Firearm & Gun Forum - FireArmsTalk.com > Gunsmithing & Do-It-Yourself Projects > DIY Projects > Big Thunder II Vs. Fenrir: The 1911 .460 Rowland Build Off

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Old 03-07-2010, 01:13 PM   #221
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Just looked at the picture of your 460 cor bon ammo. That's suprising that the 45 acp Cor bon Dpx velocity is not that much different from the cor bon 460 rowland. I believe the Cor bon dpx runs a little over 1000 fps.

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Old 03-07-2010, 10:34 PM   #222
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Just looked at the picture of your 460 cor bon ammo. That's suprising that the 45 acp Cor bon Dpx velocity is not that much different from the cor bon 460 rowland. I believe the Cor bon dpx runs a little over 1000 fps.
Yea but it's not throwing a 255 gr bullet. The 185 gr Georgia Arms is >1550 fps with near 1000 # ft of ME. This is the round that comes close to 44 Rem Mag numbers from a 8+1 autoloader!
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Old 03-08-2010, 10:07 PM   #223
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Good News! Jim at Buffalo Bore ammo says he will be adding some loadings in 460 Rowland in a "few months". It seems the Rowland is gaining in popularity.

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Old 03-08-2010, 11:15 PM   #224
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yippee..............

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Old 03-09-2010, 01:41 AM   #225
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Yea but it's not throwing a 255 gr bullet. The 185 gr Georgia Arms is >1550 fps with near 1000 # ft of ME. This is the round that comes close to 44 Rem Mag numbers from a 8+1 autoloader!
canebreak:

When I first became interested in the .460 conversion, It was because I was given the impression at that time that ALL of the commercially available (niche) loaded .460 ammo was very close to the same power as the .44 Rem. Magnum.
Now after reading your post above, I get the feeling that, maybe this is not the case?
cane can you fill me in, do all of the full power loadings at least top the hot commercially loaded 10MM/.41 Mag., how much of a power advantage over these 2 (10/.41Mag.) cals. is there for hunting?

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Old 03-09-2010, 01:24 PM   #226
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It goes 44 mag, than 460, then 10mm.

460-ballistics.jpg  
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Old 03-09-2010, 01:30 PM   #227
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Keep in mind Georgia Arms has a 460 rowland 230 grain that runs 1350fps, this closes the gap on the 44 nicely.

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Old 03-09-2010, 03:18 PM   #228
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It goes 44 mag, than 460, then 10mm.
gadrooning:

Thank you very much Sir for providing me W that ballistic comparison table, very very cool!


OK. So it goes.44Mag. .460R 10MM/ does the .41 MAG. now fit in above the 10MM or just equal to it?

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Old 03-09-2010, 03:30 PM   #229
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I would say the 41 mag is closer to the 460 than the 10mm.

14-mag.jpg  
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Old 03-09-2010, 05:14 PM   #230
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Cane did I read your post right? You put in a 14# spring in the Fenrir???? I run a 20# spring in mine and have no problem, but I always assumed that running anything lower would damage the gun, so I have never tried. Is the 14# a permanent fix for fenrir. No issues?
Note: be sure you have the CCG HD firing pin spring installed! That's a whole other issue that MUST be correct with the installation of the CCG kit. Ask me and I will address that issue later.

Is your donor gun stainless steel? Is it a Colt? It seams the Colt tight fit, and the increased coefficient of friction of the Colt SS alloy (which is designed for the 45 ACP pressures) causes issues with timing when cycling the 460 Rowland.

I worked with Clark to fix my FTE issue by starting with an inspection of the extractor, no problem. Then moved to the ejector and found no witness mark of contact on the brass. This simply means the slide is not cycling totally to the rear, contacting the ejector and kicking the spent cartridge out. No full slide travel = too much resistance.

I then preformed the slide to receiver lapping. (220/320/600) This took some time and effort but produced an incredibly smooth slide cycle. This improvement did not completely eliminate the FTE. The ejector witness marks were light if evident so the next step was to step down the recoil spring pressure.

I went from 24# to 22#, then 18.5# and when I got down to the stock 16# I was told by Clark that they can't recommend I go any lower. (wink, wink - CYA) I was seeing fewer FTEs but was not satisfied with Fenrir as a dependable PD weapon. My next step was to use a 14# ISMI Chrome Silicon Recoil Spring which is typically the spring used with the 38 super and 9mm 1911s.

Presto! Fenrir has run flawless after this last change. When gorknoids was down we ran ~50 rounds through her sans incident!

So to answer your question, yes the 14# spring is my fix for now. I think if it wears in some more I will try to go back up to 16# just to slow the wear. As of right now, with ~100 rounds through her with the light spring I see no accelerated wear. I do keep a close watch on this.

IF YOUR SET-UP RUNS WITH THE 20# SPRING, DO NOT CHANGE!

If it runs, don't touch it!
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