7BR with cast boolits

[PhilC]

It's 1:9, finished prepping remainder of my brass this afternoon. Back to waiting for another weather window as snow returns Thursday/Friday, then an arctic front moves in Sat night, highs drop to mid to upper teens and overnight lows near zero through at least middle of next week.

Good to hear your mold arrived, look forward to updates!

[charlie b]

You'll have the same problem with velocity that I will (1:8 twist). 2000fps will probably be fine. Will experiment a bit to see how fast it will hold up.

My 1:10 twist .308 holds up to just under 2100fps depending on powder being used (slower is better in it with heavy bullets).

[PhilC]

I spent a lot of time researching CBA match reports for 6BR & 30BR, powders, primers, molds, twist rates, charge weights, alloys, velocities, and resultant groups. I focused on the competitive averages and used that info in my decision process and in running variables in QuickLoad.

From that, I was "pretty sure" ~2000fps was going to be a sweet spot, sure seems to be so far. :-)

[charlie b]

I spent a lot of time researching CBA match reports for 6BR & 30BR, powders, primers, molds, twist rates, charge weights, alloys, velocities, and resultant groups. I focused on the competitive averages and used that info in my decision process and in running variables in QuickLoad.

From that, I was "pretty sure" ~2000fps was going to be a sweet spot, sure seems to be so far. :-)

I think the CBA website might be one of the most used resources I have. The other (for jacketed) is the International Benchrest site.

Yep, I find that my most accurate loads in the .308 are 1800-2000fps. My go to load right now with the 210gn bullet is 1950. The bonus is that long bullet is good for 500yd ranges. It is a little too slow for 600yd.

I'll be starting at 1900fps with the 6BR and work up until the groups enlarge, then back off 100 or 200 fps.

[PhilC]

Settled on a powder yet, Varget maybe? Was either the most popular, or 2nd most, in my research for 6 & 30BR. I couldn't find any at the time but am not displeased with my results using N135 which was another frequently used powder.

[charlie b]

I will start with Varget. Depends on if I can reach the right powder density with it. My .308 cast does good with several different powders, including Varget.

[Fuj']

Phil.....What is the length of your bullet, and what bullet profile ??