My 308 has me baffled

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westTXcrd

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First post so bear with me. Rifle is model 10 savage in 308 with heavy contour 20" barrel. I have had the gun for around ten years. It was finicky but i finally found a load she loves. LC brass, rem primer, imr 4895 @46gr. 155gr amax. Shot lights out. I did two things recently to give the ol gal a facelift, she got cerakoted. I also have a can coming (Q trash panda), so i had the barrel threaded and put on a cherry bomb break (Q's version of quick detach). Grabbed some of my loads off the shelf when I got the gun back and first round, the primer spit out. After a few more showing signs of pressure, i went back and stuffed some more trickling each etc, and still showing signs of pressure. The load shoots well still, but dangerous. Can a break change the pressure that much? also, i screwed my buddies can onto my break and had a poi shift of 7" which i thought seemed a little excesive but i am new to whisper pickles.. any ideas yall?
 
Farmerboy78

Farmerboy78

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I havent had a break do that before. Do you have any pictures of the cases? My yhm stainless can gives me a 1 mil difference, so I'd say that's probably about right. It affects the harmonics of the barrel. Was the barrel recrowned?
 
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westTXcrd

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Here's a couple
 

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westTXcrd

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7" poi shift at 100yds, i did not pay for a recrown so i am assuming it didnt happen
 
sturner

sturner

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Never had a brake cause pressure
Did it split the case too?
Do you think they got paint in the chamber?
 
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westTXcrd

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Never had a brake cause pressure
Did it split the case too?
Do you think they got paint in the chamber?
I looked, i dont see paint in the chamber, and yea that is a splitting case. Definitely the worst example, but not the only one showing stress there
 
sturner

sturner

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Dang I’d say screw the brake off and shoot it but I don’t see how a brake can cause pressure that’s way back after it gets to the brake
 
sturner

sturner

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I would take the brake off and see if a .308 bullet will go through it with ease before firing another shot. You gonna screw something up if you keep shooting it as is...like maybe you!
I agree
 
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westTXcrd

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10-4 on the danger, i already pulled the bullets on my 150+ rounds i had sitting on the shelf (pita!). The brake is proper size and all. Thanks for the help thus far yall!
 
Bravo 4

Bravo 4

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Would a bullet being squeezed (resized) through too small a hole at the end of a barrel cause the chamber pressure to spike? I’d check it anyways. And make sure you check the chamber and bore, something in it definitely can.
 

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