Blown primers...overpressure
08-16-2009, 04:15 PM
#11
Giant Nontypical
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Went out and checked the rest of the primed brass...picked one up and the primer fell out...thinking that's my problem...
08-16-2009, 04:24 PM
#12
Giant Nontypical
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08-16-2009, 05:33 PM
#13
Giant Nontypical
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I'll back them off the lands even more and try some more. I believe your Gibbs and my Ackley but don't really show pressure signs until too late, right? Isn't that a trait of the AI rounds?
08-16-2009, 05:56 PM
#14
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I believe your Gibbs and my Ackley but don't really show pressure signs until too late, right? Isn't that a trait of the AI rounds?
08-16-2009, 06:52 PM
#15
Giant Nontypical
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jeep,
went through the exact same thing with my 6.5, ruined cases by the hundreds trying to get the velocity where the smith and several other guys said it should be.
Keep'em at least .010 off the lands, (.020 is better) and then rework the loads, you'll get higher velocity with way less pressure signs.
I went from ruining cases at 3000 fps with 60 gr of RE22 behind a 140, jammed .006, to 3280 w/ 61 gr re22 and get 5 loadings to the brass, cut the throat out .075" and now get 3340 with the same load.
RR
unless your boltface is cut up, it'll be ok, but lube the bolt lugs with grease if your gonna run it hard with high pressure loads.
went through the exact same thing with my 6.5, ruined cases by the hundreds trying to get the velocity where the smith and several other guys said it should be.
Keep'em at least .010 off the lands, (.020 is better) and then rework the loads, you'll get higher velocity with way less pressure signs.
I went from ruining cases at 3000 fps with 60 gr of RE22 behind a 140, jammed .006, to 3280 w/ 61 gr re22 and get 5 loadings to the brass, cut the throat out .075" and now get 3340 with the same load.
RR
unless your boltface is cut up, it'll be ok, but lube the bolt lugs with grease if your gonna run it hard with high pressure loads.
08-16-2009, 07:28 PM
#16
Fork Horn
Join Date: Feb 2009
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Ridge:
OK. That makes sense to me.
JeepKid: Looking forward to your report.
Pete
f you give the bullet a lil jump, seated deeper on the same load, as soon as pressure starts, the bullet starts to move if pressure in a sharp upward curve the bullet doesn't stop against the lands but has a smooth transition and gets faster quicker while pressure is still building instead of the pressure peaking trying to get the bullet moving and ruining cases.
JeepKid: Looking forward to your report.
Pete
08-17-2009, 02:24 PM
#17
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I'm also thinking that by seating the bullets so far into the case that it might also be causing a pressure spike. I think I might make them a little longer then try to work them up again...
08-17-2009, 04:53 PM
#18
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Right now I'm jumping .097, and the bullet is really deep in the case. Could that be a problem by itself?
Also wondering if the magnum primers could be causing something weird?
Also wondering if the magnum primers could be causing something weird?
Last edited by jeepkid; 08-17-2009 at 05:40 PM.
08-18-2009, 01:23 PM
#20
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OK, have read alot of reports about heat sensativity of RE22, if you've shot the load before with no problems, then in August you start having pressure problems I'd look into that.
In the gibbs when I was blowing primers by the handful, it was summertime and it was RE22. have you checked MV's lately?
here's a link of some AI/105 gr loads, but they don't list RE22
http://www.reloadersnest.com/query_b...lletWeight=105
maybe you can find something here that you can use.
RR
In the gibbs when I was blowing primers by the handful, it was summertime and it was RE22. have you checked MV's lately?
here's a link of some AI/105 gr loads, but they don't list RE22
http://www.reloadersnest.com/query_b...lletWeight=105
maybe you can find something here that you can use.
RR
MV started at 3400, now it will be down around 3250...
