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404-375 Now with pics!
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Hey Boomy,

I thought you might want a flanged version of your .423/.375 to go with your belted version so here it is.

The Chamber:

The Cartridge:

I’d think this could be built on the same frame as the standard .375 Fl. Mag. N.E.? If it so ought to make a nice light trim free swinging DR. Also would make an equally nice single shot.

I did run QL for the .423/.375 Fl. Mag N.E. with its 47137psi Pmax (MAP) and was able to run the 2150fps – 2200fps with a 24” barrel length using the 400gr CEB Safari Solid, the slightly shorter 387 GSC FN was worth another 50fps – 75fps at the same pressure level. I ran the matching 375gr CEB Safari Raptor which easily produced 2300fps. I did not run any of the lighter weight CEB brass bullets nor did I run any C&C bullets.

For a longer ranging copper HP spitzer bullet, I ran the 320gr CEB MTH Multi-Band and the 320 GSC HV, both easily produced 2500fps at identical pressure.

I reckon one would have to identify the optimum loading since it’s primarily for a DR. So what to use? Not sure so since it has a 24” barrel, and the barrels will be thin compared to a bolt or single-shot rifle I’ll try “barrel time” which for the above Pmax settles down to Node 7 or 1.434ms. And yes I played with 25” and 26” barrel lengths but both stayed with Node 7 and there was no performance gain. Now juggling through the powder table for a 100% or slightly compressed loading with 100% powder burn, or at least as close as possible, resulted in the following powders being identified:
24” Barrel = 1.434ms BT
BT = Barrel Time
FR = Fill Rate
BR = Burn Rate

Primary Results = FR
Vihtavuori N150 – 71.76grs @ 98.8% FR = 2178fps & 4213ft-lbs @ 44387psi = 99.77% BR
Hodgdon Hybrid 100V – 75.49grs @ 101.4% FR = 2201fps & 4301ft-lbs @ 42356psi = 98.84% BR
Alliant RL-17 – 75.6grs @ 93.6% FR = 2246fps & 4480ft-lbs @ 41370psi = 98.8% BR
Accurate 4350 – 76.83grs @ 99.8% FR = 2247fps & 4483ft-lbs @ 43432psi = 97.7% BR
Vihtavuori N550 – 75.48grs @ 96.0%FR = 2231fps & 4420ft-lbs @ 43078psi = 97.3% BR
Norma 204 – 77.63grs @ 97.7%FR = 2183fps & 4234ft-lbs @ 42561psi = 91.3% BR
ADI AR2209 – 78.02grs @ 101.9% FR = 2185fps & 4240ft-lbs @ 42213psi = 90.94% BR
Primary Results = BR
Accurate 4064 – 70.35grs @ 93.4% FR = 2234fps & 4434ft-lbs @ 46760psi = 100% BR
Norma 202 – 65.8grs @ 86.9% FR = 2180fps & 4220ft-lbs @ 44973psi = 100% BR
Vihtavuori N135 – 66.57grs @ 95.4%FR = 2169fps & 4180ft-lbs @ 45245psi = 100.0% BR
ADI AR2219 – 61.4grs @ 77.3%FR = 2159fps & 4140ft-lbs @ 44367psi = 100% BR
Hodgdon H322 – 61.4grs @ 82.2% FR = 2159fps & 4140ft-lbs @ 44367psi = 100% BR

Anyway, I’m not sure how important this BT stuff is to DRs considering the odd manner in which they’re regulated. Perhaps it’ll make regulation easier. Perhaps it means nothing.

Jim coffee
"Life's hard; it's harder if you're stupid"
John Wayne
Posts: 4947 | Location: Central Texas | Registered: 15 September 2007Reply With Quote
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Those Numbers look pretty good. I like the idea of this on a light double the size of a 375 flanged with a second set of barrels. 375 flanged for PG and 404-375 flanged for tougher animals. Thanks tu2

577 BME 3"500 KILL ALL 358 GREMLIN 404-375

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“The Six Mistakes of Man
The illusion that personal gain is made up of crushing others. The tendency to worry about things that cannot be changed or corrected. Insisting that a thing is impossible because we cannot accomplish it.
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Posts: 25223 | Location: Where tech companies are trying to control you and brainwash you. | Registered: 29 April 2005Reply With Quote
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I don't know that the 375 Flanged would work any better on PG than the 320gr CEB MTH MB or the 320gr GSC HV bullets from the 423/375 Flanged. Maybe not... Maybe so...

Hum...just ran the numbers for a 250gr Barnes TTSX in the 375 Flanged and its looking about 2500fps - same as the 320gr .423 CEB and GSC... So likely not...

Jim coffee
"Life's hard; it's harder if you're stupid"
John Wayne
Posts: 4947 | Location: Central Texas | Registered: 15 September 2007Reply With Quote
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Originally posted by boom stick:

Being that we are bastardizing two English carts together 404-375 does not seem that bad.

I like your thinking.

Phil Shoemaker : "I went to a .30-06 on a fine old Mauser action. That worked successfully for a few years until a wounded, vindictive brown bear taught me that precise bullet placement is not always possible in thick alders, at spitting distances and when time is measured in split seconds. Lucky to come out of that lesson alive, I decided to look for a more suitable rifle."
Posts: 1890 | Location: Eastern Central Alaska | Registered: 15 July 2014Reply With Quote
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