Pressure? Or not?

hadjii

Qso, the bottom pic shows a 5 shot group I shot with my 6.5-05. Bullet was Speer Gold dot 140 gr. Powder was 48.5 grains of Supreme, and primer was cci200. The top pic is of the brass from the 5 shot group. My question is this: does the primers appear to be exhibiting signs of high pressure?

Grunt2

Looks good to me...the five shot group...at what distance?

hadjii

100 yards

nononsense

hadjii said:

"5 shot group I shot with my 6.5-05"

6.5-05?

No, those primers are in good shape with a slight radius still showing. Now move your scope setting up and left a little...

Did you measure the diameter just above the 0.200" mark?

Best.

hadjii

Sorry. 6.5-06. Not sure I'm following you on checking diameter. Diameter of what?

Oh. I bet you meant diameter of the case. If that's correct, I did not, but I will when I get home, and compare it to the unfired cases.

nononsense

hadjii said:

Sorry. 6.5-06. Not sure I'm following you on checking diameter. Diameter of what?

Oh. I bet you meant diameter of the case. If that's correct, I did not, but I will when I get home, and compare it to the unfired cases.

Yes, the diameter of the case just above the head which is approximately 0.200" above the base of the rim. Use your calipers to measure above the rim and scribe a light mark. Use your calipers to measure that diameter on unfired and fired cases.

Best.

hadjii

Nononsense, I measured both fired and unfired cases, winchester and peterson brand. I'm getting .002 growth between fired and unfired. Winchester or Peterson. Didn't matter. Both were the same. .466 for unfired, and .468 for fired of either brand.

nononsense

Are these once fired cases?

If yes, fire a couple of each brand two more times and measure each again.

What we're looking for is the growth of once fired compared to twice or thrice fired cases. Once fired stretches from factory undersized to chamber size and the tiny bit of shrinkage when cooling.

Best.

hadjii

Ok. I'll repost again when I get the once-fired cases reloaded and shot again, and check growth again, and then get your opinion again. Thanks nononsense. Your help is much appreciated.

Butchdog2

Looks good here.

Firing pin holes make pressure determining a little tricky as far as cratering might go. Flattened primers that look like they have been melted and poured into the case is another story. Bright marks on the case head could be a indicator. Stiff bolt, another culprit and with this symptom you might have a bright ring near the web of the case, too much stretch. I would wager you would have more than one issue if you were way too hot.

Got access to a chronograph?

nemesisenforcer

There's definitely some pressure, but nothing excessive