Making closed base bullets open based.

flying pig

flying pig

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Has anyone ever tried this? I’m thinking of machining out part of the copper jacket to expose the lead core. Reason for this is trying to fill a .287 bore with .284 closed flat base bullets. .287-.289 bullets are near impossible to source and I own a few rifles that shoot them.

Thoughts?
 
Good luck. The chances of producing bullets that weigh anywhere close to each other will approach zero. The chances of damaging the bullet bearing surface is very high, unless you happen to have a collet chuck that can accommodate such a size. It'll be extremely slow going to produce any sort of volume, if it even works at all.
 
flying pig said:
Has anyone ever tried this? I’m thinking of machining out part of the copper jacket to expose the lead core. Reason for this is trying to fill a .287 bore with .284 closed flat base bullets. .287-.289 bullets are near impossible to source and I own a few rifles that shoot them.

Thoughts?
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I had a similar thought, but not really sure whether bore sealing is really the issue or not - it might be. The rifle here has a nearly perfect 270 Win Chamber (measurements from Cerrosafe castings of it). The bore "hole" is .270" - top of rifling to top of rifling. However, the grove to groove dimension is 0.282" - so like .005" larger than one would expect in a .270 Win barrel. An astute CGN'r suggested it might have been a barrel originally made for the P13 rifle - the .276 Enfield cartridge - at least one version of which had those dimensions. The rifle is a so-called "sporter" - made and likely sold originally by BSA.

As per another CGN'r, the thing shoots like 4" groups at 25 yards with Speer, Sierra and Hornady bullets - whether boat tail or flat base - I am assuming it is not swelling up enough to seal in that barrel, so I bought some Nosler Partition bullets to try - they have a more or less open lead base to them - to be seen yet whether that resolves my issue or not. The rifle is in pieces at the moment - I was trying to discover any other reason for such horrible accuracy, but not finding anything.
 
Nosler Partitions have an open base, and if kicked hard enough would likely expand to fill your .280 Ross' bore. Worth trying the various .308" Partitions in the .303 bore as well.
 
Suther said:
I hear you can powder coat plated bullets. No idea if you can bump them up that much, but worth looking into?
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Im not sure PC will stick hard enough to a smooth polished jacket material the way it does to rough cast lead. I can say that you sure can increase the dia of your projectile if it will adhere to the jacket, I have done hundreds of cast .452 pistol slugs up to .460 for use in 45-70 or 90's (usually in 3 or 4 coatings, takes a while but the results are well worth it).
It might be worth a check on the Cast Booolit site, Im sure somebody down there has experimented with jacketed Pc slugs
 
i know this is sort of a hack way to do it but if you have access to machine tools you could bore/ream/drill and polish a .289" hole in a 1.5" long piece of 1" round stock

then turn a piece of 3/8" round bar to fit in the hole and machine a cone that is similar to the bullet taper profile (similar to a seating die)

then place a bullet in the 1" round stock hole and then put your seating die like part on top and whack it with a hammer or you can use a pressure gauge on a small press to make it more consistent then run the bullets through a .287 sizing die
 
fingers284 said:
Im not sure PC will stick hard enough to a smooth polished jacket material the way it does to rough cast lead. I can say that you sure can increase the dia of your projectile if it will adhere to the jacket, I have done hundreds of cast .452 pistol slugs up to .460 for use in 45-70 or 90's (usually in 3 or 4 coatings, takes a while but the results are well worth it).
It might be worth a check on the Cast Booolit site, Im sure somebody down there has experimented with jacketed Pc slugs
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That was my first thought too, but someone mentioned it in another thread so I figured I'd mention it here.

I do not have any experience powder coating any bullets but was shooting in a lever action shoot a couple weeks ago and the guy I was shooting with was shooting PC bullets so I was quizzing him on his process ( I do quite a bit of PC on car parts and such but have never done bullets). He mentioned that in the particular gun he was using that day, he was shooting PC jacketed bullets. If one can PC a cast bullet, there is no reason (that I can think of) that PC would not work just as well (for increasing the diameter) on a jacketed bullet and he was proof that at least ONE guy in the world is doing it with success
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https://www.canadiangunnutz.com/for...re-mistake-good-for-me.2465336/#post-20293858

I have never done it, but a quick Google search seems to suggest it's possible.
 
flying pig said:
Defeats the purpose of loading for a Mag.
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Evanguy said:
i know this is sort of a hack way to do it but if you have access to machine tools you could bore/ream/drill and polish a .289" hole in a 1.5" long piece of 1" round stock

then turn a piece of 3/8" round bar to fit in the hole and machine a cone that is similar to the bullet taper profile (similar to a seating die)

then place a bullet in the 1" round stock hole and then put your seating die like part on top and whack it with a hammer or you can use a pressure gauge on a small press to make it more consistent then run the bullets through a .287 sizing die
Click to expand...
I’ve thought about doing exactly this and will likely give it a try too.

Back at home today and going to try machining a few bullets to see if that is even remotely feasible. Machine them and weigh.
 
Look into paper patching. Years ago, in a Guns & Ammo article, Ross Seyfried wrote how he got a .275 H&H Mag to shoot by using paper patches. The .275 H&H nominally uses .287" bullets like the Ross; Seyfried slugged his bore at .292".
 
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