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Old 02-03-2008, 08:21 PM
Beartooth Regular
Join Date: Feb 2006
Posts: 41
How to know cast bullet sizing for my rifle?

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My club requires cast bullets for shooting steel, as most shoot M/L 's and western style period rifles. I have a T/C Contender carbine in .375 win. they said I could use. I'd like to eventually start casting but not sure whose molds to go with yet. Main question I'm most puzzled about now is I'm not sure how to go about finding out the proper sizeing for my T/C?

If I order a custome sizer, I would like to get it right the first time. I did notice "Ranchdog" coming out with a 38-55 / 375 win mold but he's casting for mainly Marlin chambers, (bullets dropped are sized at .379) and I've been told my sizing might be .376 but like I said want to be sure before I do any ordering.

Thanks for the help.

Last edited by 41_Shooter; 05-09-2008 at 06:52 PM. Reason: adding to question
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Old 02-04-2008, 06:28 AM
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Join Date: Jun 2006
Location: Utah
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I bought some commercial bullets for my Contender 14" pistol. They were a plain-base 240-gr roundnose style. I couldn't shoot them any faster than 1200 fps with any accuracy at all. I think I ended up shooting a load of 8.0 Unique, or thereabouts. After I shot up the initial 100, I never shot any more lead through it, so my experience is very limited.

If you want or need any more than that, you definitely are going to need a gascheck design. A GC bullet about 240-260 grains with a flatnose or very blunt roundnose ogive would be about right.
To see my books and articles, just Google my name.
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Old 05-09-2008, 07:04 PM
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Join Date: Feb 2006
Posts: 41
What diameter were you sizing to Rock? I will probly go with the Lee sizer kit and need to order custom for my diameter, apparently. I will surely go with the gas check bullet too.

Last edited by 41_Shooter; 05-09-2008 at 07:08 PM.
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Old 05-09-2008, 10:44 PM
Beartooth Regular
Join Date: Feb 2008
Location: soda springs idaho
Posts: 158
you need to know your throat size and your bbl dimensions.
you need to either cerrosafe the front part of your chamber or use a soft lead slug to get the throat measurements.
then call ranch dog the bullet he just did id for the marlin 375.
but if your leade area is a bit longhis bullet should work fine.
i would call him and talk to him he knows his bullets, i think he wears at least one rifle out before he finalozes a design.
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Old 05-10-2008, 06:40 AM
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Join Date: Aug 2007
Location: Adams County Idaho
Posts: 439
I use pistol brass to make jackets "cast into place", This takes care of finicky barrels that will only shoot castbullets at very low velocities accurately. You can also quench your bullets by dropping them directly into cold water that has ice floating on the surface, The safest way to do this (so-as to keep a drop of water from getting into your mold) sew a couple of socks together to make a long chute! I like to coat the bases of some bullets with epoxy. I can push them a whole lot faster but this is a tedious procedure.
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Old 05-10-2008, 07:02 AM
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Join Date: Nov 2001
Posts: 6,278
I have a Winchester Model 94BB rifle in .375 and my father has a .375 and a .38-55 barrel for his Encore (that’s a story).
Inn our experiences with TC barrels they tend to have short throats and abrupt origins to the rifling. Look down the barrel from the breech and you will see the rifling “standing out” visibly. This is not a very good description but what it means is the cast bullets must be seated deeper than you think to allow the barrel to close on a loaded round.
This abrupt origin to the rifling will generally give you problems with leading in the throat (and with copper fouling in the same area) until you sort out bullet diameter and seating depth.
In the TC’s we shoot cast bullets as large a diameter as will chamber – with most mold this means – as cast and either hand lubed, pane lubed or tumble lubed. In Dads barrels the bullets seated out to touch the rifling and as large a diameter as possible seems to work best.
Marshall has some good .375 Winchester bullets and they will probably be the easiest way to start with cast bullets.
Marshall has worked with the .375 Winchester a lot but has not written about it as much as we would like. This link will get you a thread with at least on good post by Marshal.
This thread will give you a little more.

This thread has some loading data and participation by a TC shooter or two.

This thread deals with reduced loads.

This thread has some thoughts on bullet sizing from Ed Harris that are worth reviewing.

Marshal and I have different thoughts on cast bullet hardness. Marshal has more experience and I defer to him on the issue of hardness. This is an informative thread.

Here is another thread with thoughts on bullet diameter.

This thread will give you a few thoughts on throats and barrel diameters.

There is not a lot of TC data here but it should give you a start.
If you have not seen Rocky’s articles on the .375 Winchester here is a link to it. For some reason my computer throws every thing to the right and I must scroll over to read the article. I have urged Rocky to put a Reduced Load article on his list of to-do projects. The .375 is great fun to shoot with reduced velocity cast bullet loads.

After you have experimented with commercial cast bullets be sure to try the 255-grain Lee cast bullet. This bevel base bullet is very accurate in our rifles and is easy to work with. We shoot it as cast and tumble lubed or hand lubed regardless of velocity.
I may have my links out of sequence but I believe you will still find the threads useful.
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