Back with my 6mmBR
- Thread starter ArtinNC
- Start date
ArtinNC
Gold $$ Contributor
Yes , .790 jackets Shorts . Why ?? I just measured a bullet and it is .855
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Some of the bullets are going in straight(stabilized) and some are not.......might be your 1:8 twist spinning them. Pretty fast twist for 6mm 67gn bullets. If you know your muzzle velocity,you can calculate RPM's....
may be too much for thin skin BR bullets. Good luck and stay safe.
ArtinNC
Gold $$ Contributor
That is two almost in the same hole not key hole .
Look at the bullet holes on the right side noted as 31.5gn & 31.8gn & 32.0gn of Varget especially the bullet holes off by themselves.........bullet entry sure looks offcenter.
That's 279,00rpm's. The unstable bullets may be caused by many different things such bullet alignment in the neck if the necks have not been turned uniformly or the brass has not been fireformed properly to fit the chamber or poor seating die or crown needs work,etc. There's no hard fast rule....just do the best you know how or find out if you're missing something. Those bullets are designed for slower twist barrels.
I'm sure somebody else has fired similar bullets in fast twist barrels and can add some enlightenment.
It'd be interesting to hear.
Possibly a different style of aiming point may be of help. I have great luck quartering a diamond shape with my dot reticle. Just a thought.
Paul
hoz53
Gold $$ Contributor
Yeah- try some 105s and some Varget or N150- Berger 105 VLD Hunting would be a good one to try
NC/Br Shooter
Silver $$ Contributor
Hey Art. Those are some good groups.
Let's go shooting again. I just put another 30br together.
Let's go shooting again. I just put another 30br together.
ArtinNC
Gold $$ Contributor
In Burger Twist Rate Stability Calculator a 65gr bullet at 3100 FPC is very stable . But with my 8 twist maybe my 3100 may be a little to fast . So maybe I should be shooting some 87 or 90 grain that I have , I do have some 105s but just to punch holes in paper ,I would rather use lighter IF I could .
ArtinNC
Gold $$ Contributor
My seating die is a custom die made with my reamer and a Wilson micro stem top . My chamber is .272 no turn but I did turn to clean them up , and only size half the neck , to make sure the brass is lined up in the chamber . I'll try some 90 gr next . Thanks for the comments.
ArtinNC
Gold $$ Contributor
You shoot after work ? I can be there any time I think . Have to get some more loaded . I don't like the two groups I shot that were .297 and .351 . It should be in the low .200 all the time .
Trigger-Jerker
Silver $$ Contributor
Berger 90gr BT or Sierra 95gr MK would be solid choices to try.
NC/Br Shooter
Silver $$ Contributor
I'll hit you up tomorrow if you want to go. I got two guns needing to be sighted in.
Thauglor
Silver $$ Contributor
I don't see any oblong holes, only the camera angle showing one side of the bent paper petals and not the bottom, but again that isdue to the camera angle
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