Why is my brass showing high pressure signs?

[Big Cholla]

IMHO, you have the 'recall' problem in spades. Look at the first round fired on the left. It is obvious to me that the hammer nose has driven into the primer very deeply. Now, look at your two 'overloads'. The hammer strike point is protruding backward into the hammer bushing hole for the hammer nose. That indicated to me anyways that the strike of the hammer nose is driving the cartridges forward and deeper into the oversized chamber and extractor cut that was cut too deep. That allows the cartridge to be forced rearward at some high rate of speed up against the recoil shield of the revolver. IMHO, that give you the symptoms of excess pressure that you see. In other words your chambers are not correctly cut. Send it back with those fired cartridges. It will be returned fixed and able to handle your load. ....... Big Cholla

 

[sbeatty1983]

IMHO, you have the 'recall' problem in spades. Look at the first round fired on the left. It is obvious to me that the hammer nose has driven into the primer very deeply. Now, look at your two 'overloads'. The hammer strike point is protruding backward into the hammer bushing hole for the hammer nose. That indicated to me anyways that the strike of the hammer nose is driving the cartridges forward and deeper into the oversized chamber and extractor cut that was cut too deep. That allows the cartridge to be forced rearward at some high rate of speed up against the recoil shield of the revolver. IMHO, that give you the symptoms of excess pressure that you see. In other words your chambers are not correctly cut. Send it back with those fired cartridges. It will be returned fixed and able to handle your load. ....... Big Cholla

Thanks, actually the Fed Ex man picked up my gun today. I sent a note detailing the problem.

 

[blujax01]

...BTW, that bullet is the Remington 125gr, one of the better cup/core, old school designs.

Yep, SJHP. Here's the same bullet in 158 grain.

And no offense meant but are you certain your scales are accurate?

 

[snowman]

Thanks, actually the Fed Ex man picked up my gun today. I sent a note detailing the problem.

Sir,

Please let us know the outcome of this situation, and the correct diagnosis. The responses here vary widely and it would help us to know the actual problem once you find out.

Thank you,
Andy

 

[AABEN]

sbeatty,

296/H-110 are not powders to load light. In this case "Light" means anything more than 3% reduction from maximum. This is Winchester's recommendation, not mine! Current Winchester data calls for 22 gr. maximum for the 125 gr JHP. The starting load on Hodgdon's site, 21 gr, is actually lower that the Winchester recommendation when they were still the distributor of 296.

The reason for this recommendation is that 296/H-110 can exhibit erratic burning, both squibs and extremely high pressure excursions can result. With your 19 gr. load it appears you are experiencing high pressure excursions at times. My recommendation is to dismantle these and, if you want lighter than full power loads, reload the bullets with Universal, Unique, 4756, HS-5, or any of several others in he medium burning range. 2400 can be reduced with no problems too.

Thia man has it wright! You are loading to lite