I can do a buy on any design but, there must be 10 people, per buy. The prices for 2 cav molds (no single cav) in a buy is:

$67 for aluminum
$86 for brass

I wouldn't be included with the RL because I already have one. I couldn't include myself on the pictured PJ either as, I don't have the twist rate.

I thought that it might be easier to get 10 buyers over the 3 caliber range especially since 30 caliber and 33 caliber are harder to come by.

Frank

JLouis wrote on Jul 17^th, 2015 at 6:24pm:


John,
Don't take my word for it, ask some of the other machinist on this form that have run CNC machines but, here is my answer to your question:

The reason that inturpolation will work and have no run out in mold making is because when doing so, the HSS cutter is very stiff for it's lenght and will brake, rather than bend when cutting but, the main reason is that you have at least 6 cutting edges in a modern cherry and the chip load is very light when doing it this way. You can not create enough load to deflect the cherry if the feed rate is right. It will actually machine a more accurate cavity. The machine movement is complicated but, because it's computor generated inturpolate will give a exact circle and a excellent finish.

Frank

oneatatime wrote on Jul 18^th, 2015 at 5:50pm:


That's great, bwdog, you and I, that's three down, seven to go

Regarding the second cavity, he has never offered 2 different molds in the same cavity. I'll ask about it if I can get this going.

Frank

Put me down for a .322 Ron Long 32 cal. please. 
Scott

For those who's needs can be met by a stock bullet, this thread offers an number of good options. If your needs are particular to an individual rifle, there is more than one way to skin a cat. For those individual needs, a custom bullet mould is the way to go.
I have purchased more than a half dozen moulds for various rifles from Steve Brooks of Tru-Bore Moulds and have been pleased with all of them. I recommend if you are considering a custom mould that you make a chamber cast with CerroSafe and measure it so you get a bullet that fits your rifle properly. Brook's moulds are lathe bored and he delivers in about a month, sometimes less. He uses iron blocks with three alignment pins and heavy sprue plates.
His moulds are not cheap but they will outlast your shooting career unless mistreated. For details, check out his web site:
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I also have a mold made by Steve Brooks. I sent Steve a drawing, to make to my specs. It cost over $200 with shipping and was NOT made to the specs that I requested. It ran .0005 to small at the base band and .001 to small at the first band. He offered to remake it but, I declined hoping that (by chance I guess) that I could get it to shoot. Had it been to large in those same areas, it might have worked. He does make high quality molds and is the best custom mold maker, at this time.

The idea behind these molds is to offer a way to fit a tapered mold to a much larger range of barrels and chambers. A .002 - .003 taper is standard in BSed bullets. I've not found the configuration of the throat to be of any importance to accuracy, other than the amount of pressure it takes to BS the bullet. I have standard 32/40 chambers, freebored throats and Schuetzen throat ( no neck and 30 deg in front of the case mouth) they all shoot at the same level of accuracy. 

The taper is to help center the bullet at the start of BSing and to reduce the amount of pressure to put it at the BSing depth that you choose.

The base band is also extremely important and MUST seal the throat and this is where the design is important. With these molds it makes it much easier to get a bullet that will seal the throat and fill the groove of the barrel as well as a custom tapered mold will.

Many custom molds don't use the ogive as a supporting feature of the bullet. It will be bore size or smaller. This one uses the ogive to help support and align the bullet. Custom mold makers that cater to our sport, don't use radi grooves because they can't do that w/o using a CNC lathe. Radius grooves make the bullet stronger. 

These molds cost 1/3 what a custom mold will cost and that means you can buy two (.321 & .323) and still have about $70 left over.

Not to mention that new shooters, usually don't want to spend over $200 for there first mold.

Frank

Well John,
That is your opinion. I believe that your one of the few in the nation that shoot non-tapered bullets. 

The nose of a bullet tapers much more than the body, if your concerns were true, the nose of all bullets would make them inaccurate, unless you shot wad cutters.

You might note the accuracy record of the PJ mold that's pictured in this thread. at least a few of the 1240+ scores (50 shot match) were made with that tapered bullet.

That said, I have nothing against cylindrical bullet, I shoot one in my 33 ELCO but, you have to be careful about their fit. They can't be larger than the groove or it takes to much pressure to seat them but, they can be .001 smaller. When you seat them, the lead displaced by the lands will extrude radially, also. Along with that, you may still have the problem with getting the base band large enough to fill the throat and seal it.

They have their same basic problems but, IMO the tapered bullet will get it done with less fuss.

BTW, I can't really believe that your not trying to be argumentative. It seems that no matter what I post, you have some problem with it. The majority of competive shooters, today shoot tapered, spitzer bullets. I really don't see your point or even many cylinderical bullets winning the most competitive matches.

In this thread, I'm trying to make obtaining a accurate bullet mold that has adjustability for different size barrels, available at a extremely good price. Something that you say that you try to do in making this sport more affordable to new shooters. Do you have a way to make accurate bullet molds more affordable for new shooters?

Frank

For the record I never said a tapered would not shoot good Frank they do indeed shoot very well. What I did say was based on my personal experience a cylindrical bullet has consistently shot better for me and may do so for others?