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375 Ultra build...??

 
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  #1  
Old 10-12-2011, 08:40 PM
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375 Ultra build...??

considering doing a build with a 375 rum... but throating it long and setting it up to shoot the 350 smk or hybrids... 30/32" barrel...

anyone done or herd of anything like this? I think i could get the 350 smk up to around 2800/2850 fps... some quick number crunching tells that the OAL would be around 4.120... thats at least what I would start around for the throat...
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Old 10-12-2011, 09:28 PM
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Re: 375 Ultra build...??

Quote:
Originally Posted by batsandowls View Post
considering doing a build with a 375 rum... but throating it long and setting it up to shoot the 350 smk or hybrids... 30/32" barrel...

anyone done or herd of anything like this? I think i could get the 350 smk up to around 2800/2850 fps... some quick number crunching tells that the OAL would be around 4.120... thats at least what I would start around for the throat...
If it will be a single shot any action will work . If you want to use the magazine I would recomend
using a Weatherby MK5 action the mag length is around 3.820 and would come close to the COL
you want. Or a custom action.

J E CUSTOM
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Old 10-12-2011, 09:39 PM
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Re: 375 Ultra build...??

just dropping them in (single shot is fine)

but you think the velocity will max at with barrel 32" and that seating... or call it over 4.0
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Old 10-15-2011, 10:01 PM
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Re: 375 Ultra build...??

Anyone have any info on this?
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Old 10-15-2011, 10:55 PM
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Re: 375 Ultra build...??

I built a 375 ultra for capt. M. gagllardi,Raton PD.swat team leader, used a sako action. 25" Bo clerke bbl. .700 muzzle he pushed 270.gr grand slams right at 3000fps with 92 gr. imr 4350 killed a 400 class b&c bull at 468yds. he said the bull just crossed its front legs and fell over. the throat as i recall allowed a .050 jump. and would shoot .750/3rounds @100yds. his loads, i test fired it with 89 gr. of H-1000. yes i later put a muzzle brake on it. (my design) hope this helps make up your mind. good shooting.

Last edited by panama; 10-15-2011 at 11:03 PM. Reason: left out bbl info.
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Old 10-16-2011, 03:06 AM
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Re: 375 Ultra build...??

I would say 2850fps with the 350gn SMK would be doable in a 30" barrel. Don't think you would need a 32 as the powder would burn quite well in a .375" barrel.
Problem will be getting suitable bullets.
Getting reliable B.C. numbers may be even harder as some of the custom bullet makers tend to stretch the truth with this sort of thing.
Monilithics may be too long and you would have to have the right twist.

I have a 32" long, 1 : 10 twist .375" barrel on order for just such a build. Not sure if it will be a .375 RUM or a Chey-Tac yet but it will be interesting.

I plan to try the Rocky Mountain bullet first and also some home made reformed 400grain .410" Woodleigh bullets.
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Old 10-22-2011, 09:05 PM
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Re: 375 Ultra build...??

I would agree.. you might not have to go 32" but its there if needed..

at this point I am thinking of doing it. I am leaning towards lawton 1-11 32"... I personally want to try the Rocky Mountain 370gr. As you stated though.. we will see what the real world BC is.. they claim .926... but I have some friends that say the BC on that particular bullet is correct...

Also taking the 375 rum case and giving it a 50 degree shoulder...

I am thinking with the 370gr.. hopefully reaching 2850/2900fps.

HOPEFULLY...
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