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#5632827 - 09/19/11 08:28 AM 7mm Rem Mag; Retumbo vs. Rl22
Slim_Sr Offline
Member

Registered: 08/02/09
Posts: 157
Loc: NC
Shot some 150 NBT and 66 grains of RL 22 this weekend.
The accuracy was good but the velocity wasn't what I expected.
My average velocity was 2954fps.
Maybe I'm asking too much for a 24" barrel, Rem 700 but that seems a little slow.

Does anyone get better velocity out of Retumbo and 150 NBT?

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CI16728
#5632874 - 09/19/11 08:51 AM Re: 7mm Rem Mag; Retumbo vs. Rl22 [Re: Slim_Sr]
Roundup Offline
Campfire Ranger

Registered: 09/02/02
Posts: 1921
Loc: Eastern Oregon
I loaded 7MM Rem. Mag with Hornady 154 SP's, Remington brass, CCI 250 Mag primers and 75 grains of Ramshot Magnum and chronoed 3160 fps for 10 shots. This was out of a 700 BDL with a 24" barrel.
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#5632882 - 09/19/11 08:54 AM Re: 7mm Rem Mag; Retumbo vs. Rl22 [Re: Slim_Sr]
jryoung Offline
Campfire Ranger

Registered: 12/17/09
Posts: 1863
Loc: Unable to determine due to vel...
66.5 of RL22 pushed Barnes 145LRX at 3,100 for me with great accuracy. Granted different bullets, guns etc. but I'd say that isn't too far off what to expect.

Through my load testing, all bullets were slower than what I expected out of my 7RM. That's why I have a Mashburn reamer screaming at me to have it run up a barrel.
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Four of a kind: 7x57, 284 winchester,7 Rem Mag, 7 Mashburn.


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#5633128 - 09/19/11 10:30 AM Re: 7mm Rem Mag; Retumbo vs. Rl22 [Re: jryoung]
nyrifleman Offline
Campfire Guide

Registered: 04/27/05
Posts: 2776
Loc: Adirondack Mts., NY
IMR 7828 perks in my 7Mag with a 24" bbl.

150 Ballistic Tips average around 3180 fps IIRC....

I've only shot Retumbo under 160 grainers...
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Killing game at 600+ yards...an affirmation of your shooting skills, or an indictment of your hunting prowess?
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#5634278 - 09/19/11 04:31 PM Re: 7mm Rem Mag; Retumbo vs. Rl22 [Re: nyrifleman]
JMR40 Offline
Campfire Guide

Registered: 02/21/07
Posts: 3198
Loc: Georgia
I tried 65 gr of RL 22 with 160's a while back and got 2900fps from a 24" barrel. One source I looked at says I should be getting 3075. www.alliantpowder.com says 2976. Either way I'm shooting a little slower than expected too.

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#5634323 - 09/19/11 04:42 PM Re: 7mm Rem Mag; Retumbo vs. Rl22 [Re: JMR40]
gunner500 Offline
Campfire Kahuna

Registered: 09/07/09
Posts: 21856
Loc: Oklahoma
Retumbo will make all overbores shine w/ 28 to 30 inches of barrel grin

Gunner
_________________________
"I Walk Alone"

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#5634383 - 09/19/11 05:00 PM Re: 7mm Rem Mag; Retumbo vs. Rl22 [Re: JMR40]
Enrique Offline
Campfire Guide

Registered: 03/27/01
Posts: 3919
Loc: Mammoth AZ USA
We started development with Retumbo and 154 interbonds.
at 70.0 grains the chrono said 3005 if I recall Correctly. 70.4 read around 3050 and 70.8 read over 3100 but had a sticky bolt so we settled on 70.4 being my max.
If the chrono was correct, I hit 3050FPS with 70.4 grains of Retumbo, 154 interbonds with Win Nickel and Win Mag Primers. That was out of my Rem 700 with a 26" factory tube.
I was expecting a faster round myself, that being said, maybe the chrono was off or maybe Retumbo isn't the best with 150's/154's. We will find out soon when we go to the range and see what happens. I honestly expect better vel out of my 7 mag. That being said, I see us trying Win Supreme 780 and Ramshot Magnum in the future.

Kique
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Enrique O. Ramirez
CLAN OF THE BORDER RATS - Member

"..faith is being sure of what you hope for and certain of what you do not see.." Hebrews 11:1

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#5634643 - 09/19/11 06:08 PM Re: 7mm Rem Mag; Retumbo vs. Rl22 [Re: Slim_Sr]
1OntarioJim Offline
Campfire Guide

Registered: 08/09/05
Posts: 2749
Loc: N. Shore, L. Ontario
Welcome to the weird world of the 7mm Rem Magnum. I have one and would never get another due to the unpredictabilty of their loadings. With 175 gr. bullets in my gun I have to use about 4.5 grains over the max. book load in order to get an acceptable level of velocity (but not the maximum the cartridge is supposed to be capable of.)

Jim

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#5634872 - 09/19/11 07:02 PM Re: 7mm Rem Mag; Retumbo vs. Rl22 [Re: Slim_Sr]
rockchuck828 Offline
Campfire Regular

Registered: 04/09/09
Posts: 1200
With your combo if RL22 does not work well, the other 3 powder's are IMR7828, VVN165 or H1000.
Retumbo would not even be on my list !!!!!

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#5635170 - 09/19/11 08:15 PM Re: 7mm Rem Mag; Retumbo vs. Rl22 [Re: rockchuck828]
gorskij Offline
Campfire Regular

Registered: 05/08/11
Posts: 973
Loc: Central Wis.
Originally Posted By: rockchuck828
With your combo if RL22 does not work well, the other 3 powder's are IMR7828, VVN165 or H1000.
Retumbo would not even be on my list !!!!!

Id definitely try Retumbo, it gives the most velocity and I have some on hand.

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