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by mtngun
Thu Feb 14, 2008 6:03 pm
Forum: design & sizing
Topic: correct size for a 480 Ruger
Replies: 4
Views: 4055

Re: correct size for a 480 Ruger

My 450 has been doing real well with JB's Crater Lites with a 0.400 nose to crimp. Groups in the 1" to 1 1/4 range at 100 yards. I recently tried his 420 gr Crater Lite-2's. I believe they're more of a bore rider type as they have a 0.459 dia. band, 0.080 long above the crimp groove. These bull...
by mtngun
Thu Feb 14, 2008 6:00 pm
Forum: design & sizing
Topic: correct size for a 480 Ruger
Replies: 4
Views: 4055

Re: correct size for a 480 Ruger

The 480 -- size to fit the throats. You may want to make the front band two or three thou smaller, or better yet, put a step on the nose so that the nose will not interfere with chambering. Be aware that not all guns will chamber a throat diameter bullet because the case mouth OD may be too large. F...
by mtngun
Thu Feb 14, 2008 5:58 pm
Forum: design & sizing
Topic: correct size for a 480 Ruger
Replies: 4
Views: 4055

correct size for a 480 Ruger

from the old forum: Hi all, I'm just getting into casting and have several questions on bullet design. I will eventually be casting for my 450 Marlin GG and 480 Ruger SRH. I currently use both Cast Performance and J.B. Young gas checked hard cast. The 45 caliber bullets are 0.459" and the 475 ...
by mtngun
Thu Feb 14, 2008 5:50 pm
Forum: absolute truths
Topic: minimum band length
Replies: 0
Views: 5069

minimum band length

The online design program has been changed so that it does not allow small bands on big bore bullets. Tiny bands are difficult to fill out. The new minimum band length is 15% of bullet diameter or else 0.050", whichever is larger.
by mtngun
Thu Feb 14, 2008 5:48 pm
Forum: absolute truths
Topic: typical designs dropped
Replies: 0
Views: 5548

typical designs dropped

from the old forum: The "typical designs" have been dropped. They were always intended to be temporary, to help make the transition to the online design program. I originally planned to keep them around until the "save" function was added to the design program, but that is takin...
by mtngun
Thu Feb 14, 2008 5:40 pm
Forum: revolvers
Topic: Bore riding nose for 510 grain in 500 S&W ?
Replies: 3
Views: 4764

Re: Bore riding nose for 510 grain in 500 S&W ?

As you know I have many of your SW 500 and 475 moulds and I prefer 2 lube grooves ,3 would be even better especially at the pressure generated by the SW 500 and 475 Linebaugh and 475 Maximums.Leading begins when I have 2 small grooves or less. I have a 495gr mould noselength .389,and I have a 515gr ...
by mtngun
Thu Feb 14, 2008 5:39 pm
Forum: revolvers
Topic: Bore riding nose for 510 grain in 500 S&W ?
Replies: 3
Views: 4764

Bore riding nose for 510 grain in 500 S&W ?

from the old forum: I was asked about a Ross-style 510 gr. GC bullet for the 500 S&W. John Ross really likes the long nose design because it frees up more powder space. It makes sense for the very heavy bullets. However, the 510 gr. version as shown below has very little full diameter bearing l...
by mtngun
Thu Feb 14, 2008 5:36 pm
Forum: revolvers
Topic: light bullet for 44
Replies: 6
Views: 5305

light bullet for 44

From Bass Ackwards about a bullet he nicknamed "Katie": You might not remember, but I did a 225 grain 44 caliber bullet with only a GC groove for lube. I think I have shot it enough that I can say that short bullets don't fly well at longer ranges. And .... short bullets don't like faster ...
by mtngun
Thu Feb 14, 2008 5:33 pm
Forum: pressure measurement
Topic: does the spike go away when you shorten the barrel?
Replies: 4
Views: 4082

Re: does the spike go away when you shorten the barrel?

Changing the barrel length changes the vibration patterns and critical frequencies, yet the secondary spike never went away.
by mtngun
Thu Feb 14, 2008 5:32 pm
Forum: pressure measurement
Topic: does the spike go away when you shorten the barrel?
Replies: 4
Views: 4082

Re: does the spike go away when you shorten the barrel?

This data was given to me by someone who wishes to remain anonymous. Don't ask, don't tell. The important thing is, we have some good data. The usual ammo -- 30-06, 165 gr. jacketed validation load and 180 gr. cast spikey load. http://www.mountainmolds.com/pics/3006_5_11_05_1.gif Note the primary pr...

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