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What makes a bullet 'blow up' in flight?

Pushing a bullet to fast. Bullet becomes unstable due to twist in the barrel/speed.

One of the guys I shoot with in fclass has this issue if he pushes his 7mm Berger’s up around 3500+

Essentially the jacket comes apart
 
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More Muzzle speed increases spin rate, an with fast twist barrels the end product can over come the jackets ability to contain the lead core. some Target copper/lead bullets, are more prone than others. Most call it turning them into pie,... much like pumpkin chucking events.
 
Pushing a bullet to fast. Bullet becomes unstable due to twist in the barrel/speed.

One of the guys I shoot with in fclass has this issue if he pushes his 7mm Berger’s up around 3500+

Essentially the jacket comes apart
I can tell you 7mm 180 eldm’s don’t like 2900+ with my 1-8 twist barrel.