Finally over pressured one

[pbroski]

140g accubond over 54.7 of staball 6.5

According to GRT at 32deg and 22" barrel, the velocity would be about 2700 fps and max pressure would be 49206 psi. Again according to GRT, to reach 3100 fps, it would take 63.2 grs. and max pressure would be 80060 psi. The load density would be about 100%, so that much powder would easily fit into the case and a bullet could be seated without powder compression. The extra powder would be undetectable from the feel of just seating the bullet. It's likely, one way or another, extra powder found it's way into that particular case.

What velocity were you actually getting with 54.7 grs.?

 

[Xxtavixx]

According to GRT at 32deg and 22" barrel, the velocity would be about 2700 fps and max pressure would be 49206 psi. Again according to GRT, to reach 3100 fps, it would take 63.2 grs. and max pressure would be 80060 psi. The load density would be about 100%, so that much powder would easily fit into the case and a bullet could be seated without powder compression. The extra powder would be undetectable from the feel of just seating the bullet. It's likely, one way or another, extra powder found it's way into that particular case.

What velocity were you actually getting with 54.7 grs.?

2750 -2780 fps, with a 16” barrel and silencer. This particular firearm has always run a bit faster than published fps with loads (except h4831 for some reason).

I do agree, likely culprit is an over powder charge. So far, the most probable is powder stuck in funnel. That has happened before, but I have always caught it before.

I will be looking for a funnel better sized for the 270 and 7mag, that hopefully retain a wider feed area. My current funnel is one of the ones that goes from 22-45 i think, so the feed area is small.

 

[sndmn11]

2750 -2780 fps, with a 16” barrel and silencer. This particular firearm has always run a bit faster than published fps with loads (except h4831 for some reason).

I do agree, likely culprit is an over powder charge. So far, the most probable is powder stuck in funnel. That has happened before, but I have always caught it before.

I will be looking for a funnel better sized for the 270 and 7mag, that hopefully retain a wider feed area. My current funnel is one of the ones that goes from 22-45 i think, so the feed area is small.

Is there a chance some gunk could get the suppressor fouled for a shot?

 

[fuzzymarindave]

Everyone says it is bound to happen, and I while it is cliché to say, I thought it would never happen to me… I thought it would never happen to me. I keep a good process, I only do one caliber at a time, I have a digital meter, and I load in strict stages. I use a process I figured out over 10 years of reloading now.

I had to redevelop the load for my Savage 116 (110 action in stainless) 270 win as the powder of choice is no longer available so I hit the range yesterday to double test the two most promising loads from this development, so I have shot both of these loads before with no issues. I do groups of five and on shot number 9 I experienced over pressure, 32 degrees at time of event.

The bolt was difficult lift and frozen in forward position, I had to use a 2 x 4 with a small rubber mallet to complete extraction. The brass stayed in the chamber and I used a cleaning rod to push it out. Primer fell out. There were no other indications of over pressure from that shot, other than it being 400 fps faster than expected. Buy the books I was near or at maximum load, but my bullet is seated to be off the lands, which in my rifle is quite the jump.

I took apart the next round from that group and measured the powder and bullet diameter and confirmed my seater was appropriately adjusted. I have no idea what went on with that one round to cause an over pressure, but it happened. My best guess is over thrown powder charge and I did not notice.

I cleaned everything up, nothing I can see looks out of issue. I put in a sized brass with primer and fire function is working, ejection works, etc. Should I have the firearm inspected at this point? Any input?

I’d inspect the locking lugs in the receiver to make sure that they are not pushed back

 

[Xxtavixx]

Is there a chance some gunk could get the suppressor fouled for a shot?

It would present as a different problem, likely causing a baffle strike or can seperation