Do I want a 375 RUM?

westexhunt · 2025-01-25T12:37:26-0600

I have never built anything bigger than 300 RUM, and have a few questions. I want be able to shoot the 390 Atip and 410 Berger, as well as the lighter bullets down to 250gr or so. I realize that in a Rem 700 ultra mag action I would have to pull the bolt to eject a loaded round with the 390-410gr bullets.
Is 375 RUM enough capacity?
Can it be throated for the 390 or 410gr bullets and still get accuracy with the shorter lighter bullets?
Know where to find an 11 twist 375 blank?
My intention is to shoot steel at a mile, then maybe hunt something big one day.

huckfin · 2025-01-25T12:41:17-0600

memtb · 2025-01-25T12:43:28-0600

I won't attempt to answer your technical questions, but can answer the title of your thread in 2 words……"Hell Yes"!

memtb

Earnhardt · 2025-01-25T12:43:50-0600

Go for it.
Do a "Search" for "375 RUM Build", on the forum

I can't figure out how to paste a link in your thread here.

Earnhardt · 2025-01-25T12:47:39-0600

375 RUM Build

Does anyone here shoot one? I was originally thinking of doing a CheyTac build but I already have a 700 donor long action in the safe I could use I believe. Or am I wrong and the bolt face won’t work? It’s a 7mm mag action originally. But if the action will work, are any of you here using one...

www.longrangehunting.com

adam32+P · 2025-01-25T12:49:53-0600

I think if you want to shoot the 400gr class bullets then you should step up to a Cheytac size cartridge, especially if you have a mile in mind.

Keep with the regular 300gr ish bullets and the RUM will be great.

436 · 2025-01-25T13:02:56-0600

westexhunt said:
I have never built anything bigger than 300 RUM, and have a few questions. I want be able to shoot the 390 Atip and 410 Berger, as well as the lighter bullets down to 250gr or so. I realize that in a Rem 700 ultra mag action I would have to pull the bolt to eject a loaded round with the 390-410gr bullets.
Is 375 RUM enough capacity?
Can it be throated for the 390 or 410gr bullets and still get accuracy with the shorter lighter bullets?
Know where to find an 11 twist 375 blank?
My intention is to shoot steel at a mile, then maybe hunt something big one day.

Pac Nor... you might look at their 1-10 Poly.

375 (0.375")
3 groove
1-12"
1-15.00"

5 groove
1-7.5"
1-8"
1-10.00"
1-12"
1-14"
1-18"

polygonal
1-10"

Cheers

str8meat · 2025-01-25T14:25:03-0600

I want one but afraid I will have to build a left handed model before I ever see 1 for sale

westexhunt · 2025-01-25T15:15:51-0600

adam32+P said:
I think if you want to shoot the 400gr class bullets then you should step up to a Cheytac size cartridge, especially if you have a mile in mind.

Keep with the regular 300gr ish bullets and the RUM will be great.

That sounds like good advice. Thank you.

adam32+P · 2025-01-25T15:31:35-0600

westexhunt said:
That sounds like good advice. Thank you.

I don't think people realize how big the bullets are...here's a 411gr hammer next to a .243 Win...

str8meat · 2025-01-25T21:08:02-0600

Although I do have a 30-378 that I could build a 378 weatherby

6mm06guy · 2025-01-26T10:47:02-0600

Who builds an action big enough to handle the cartridge with those 411s seated out? I may want one for my self.

Poor_choices · 2025-01-26T12:04:59-0600

adam32+P said:
I think if you want to shoot the 400gr class bullets then you should step up to a Cheytac size cartridge, especially if you have a mile in mind.

Keep with the regular 300gr ish bullets and the RUM will be great.

This is really good advice. The RUM case can do pretty well with the 350 SMK as long as you're willing to single load them. The lighter monos might be with considering too.

skipglo · 2025-01-26T12:09:05-0600

str8meat said:
Although I do have a 30-378 that I could build a 378 weatherby

Now you're thinking !!!!

Do I want a 375 RUM?

westexhunt

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huckfin

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memtb

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Earnhardt

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Earnhardt

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375 RUM Build

adam32+P

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436

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str8meat

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westexhunt

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adam32+P

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str8meat

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6mm06guy

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Poor_choices

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skipglo

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