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Oversize Bullets ? #14306375 11/23/19
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yukon254 Offline OP
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How many thousands of an inch larger than bore diameter can hardcast bullets be ? I generally aim for about .002 over, but my last batch is almost .005 over. Im casting for a new rife, BLR in 450 marlin. Havent slugged the bore yet but expect it to be .458. In my 45/70s I always shot .460 , but this latest batch is .463 on average. Are these to big?? They are powder coated. Mold is a Lyman 457163

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Re: Oversize Bullets ? [Re: yukon254] #14306406 11/23/19
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Spotshooter Offline
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You mean bigger than the lands right, not the bore ?


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Re: Oversize Bullets ? [Re: Spotshooter] #14306478 11/23/19
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yukon254 Offline OP
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Originally Posted by Spotshooter
You mean bigger than the lands right, not the bore ?


Yes

Re: Oversize Bullets ? [Re: yukon254] #14306687 11/23/19
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Yondering Offline
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Originally Posted by yukon254
How many thousands of an inch larger than bore diameter can hardcast bullets be ? I generally aim for about .002 over, but my last batch is almost .005 over. Im casting for a new rife, BLR in 450 marlin. Havent slugged the bore yet but expect it to be .458. In my 45/70s I always shot .460 , but this latest batch is .463 on average. Are these to big?? They are powder coated. Mold is a Lyman 457163


For starters - size your bullets to what you want them to be, rather than just depending on mold diameter; it's best to have them all start at the same diameter rather than varying a bit in as-cast size. Sizing irons out irregularities in the powder coating as well.

As for how big they can be - that depends on your chamber. In some, .005" over is fine. In a lot of guns though, that will be too big for a loaded cartridge to fit in the chamber. Forcing it in anyway will drive up pressures and can be the difference between a safe load and dangerous pressure. A simplified way to determine that is check your fired cases from that gun; if your cast bullets won't fit in the fired cases easily by hand, they are too big.

Re: Oversize Bullets ? [Re: yukon254] #14309530 11/24/19
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HawkI Offline
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The best possible scenario is to size as close to the throat that will chamber/function and not really consider groove diameter of the barrel.

Yondering is correct; the bullet should still drop in a fired case. The case needs to expand to release the bullet.
That shouldn't necessarily be confused with fitting the throat or snug chambering.

So long as they fall into a fired case, make them fit the throat.



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Re: Oversize Bullets ? [Re: yukon254] #14310585 11/25/19
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saddlesore Offline
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You can, for about $25, get a die and bottom plug for any diameter you need. Lee will make you one if not a std. diameter.It will screw into your standard single stage press and the bottom plug will slip into where your shell holder goes.

https://leeprecision.com/bullet-casting/bullet-sizing-kit/

You also might need a new expander plug for you dies.

Last edited by saddlesore; 11/25/19.

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Re: Oversize Bullets ? [Re: HawkI] #14310630 11/25/19
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gnoahhh Offline
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Originally Posted by HawkI
The best possible scenario is to size as close to the throat that will chamber/function and not really consider groove diameter of the barrel.

Yondering is correct; the bullet should still drop in a fired case. The case needs to expand to release the bullet.
That shouldn't necessarily be confused with fitting the throat or snug chambering.

So long as they fall into a fired case, make them fit the throat.



Absolutely. Sizing larger than groove diameter is a "by guess and by golly" approach. Measure the throat diameter and size .0005"-.001" under that. Measuring throat diameter is as easy as measuring bore/groove diameter.

When you say "hard cast" what exactly do you mean? Are you measuring hardness with a tester? For a big old .45 rifle bullet used in .45-70 and such, a bullet doesn't have to be hard. In fact, better accuracy and performance can likely be had with soft bullets in the 9-12 bhn range- without leading or resorting to powder coating either.


Last edited by gnoahhh; 11/25/19.

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Re: Oversize Bullets ? [Re: yukon254] #14359727 12/10/19
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blammer Offline
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if you can chamber a loaded round you should be good to go.

if you can't, it's too big. smile


Whatever you are willing to put up with, is exactly what you will have.

When your ship comes in. ... make sure you are willing to unload it.
Re: Oversize Bullets ? [Re: yukon254] #14440652 01/06/20
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FatAlbert Offline
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yukon254: You must be new to the rodeo? Slug the bore and then load three rounds each(with same load), bore size--- + 1---+2 and then +3 over. Total of 12 rounds. Fire them and see what you get. blammer: a case could be loaded with a bullet 20/1000" under and it would chamber but I don' think it would be "GOOD TO GO"

Last edited by FatAlbert; 01/06/20.

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Re: Oversize Bullets ? [Re: FatAlbert] #14440956 01/06/20
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gnoahhh Offline
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Originally Posted by FatAlbert
yukon254: You must be new to the rodeo? Slug the bore and then load three rounds each(with same load), bore size--- + 1---+2 and then +3 over. Total of 12 rounds. Fire them and see what you get. blammer: a case could be loaded with a bullet 20/1000" under and it would chamber but I don' think it would be "GOOD TO GO"


Okaaaay....


"You can lead a man to logic, but you cannot make him think." Joe Harz
Bravo

Re: Oversize Bullets ? [Re: yukon254] #14461564 01/12/20
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HawkI Offline
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Again, size to fit the throat.

I cast quite a bit, but I would quit tomorrow if sizing .001 an inch at a time made or broke the process for every gun, for every bullet.

Make a seal from case mouth to muzzle and go from there.



Re: Oversize Bullets ? [Re: HawkI] #14509106 Yesterday at 07:29 PM
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Dinny Offline
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Originally Posted by HawkI
Again, size to fit the throat.


Bingo! I quit measuring my bore a long time ago and just size them to slip into a once fired case neck.

Thanks, Dinny


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