7MM RUM??

[dustineriksen37]

Unfortunately, when I had mine the slowest powder we had access to was 7828 and I took that last barrel off well before powders like Retumbo, H50BMG or N570 were available.
I would guess using powders this slow would gain between 50-150fps, but this is a WAS at this point. Mine had a 8" twist even back then, but the factory barrel was 9 1/4" twist which lasted 600 rounds.
I got high velocities with 175g bullets, 100fps faster, with RL25 when it came out. No other powder then could match it in several magnums.

Someone must be shooting one with 195's and slow powders here.

Cheers.

I'm shooting a 7 RUM with a 29" barrel, 195 bergers with 90grns of 50BMG. Getting 3010 fps

 

[QuietTexan]

While I have and love a good RUM (7, 300, 338, 375), the Norma Mag case lets you run a shorter COL. Not a problem if you already have a Wyatt's box like I do for the 7 RUM, just something to think about if building new. The 7-300NMI is a rocket launcher,

 

[260shooter]

Thanks everyone for the replies.

 

[260shooter]

Following along for the Rum !
I was told Retumbo and the 180 gr berger for the Win !

Rum Man

I hope this is a good combo. I have more than enough to wear out 2 barrels.

 

[260shooter]

Long barrel and us869 would probably get any of the 190+ family flying faster than 3k, slightly faster for 180s

Total case capacity is 93% of the Lapua mag, so performance will be congruent

I will pick up a pound of US869 and 50BMG.

 

[260shooter]

RL33 no longer available. N570 - tho 500 round barrel life expectation

I have 1 LB of RL33. That would make about 16 rounds. I have 8 LBS of 570 but plan to use that on a 7 REM Mag.

 

[260shooter]

Morning, mine likes the Rl 25. I'm also using Nosler Accubonds 160gr. Do not use the Nosler ABLR. They won't give you a consistent group unfortunately. It also likes super clean barrels. About every 8-9 rounds,

That's high maintenance!

Any other advice on cleaning schedules?

 

[Jim’s Hunt]

That's high maintenance!

Any other advice on cleaning schedules?

What chemicals are you using to clean with. Just a thought it might to much copper and carbon build up?

 

[260shooter]

Anyways I asked a similar question a few years back and it generated some good discussion. Here's the link

Is the 7mm RUM dead?

Exactly what the title says. With the 28 Nosler, 7mm stw, 7mm weatherby and various Sherman cartridges all coming soooooo close to what the RUM can do, and with notably better barrel life…is the 7 RUM dead? Anyone here shooting one AND planning to stay with that cartridge in the future...

www.longrangehunting.com

Thank you.

 

[260shooter]

I have everything for a build except an action and a trigger. I will be using a brake and a Wyatt's box. I have a later version HS Precision Remington Sendero stock. It is a light stock. I imagine total weight will be 10-11 LBS.

Thanks to who responded with realistic numbers. The loading manuals were anemic. Barley above 7 REM Mag numbers.

 

[6.5x300 WBY]

While I have and love a good RUM (7, 300, 338, 375), the Norma Mag case lets you run a shorter COL. Not a problem if you already have a Wyatt's box like I do for the 7 RUM, just something to think about if building new. The 7-300NMI is a rocket launcher,

What's the performance you are getting with your 7-300NMI?
THE 28 noz if Ryan pierce builds it gets 3150 with 195's. Can you go north of 3250?

 

[Rebell]

Morning, mine likes the Rl 25. I'm also using Nosler Accubonds 160gr. Do not use the Nosler ABLR. They won't give you a consistent group unfortunately. It also likes super clean barrels. About every 8-9 rounds,

I concur with the RL-25 for the 7 and 300 RUM. I have enough to keep my pet loads fed for life but and no longer building loads with the Reloader powders. It's really to bad.

 

[jessej]

LRT works pretty good with the 7RUM and 160 nosler BTs

 

[std7mag]

I have 1 LB of RL33. That would make about 16 rounds. I have 8 LBS of 570 but plan to use that on a 7 REM Mag.

I have rounds made up for my 7mm Rem Mag and 7mm Weatherby Magnum with Ramshot LRT.

LRT might also be usable for the RUM.