What method you you fellas feel is the best method to use to form 6 dasher brass. Bullet jam or false shoulder? I am hearing that the false shoulder will produce better brass with better accuracy results. I went ahead and ordered the tools i need to do the false shoulder as i think there may be some truth in what i heard. Can someone explain this a little further for all of us. Thanks fellas i appreciate your time. Lee
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Dasher fireforming methods???
- Thread starter skeetlee
- Start date
G
Greg Fowl
Guest
Dasher forming
My belief is that the only way is false shoulder. I just finished my Dasher and in my research and recommendations from top gunsmiths, that is the safest way to go. It takes awhile, but I think worth the effort. Using the jam method it is easy to blow the a-- end off the shell. BTW, mine is unusual as it is a converted 6 PPC. But it shoots, like .25 with 4895 or Re 7 and 70g SierraMk. I kept the 14 twist PPC and rechambered. Love it!!!! V/R Greg PS I will gladly discuss this off line should you desire.
My belief is that the only way is false shoulder. I just finished my Dasher and in my research and recommendations from top gunsmiths, that is the safest way to go. It takes awhile, but I think worth the effort. Using the jam method it is easy to blow the a-- end off the shell. BTW, mine is unusual as it is a converted 6 PPC. But it shoots, like .25 with 4895 or Re 7 and 70g SierraMk. I kept the 14 twist PPC and rechambered. Love it!!!! V/R Greg PS I will gladly discuss this off line should you desire.
skeetlee,
testing will easily show you that a bullet WILL not, CAN not hold the case firmly back against the bolt face. It can't resist the sheer power generated by the firing pin impulse.
A false shoulder will resist perfectly. Take care to set your firefom headspace for a snug jam-fit.
Grease your lugs!
al
testing will easily show you that a bullet WILL not, CAN not hold the case firmly back against the bolt face. It can't resist the sheer power generated by the firing pin impulse.
A false shoulder will resist perfectly. Take care to set your firefom headspace for a snug jam-fit.
Grease your lugs!
al
shoerjbh10
New member
Skeet
In response to question about fireforming cases for 6mm Dasher.
Recently I had one of my rifles Rebarreled to a Dasher.
I fireformed 55 cases with absolutely no problem.
I did not create a false shoulder
My rifle has a .269 neck, I turn the necks down to .2665
Made all length equal, reamed the inside of the case mouth just as if they were finished cases.
The method I chose was to put 31 grains of Varget behind a 108 Berger,
Then done what I think is a very important step, I sized the necks down two, .261 so I had very tight neck tension to hold the bullets in-place.
Then set my bullet 25th into the rifling.
Was surprised that it actually shot pretty good groups while fire forming (I know that's not important but it made me feel good that the barrel showed potential.)
I hope this helps
shoerjbh
In response to question about fireforming cases for 6mm Dasher.
Recently I had one of my rifles Rebarreled to a Dasher.
I fireformed 55 cases with absolutely no problem.
I did not create a false shoulder
My rifle has a .269 neck, I turn the necks down to .2665
Made all length equal, reamed the inside of the case mouth just as if they were finished cases.
The method I chose was to put 31 grains of Varget behind a 108 Berger,
Then done what I think is a very important step, I sized the necks down two, .261 so I had very tight neck tension to hold the bullets in-place.
Then set my bullet 25th into the rifling.
Was surprised that it actually shot pretty good groups while fire forming (I know that's not important but it made me feel good that the barrel showed potential.)
I hope this helps
shoerjbh
Thanks for the response. I guess what i am interested in knowing is the end results of the brass vs accuracy for the next coupe of loadings. I have formed 10 pieces of brass so far with the bullet jam method and it is working just fine. What i am worried about, is if my cases are being formed straight or are they being blow to who knows what. I had a fella send me a pm telling me about how there dasher wouldnt shoot all that well after doing the bullet jam method to fire form the cases. He then stated to say that after they went to the false shoulder the brass was more uniform and the accuracy came back, or was better. I can see were this might have some clout!! I ordered the tools to do the false shoulder so i am not going to form any more cases until they get here.
I wish i had checked into the hydraulic dies while the rifle was being made, and i still might. thanks fellas, as always, I appreciate your time!! Lee
I wish i had checked into the hydraulic dies while the rifle was being made, and i still might. thanks fellas, as always, I appreciate your time!! Lee
shoerjbh , your cases stretched, sure they fire formed beautifully but they stretched. Strong neck tension and a jammed bullet will not stop the firing pin from driving the case forwards. Kill a primer, set up the case with NO powder and a bullet seated for a hard jam, a ton of neck tension and chamber it. Remove and measure the OAL. Re-chamber it and pull the trigger on it then re-measure the OAL, it will be shorter. I tried this with 108's as well, not even remotely close to stopping the case.
I hydraulically formed mine with oil instead of water. After a lengthy, vigorous, extremely hot and soapy washing, oil film was still effecting primers until they were fired the first time. I kept them bullet down until firing and all went off unlike bullet up the first firing. When mine were H formed, a very nice shoulder to neck junction was present, the oil worked much better than water.
I hydraulically formed mine with oil instead of water. After a lengthy, vigorous, extremely hot and soapy washing, oil film was still effecting primers until they were fired the first time. I kept them bullet down until firing and all went off unlike bullet up the first firing. When mine were H formed, a very nice shoulder to neck junction was present, the oil worked much better than water.
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shoerjbh10
New member
Skeet
In responses to how well the cases form. I checked my with a concentration to gauge after fire forming.They were all within 2th.
I knew basically what load I wanted to shoot in this particular rifle
I started with test load's 31, 31.5, and 32 to grains of Varget.
First firing of cases after fire forming
31 grains to not shoot well.
31 1/2 grains of Varget behind a Berger 108 bullet set 10th in two the rifling, I've shot .251 five shot groups of 200 yd.
32 grains same setting yielded .396 five shot group of 200 yd.
Second firing of cases after fire forming with the 31.5 load I was second in a groundhog match at Shippensburg Pa.
With a score of 50 @ 200 meters 48 @300 meters 42 @500 meters
This is certainly good enough accuracy for me until I get time to test more load's
I hope this helps you
If I can help you in any way please feel free to of the contact me
shoerjbh
In responses to how well the cases form. I checked my with a concentration to gauge after fire forming.They were all within 2th.
I knew basically what load I wanted to shoot in this particular rifle
I started with test load's 31, 31.5, and 32 to grains of Varget.
First firing of cases after fire forming
31 grains to not shoot well.
31 1/2 grains of Varget behind a Berger 108 bullet set 10th in two the rifling, I've shot .251 five shot groups of 200 yd.
32 grains same setting yielded .396 five shot group of 200 yd.
Second firing of cases after fire forming with the 31.5 load I was second in a groundhog match at Shippensburg Pa.
With a score of 50 @ 200 meters 48 @300 meters 42 @500 meters
This is certainly good enough accuracy for me until I get time to test more load's
I hope this helps you
If I can help you in any way please feel free to of the contact me
shoerjbh
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