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Post by Lee Martin on Jul 15, 2015 21:20:40 GMT -5
Here's a new .475 bullet I designed through Mountain Molds. Its identical in scale to my .41-cal 290 and .50-cal 585 LFNs. Lubed and GC'd it'll be 445 grains:   The nose is long and in Linebaugh hulls OAL equals 1.83". My BFR cylinder measures 1.85" so it'll just fit. It also just clears my custom .475 Bisley. 0.020" is tighter than I like so I'll probably use .480 brass. I hoped to cast some last Sunday but got running on 290 gr .41's. If time permits I'll pour a bunch this weekend and post an update. -Lee www.singleactions.com"Building carpal tunnel one round at a time" |
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cmh
.401 Bobcat
Posts: 3,745
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Post by cmh on Jul 15, 2015 21:59:35 GMT -5
Nice  |
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cmillard
.375 Atomic
MOLON LABE
Posts: 1,943
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Post by cmillard on Jul 16, 2015 17:55:26 GMT -5
nice looking mold. i want to do one for my mri .500 JRH, but do a plain base instead and if possible, get 470-480 grains.
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Post by 2 Dogs on Jul 16, 2015 19:42:55 GMT -5
Lee, you always have so much neat stuff on the fire!!
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Post by Lee Martin on Jul 16, 2015 19:55:40 GMT -5
A plain base 470 - 480 gr would be very useful. Driven to say 1,300 fps and hardcast 18 - 20 HB, you wouldn't need a GC. Let us know how it progresses. I also have a 0.500" coming in August. The next Martin LFN will be a 515 gr:  It should work well in the .500 Mag and JRH (the latter on 1.35" trimmed and inside reamed S&W brass; shortening by 0.050" accommodates my longer LFN nose). As with the others, the goal is improved 100 yard accuracy. -Lee www.singleactions.com"Building carpal tunnel one round at a time" |
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Post by Lee Martin on Jul 16, 2015 19:59:32 GMT -5
Lee, you always have so much neat stuff on the fire!! Thanks Fermin. And while that fire is pretty full, the .257 Jackrabbit isn't too far down the list. But my hope is you and Alan get the first one out. I eagerly await that gun and your report. -Lee www.singleactions.com"Building carpal tunnel one round at at time" |
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Odin
.327 Meteor
Posts: 969
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Post by Odin on Jul 16, 2015 21:01:21 GMT -5
Lee,
Could you post the specs for the .475 Martin LFN? If it flies anything like its big and little brethren, I'd be sorely tempted to have Dan cut me a single cavity mold. Not that I need it, mind you. But it sure is fun to play.
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cmillard
.375 Atomic
MOLON LABE
Posts: 1,943
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Post by cmillard on Jul 17, 2015 10:14:17 GMT -5
515 grainer for .500 JRH? that would be wicked!! when is starline coming out with that new brass that wont need to be reamed? If you can get that 515 to work in the .500 JRH, I might rethink my mold
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Post by Lee Martin on Jul 19, 2015 19:48:27 GMT -5
Lee, Could you post the specs for the .475 Martin LFN? If it flies anything like its big and little brethren, I'd be sorely tempted to have Dan cut me a single cavity mold. Not that I need it, mind you. But it sure is fun to play. Sorry for the late reply. I've been offline the past few days. And I mistated the nose length above. It's actually 0.450" as designed:  -Lee www.singleactions.com"Building carpal tunnel one round at a time" |
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Post by Lee Martin on Jul 19, 2015 20:07:32 GMT -5
Hell of a day to cast bullets but I knocked out a few hundred of these 445 gr .475's (it was 94 degrees in Arlington and I cast in the driveway). In my initial post I incorrectly said the nose length is 0.430". It is really 0.450", which was intentional. Seated to the top of the crimp groove in Linebaugh brass and it's exactly the length of my BFR and custom Ruger cylinders. So I'll either shoot these in .480 or Linebaughs trimmed to 1.35". Cutting that 0.050" may seem like a waste of time but it nets another 1.5 - 2.0 grains over the 1.29" Ruger. Martin LFNs (left to right): 290 gr .41-cal, 445 gr .475-cal, and a 585 gr 0.510-cal  Halfway done casting the 445 gr:  The nose:  I also received a PM from a member asking how does my LFN differ from the traditional LBT. My changes aren't that radical but include: 1) The nose is longer but retains the 74% meplat (my nose length is in-between an LFN and Beartooth's LCMN) 2) I use a deeper and wider crimp groove 3) My driving band is a bit taller, providing better ogive support 4) I've increased the shank height to put more lube above the gas-check. This essentially yields 3 lube grooves 5) All of these are scaled the same way. Nose-to-total length = 43%. Caliber-to-total length = 45% In August I'll work the next two into the line-up. One is a 380 gr .45-cal, the other is the 515 gr .50-cal shown above. Make or break for these slugs is how they perform at 100 yards. -Lee www.singleactions.com"Building carpal tunnel one round at a time" |
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Odin
.327 Meteor
Posts: 969
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Post by Odin on Jul 19, 2015 20:29:56 GMT -5
Thanks, Lee. That lino sure does cast up nice!
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Post by webber on Jan 26, 2020 21:18:11 GMT -5
By the same scale as the .41 caliber I assume you dont mean weight, right? Here's a new .475 bullet I designed through Mountain Molds. Its identical in scale to my .41-cal 290 and .50-cal 585 LFNs. Lubed and GC'd it'll be 445 grains: The nose is long and in Linebaugh hulls OAL equals 1.83". My BFR cylinder measures 1.85" so it'll just fit. It also just clears my custom .475 Bisley. 0.020" is tighter than I like so I'll probably use .480 brass. I hoped to cast some last Sunday but got running on 290 gr .41's. If time permits I'll pour a bunch this weekend and post an update. -Lee www.singleactions.com"Building carpal tunnel one round at a time" |
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