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Long Range Hunting & Shooting
Velocity increase on 6 month old ammo
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<blockquote data-quote="crkckr" data-source="post: 1643820" data-attributes="member: 78056"><p>I've had some experience with cold (or worse, corrosion!) welded bullets. A buddy left a couple hundred 7.62x39mm factory ammo in his basement in their cardboard boxes and several of them refused to fire. I pulled the bullets on the rounds that wouldn't fire and found the bullets corroded into the neck, requiring some serious bashing with my inertia puller. I've also had old ammo that was cold welded but most was 10 years + in age. But I could see it happening on ammo only a year old with cases that had been cleaned well, especially cases that hadn't been cleaned with something like corn cob grit & Brasso, which leaves a film on the brass. Chemical or pin tumbling gets the cases down to bare metal and leaves them perfectly clean, setting up the bullet to case neck weld over time. Reloading is part science with a bit of voodoo thrown in for good measure and that's the part that bites at times.</p><p></p><p>To the OP, did you you have any pressure signs with the new velocities? If not, I would guess your POI might change a tiny bit but otherwise,you're probably good to go with the faster rounds, as long as they still shoot to your accuracy requirements. If they are, pulling all those bullets seems a waste of time to me... I hate to pull bullets!</p><p>Cheers,</p><p>crkckr</p></blockquote><p></p>
[QUOTE="crkckr, post: 1643820, member: 78056"] I've had some experience with cold (or worse, corrosion!) welded bullets. A buddy left a couple hundred 7.62x39mm factory ammo in his basement in their cardboard boxes and several of them refused to fire. I pulled the bullets on the rounds that wouldn't fire and found the bullets corroded into the neck, requiring some serious bashing with my inertia puller. I've also had old ammo that was cold welded but most was 10 years + in age. But I could see it happening on ammo only a year old with cases that had been cleaned well, especially cases that hadn't been cleaned with something like corn cob grit & Brasso, which leaves a film on the brass. Chemical or pin tumbling gets the cases down to bare metal and leaves them perfectly clean, setting up the bullet to case neck weld over time. Reloading is part science with a bit of voodoo thrown in for good measure and that's the part that bites at times. To the OP, did you you have any pressure signs with the new velocities? If not, I would guess your POI might change a tiny bit but otherwise,you're probably good to go with the faster rounds, as long as they still shoot to your accuracy requirements. If they are, pulling all those bullets seems a waste of time to me... I hate to pull bullets! Cheers, crkckr [/QUOTE]
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Velocity increase on 6 month old ammo
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