6mmDasher help

[lee31]

I bought a 6mm dasher this spring . It's a tried 700 action with a 28 inch Bruce 1-8 twist with a side port break. The guy I bought it from said right around 300 rounds through it . I finally got a scope for it last week a Sightron 8-32x56 LRMOA . So tomorrow I'm gonna form brass and sight it in . He said he shot 32.4 grains of Varget with 105 Bergers and cci 450s . So the questions I have when fire forming do I use a milder load ? Also how far should I jam the bullets when forming? I did form one case when I first got it so I could use it for a overall case for my Stoney point . Also any other good recipes? I've heard RL-15 is a good powder also . Any input would be much appreciated.

 

[LRPV]

http://www.accurateshooter.com/cartridge-guides/6mmbrimproved/

There's a start.

 

[swd]

Here's a whole bunch on that...
http://benchrest.com/showthread.php?65506-Fireforming-6-Dasher-methods

 

[OpossumMcMuffinDave]

I would recommend at least .030 into the lands for fire forming. I thought I'd use cheep primers so I used Wolf and couldn't get them to light off. To make a long aggravating story short use federal primers for fire forming. They light off easily.

 

[Dan Hall]

lee31 use as much powder as you can get in there. Seriously, get a quality reloading manual and use the max load of the powder your using, which sounds like it's Varget because reloder 15 is harder to get. Then size the necks of you brass with a bushing that will give you a good 4 to 5 /1000s tension on the bullet and seat them long enough where you are getting at least a square mark, possibly more, on the bullets from the rifling. And as has been said use federal primers. good luck

 

[DJ111]

Just jam a 105 amax in .030 with 30.0 grains of varget, 450s, and they will shoot well.

I use a light load the second time ..like 108 berger and 31.3 grains of varget and they will shoot low 2" groups at 600. After that I go to full loads.

Good luck.

 

[SHall]

Dallas is exactly right in my opinion. I actually FF with a little lighter change on the first fire forming, just enough to get the shoulder blown out, but not quite enough to square the 40 degree shoulder out all the way. You may have to play with your charge a little, barrels are different. My FF barrel has a tight .236 bore also. Dallas is also right about the 2nd firing. That has to be a light Dasher load. I usually dont go over 32g R-15 which is about equivalent to his Varget load. Reason being, if that brass gets hammered on the first or second Fireforming, the primer pockets will start opening up early. Your brass will last for 4-5 firings instead of 15-18. Samuel Hall

 

[johara1]

If i were fire forming i would use a primer like a Federal that has a thinner cup to lessen the chance of firing pin pushing the case forward. I have had the best luck with 30 - 30.5 gr. of Varget and a 108 or a 115 Berger in a clean dry chamber yields 1.550 - 1.553 blow lengths…….. jim

 

[Jet]

Lee

For the first fire form load I use 30.5gr of Varget. Previously when I have gone above that I get split shoulders on 5-10% of cases.

Good Shooting

Rich

 

[Gabe22BR]

I use the false shoulder method using 12 grs. of unique stuffed full of paper towels, then I seat a 105 A-max out to jam it on top of 32grs of RL15, using 450 primers.

 

[rifle48]

Dallas

Do you lube the case for the first firing? Or maybe its not necessary

 

[DJ111]

Dallas

Do you lube the case for the first firing? Or maybe its not necessary

I use a dry chamber like Jim says above with dry cases as you want them to grip your chamber.

I do anneal mine before I fire form them, the last 100 I did I lost 2 cases. I found I personally get longer blow lengths from just jamming bullets then I did with using the false shoulder method and jamming.

 

[johara1]

I anneal first, I had as high as 90% failures at the shoulder on one lot, till i annealed. You should use a dry chamber and wipe the loaded rounds and chamber with non chlorinated brake cleaner. I can adjust my length by the powder charge, I do one at a time till i get the right combination, then about 5 at a time once the barrel gets warm they will get shorter. I like to do my fire forming in the winter, out the basement door into the ground, i don't try to shoot them on a target, i'm trying to make the best cases i can and my main concern is uniformity not poking holes in a target………. jim