHeel]

I have a Tikka in 6 ARC. UM chambered and installed the 20" Ace barrel. My current load averages 2744 FPS:
- 30 gr of Staball Match
- 108 ELD-M
- Starline Brass
- Federal 205M

This is the rifle and this is a 5 shot group. I'm going to work up a load for it with the 107 TMKs. View attachment 1054205

20” Howa mini starline once fired fed205, Staball match work up. First pic shots 1-2 26 gr, shots 3-4 27 gr, shots 5-6 28 gr, second pic 1-2 29 gr, 3-4 30 gr. All loaded to about .090” off lands which is getting close to scraping the magazine with tips. Coal is 2.325”. Wanting to get 2700 out of them. Shot at about 85 F roughly 120 ft above sea level. I’ll post a pic of brass later. Thinking to try 30.5 gr and if no signs load 10 to go group. Shot all these into dirt for velocity and pressure check.

Edit: 107 tmks

Edited to add pics of 29gr and 30gr brass. Anybody see anything concerning for trying 30.5gr?

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[digger]

103 eld-x with stabil match loaded with BR4 primers in starline brass. Loaded to magazine length.
Hogs here in California don’t like 6 Arc

 

[waspocrew]

Picked up some Staball match to try out - curious to see how it’ll do with 105 hybrids and 107 TMK.

 

[MCGHeel]

Picked up some Staball match to try out - curious to see how it’ll do with 105 hybrids and 107 TMK.

Shot up to 30.5gr with 107tmk. I think it’s pushing pressure. Had couple ejector swipes at 30gr out of 10 rounds fired but none in a pressure test at 30.5 with 2 rounds fired. Kinda weird. All rounds shot same time this morning. 10 round group wasn’t much to get excited. I’ll edit in a bit with pics but definitely over 2 inch group at 100. Think I’m gonna back down to 29.5gr and see if accuracy improves. If not, try some different powders. Really wanted 2700 out of my 20” Howa mini, don’t think it’s gonna happen with Staball match without pushing to the limit. Pic shows chrono data from 30 gr string. This is the first 10 round group I’ve ever reloaded, so I’m sure I may be limiting factor on some of this but was pretty happy with SD.

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