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Pressure?
- Thread starter The_Whitetail_kid
- Start date
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The_Whitetail_kid
Well-Known Member
I've been reading that it is a common thing with Christensen arms. Lots of peoples do that with factory ammo
The_Whitetail_kid
Well-Known Member
Considering this is the first accurate load I've seen with the 160 AB and with a velocity like that, being such a barrel burner, I think I'm just gonna ditch the accubond and go back with the accurate, trusty, 168 Berger that I've had good results with anyway.
scpaul
Well-Known Member
Unless distance is a deciding factor try some 150 gr. bullets. Everybody makes them in all flavors.
coyotezapper
Well-Known Member
velocity = pressure
Bob Wright
Well-Known Member
3200 and a 160 bullet is smoking. The 168 VLD would be a good choice but not that much speed. Probably 2900-3000 depending on powder and accuracy nodes.
Being a 7RM did the belt grow more then .001"? Measure new cases from the same bag and compare to the ones you fired. If the belt grows .001" or more your over pressure. Either way you do have extractor marks.
More powder doesn't always mean more velocity. Pressure is what creates the velocity and some guns get there with less powder. Which is a win in todays economy.
More powder doesn't always mean more velocity. Pressure is what creates the velocity and some guns get there with less powder. Which is a win in todays economy.
scpaul
Well-Known Member
Why don't you go do a chamber cast. It's easy to do and Cerrosafe used to be available cheap from Bass Pro, Midway and all of the larger suppliers. Just follow the directions. The times need to be reasonably close for the measurements to be true. I'd do a cast all the way up to the start of the rifling just incase there's some problem there.
Can you get an acceptable accuracy result at 3150 or less to lower pressure? Anything 3000 or better is still fantastic.
My 7ss runs 160AB at 3000 with a relatively mild load of 565 and performance is great
somebody will be glad to take those 160 AB's if you sell them too
My 7ss runs 160AB at 3000 with a relatively mild load of 565 and performance is great
somebody will be glad to take those 160 AB's if you sell them too
The_Whitetail_kid
Well-Known Member
Acceptable accuracy. Not like the 168 Berger though. I think that's the bullet I'm going to go back too. Had really good results with it just wanted to play around with the accubond.
Want to sell the 160's?
The_Whitetail_kid
Well-Known Member
Sending a pm
My opinion: those are definite pressure signs. Your primers are flowing, the case heads have excess ejector wipe, and you have a sticky bolt. STOP.
I once made the mistake of assuming that a similar looking case was a fluke since I wasn't anywhere near the manufacturer's published maximum load. I shot the next .5gr increment and had a case head separation. Basically the pressure was so high the brass case ruptured in the chamber and all the gasses take the path of least resistance which is right next to your face. Turned out to be a 'fast' lot of powder. All the signs were there.
A small amount of ejector wipe is normal and acceptable to me, primers having flat or rounded edges are moot. Looks like there are no shortage of opinions... about 8 pages so far, but its your face that's next to ≥61,000PSI.
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