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Airgun .308 bullet shape - Page 2 - Mountain Molds

Airgun .308 bullet shape

Pinzgauer
Posts: 7
Joined: Tue May 27, 2008 7:31 am

Re: Airgun .308 bullet shape

Postby Pinzgauer » Tue Oct 13, 2009 6:21 pm

OK...no pointy bullets. :(

Now just to push it a little :D can you make a bullet mold with a hemispherical nose? Our thinking is that the flat meplat is bad for accuracy at the velocity we are shooting them at (850 - 950 fps).

If I have struck out on both counts and your CNC set up cannot do the pointy or hemispherical noses, could you suggest a competitor that can cut molds with a cherry to such a shape? It is fine to reply by private mail - mbarna at chartermi dot net

Kindest regards,

Mike Barna

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mtngun
Site Admin
Posts: 1638
Joined: Fri Feb 01, 2008 5:45 pm
Location: Where the Salmon joins the Snake

Re: Airgun .308 bullet shape

Postby mtngun » Wed Oct 14, 2009 8:01 am

Everything that I can cut is available in the online design program.

I don't plan to cut any more molds for airguns, however.

Any custom mold maker should be able to make a pointy or round nose mold. Paul Jones, Brooks, Old West, Lee, NEI, and probably a few more that I can't remember off the top of my head. There is a glut of custom mold makers.

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mtngun
Site Admin
Posts: 1638
Joined: Fri Feb 01, 2008 5:45 pm
Location: Where the Salmon joins the Snake

Re: Airgun .308 bullet shape

Postby mtngun » Sat Nov 28, 2009 2:36 pm

Well, I wasn't paying close attention and let someone slip in an order for what appears to be a 30 caliber airgun bullet, cast of 30:1 alloy.

As has been discussed on other posts, the force of cutting the sprue distorts the bullet base. My sprue plates are not designed for the combination of 30 caliber and black powder alloy (on the other hand, 30 caliber and wheelweight is no problem, since wheelweight sprues cut easily).

Here are the measurements of the base with 30:1 alloy. The spec is supposed to be 0.306" - 0.308":

0.3031"
0.3038"
0.3042"
0.3043"
0.3047"
0.3053"
0.3056"
0.3060"
0.3061"
0.3068"
0.3072"

We have a 0.0041" spread. Lotsa luck shooting that bullet.

The cavity is machined correctly, it's just that the sprue cutting force is pushing the base to one side, resulting in a pronounced egg shaped base. The only solution would be to make a custom sprue plate with itsy bitsy sprue holes, and that's not gonna happen. :evil: If you think making custom sprue plates is quick and easy, THEN YOU DO IT ! ! !

This mold will be shipped out this way. I don't feel responsible because my job is to machine the mold correctly, and I did that. I have no sympathy with the problem. This subject has been discussed over and over......... it may be that the only solution is to eliminate all alloy choices except wheelweight. :cry:

turbo1889
Posts: 12
Joined: Wed Feb 18, 2009 8:53 pm

Re: Airgun .308 bullet shape

Postby turbo1889 » Mon Nov 30, 2009 7:31 pm



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