Does PP Help Keep Accuracy at Jacketed Velocities? - Graybeard Outdoors
 
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post #1 of 6 (permalink) Old 04-09-2015, 11:09 PM Thread Starter
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Default Does PP Help Keep Accuracy at Jacketed Velocities?

I've often read PP allows us to push cast bullets at jacketed velocities... but another theory says the rotational rate of the rifling, when it causes the bullet to spin above 140,000 rpm causes shotgun like patterns.

So who's right?

Or are both right? Does a PP somehow allow us to get past the rpm problem?

I'll admit, I can't see how, but I'm no expert, and haven't tried it yet.

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post #2 of 6 (permalink) Old 06-04-2016, 09:43 PM
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Default Re: Does PP Help Keep Accuracy at Jacketed Velocities?

The short answer - yes.

Even in rifles as difficult to work with as the '96 Mauser, PP allows me to equal military ball ammo ballistics.

I still don't know for sure why it works, but it does. Takes a while to learn how to get it to work well though. Makes for a fun hobby.

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post #3 of 6 (permalink) Old 06-05-2016, 07:54 AM
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Default Re: Does PP Help Keep Accuracy at Jacketed Velocities?

Patching itself doesn't let you exceed 2,100 +/- fps, the alloy does. Linotype will allow faster velocities than will a pure or nearly pure lead bullet before it self destructs. Patching falls off as soon as the bullet leaves the barrel and serves two purposes, neither of which permits greater muzzle velocity.
1. Prevents the bullet from contacting the barrel, thus eliminating leading
2. Allows an undersized bullet to fit the barrel snugly which in turn, increases accuracy
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post #4 of 6 (permalink) Old 07-04-2016, 03:21 AM Thread Starter
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Default Re: Does PP Help Keep Accuracy at Jacketed Velocities?

Quote:
Originally Posted by Nobade
The short answer - yes.

Even in rifles as difficult to work with as the '96 Mauser, PP allows me to equal military ball ammo ballistics.

I still don't know for sure why it works, but it does. Takes a while to learn how to get it to work well though. Makes for a fun hobby.
When you say... "Takes a while to learn how to get it to work well though.".... what are the relevent lessons?

What is it that one has to learn?
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post #5 of 6 (permalink) Old 02-01-2017, 06:00 PM
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How to cut and apply patches, what all the dimensional relationships need to be, how to treat the cartridge cases, what powders work best, what paper to use, etc. There really is a lot more to getting it to work than there is with grease groove bullets, it took me years of practice before I could get reliable results. But it is well worth it if you are patient.

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post #6 of 6 (permalink) Old 02-20-2019, 09:22 AM
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Quote:
Originally Posted by flmason View Post
I've often read PP allows us to push cast bullets at jacketed velocities... but another theory says the rotational rate of the rifling, when it causes the bullet to spin above 140,000 rpm causes shotgun like patterns.

So who's right?

Or are both right? Does a PP somehow allow us to get past the rpm problem?

I'll admit, I can't see how, but I'm no expert, and haven't tried it yet.

Well first off, there is no rpm problem, never has been. There is an alloy problem when one wants to go jacketed speeds in standard gun barrels and fails to get accuracy with a cast lead alloy bullet. That rpm number someone yanked out of their rear only signifies the neighborhood of where things go from easy to a bit more difficult, that's it, that's all, nothing more.

Standard squeeze and grease cast bullets beat that rpm hypothesis bull excrement all the time. Some people just cannot get past cast bulletology 101 and then move on to cast bulletology 111, so they invent reasons/excuses for their failures instead of learning why they failed. The "big secret" to beating the rpm theory bs is nothing more than choosing the proper alloy for the requirements needed. THAT'S IT

What paper patching does is allow you to use an inferior alloy at higher speeds/pressures without going to a TOUGHER alloy. Notice I did not say softer/harder alloy in that sentence. You can have a hard and weak alloy and you can have a relatively soft yet tough alloy. The trick is knowing when to use what, and how to make said alloy, that's basically all there is to it.

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