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7mm reloading
#5883596
08/18/15 03:07 AM
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We loaded some 7mm rem mag for a new gun. Really nice sako and the leupold with the custom turret.. we got a load that would group,finally. we started with h1000 and 168g accubondlr, we never got a load to group good enough. We went to retumbo and 160 accubond.. got a load to group respectable, but its only shooting at 2790 fps, not quite what i would like but im not all that familiar with bigger bullets from the 7mm, ive been using 140 g in mine.. we were getting mid 2900's with the 168 and h1000.. is that enough velocity for that bullet with big game and long range in mind? Mule deer , elk and oryx possible targets...
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Re: 7mm reloading
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#5883612
08/18/15 03:16 AM
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Joined: Mar 2012
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Cleric
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How long of a barrel? I think you may need a bit faster powder to get more velocity...but I will defer to the reloading experts
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Re: 7mm reloading
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#5883770
08/18/15 10:07 AM
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Joined: Oct 2006
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dawaba
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We loaded some 7mm rem mag for a new gun. Really nice sako and the leupold with the custom turret.. we got a load that would group,finally. we started with h1000 and 168g accubondlr, we never got a load to group good enough. We went to retumbo and 160 accubond.. got a load to group respectable, but its only shooting at 2790 fps, not quite what i would like but im not all that familiar with bigger bullets from the 7mm, ive been using 140 g in mine.. we were getting mid 2900's with the 168 and h1000.. is that enough velocity for that bullet with big game and long range in mind? Mule deer , elk and oryx possible targets... I've shot mule deer, elk, and oryx with the 7mmRM, mostly with 160 NPTs, but also with 160 ABs, 175 NPTs, 140 NPTs and 140 TTSXs. You can throw in a moose, some caribou, stone sheep, mnt goat, and others....all with reloads in 4 different rifles. IMO, the top all-around performer for your criteria will be IMR4831, which almost always gives top velocities with fine accuracy. Expect 3050 fps with the 160s and 3250 with the 140s. Re-22 is almost as good. H-1000, in my hands, burns too slowly, especially with the 140s; save this powder for 175 gr and heavier bullets.
"For every complex problem there is an answer that is clear, simple.....and wrong." H. L. Mencken
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Re: 7mm reloading
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#5884231
08/18/15 04:22 PM
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ChadTRG42
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2790 fps with a 160 grain out of a 7 Mag with Retumbo is basically a starting load on the slow side. It's running about 280 Rem speeds. You can easily get 200 fps more if you keep moving up your powder charge. It's plenty of velocity for the bullet to work properly, but why shoot a 7 Mag if you run it slow. When you say "long range", that tells me beyond 600 yards. So, all the speed you can get is better, but it will still possible.
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Re: 7mm reloading
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#5884362
08/18/15 05:46 PM
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My brother took it out and shot it at 600 yds and also his 7mm ultra with the same bullet, shooting steel plate.. ultra blew thru, 7mm rem exploded on impact, that kind of bothers me ..
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Re: 7mm reloading
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#5884373
08/18/15 05:55 PM
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Joined: Aug 2013
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cabosandinh
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My brother took it out and shot it at 600 yds and also his 7mm ultra with the same bullet, shooting steel plate.. ultra blew thru, 7mm rem exploded on impact, that kind of bothers me .. that tells me you don't have AR500 Steel Plate
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Re: 7mm reloading
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#5884379
08/18/15 05:59 PM
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ChadTRG42
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My brother took it out and shot it at 600 yds and also his 7mm ultra with the same bullet, shooting steel plate.. ultra blew thru, 7mm rem exploded on impact, that kind of bothers me .. They all do that!!! If you are using thin mild steel (non AR500), almost all bullets will blow through mild steel. And all bullets will fragment (not explode) on impact on steel.
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Re: 7mm reloading
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#5884467
08/18/15 06:47 PM
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Joined: Dec 2008
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J.G.
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What is your powder charge of Retumbo that is pushing a 160 gr @ 2790 MV? How long is the barrel?
My 7 Rem Mag has a 26" Rock Creek stainless 1:8" twist Retumbo 71.2 gr compressed 180 gr. Berger, 3020 fps MV
I have loaded for two other 7 Rem Mags and they all started shooting the best on a compressed load of Retumbo. Once I see extractor swipe I proceed with caution.
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Re: 7mm reloading
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#5884596
08/18/15 08:10 PM
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Not max.. only had time for 2 loads after that lost 1st day. 68 and 69 is all i did, but with my brother shooting the 68 grouped better.. maybe i need to get the gun and try upping the charge..
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Re: 7mm reloading
[Re: ChadTRG42]
#5884599
08/18/15 08:12 PM
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He shot the same plate with both guns and same bullet, the ultra went thru, the.7mm rem exploded on impact.. My brother took it out and shot it at 600 yds and also his 7mm ultra with the same bullet, shooting steel plate.. ultra blew thru, 7mm rem exploded on impact, that kind of bothers me .. They all do that!!! If you are using thin mild steel (non AR500), almost all bullets will blow through mild steel. And all bullets will fragment (not explode) on impact on steel.
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Re: 7mm reloading
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#5884650
08/18/15 08:44 PM
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ChadTRG42
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The 7 RUM is pushing that 160 about 3200 fps compared to your slower 2790 fps, which is a difference of about 400 fps. That's a big difference. Also, bullets never explode, they fragment.
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Re: 7mm reloading
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#5884805
08/18/15 10:24 PM
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Ultra mag is at 3130fps, still a big difference.
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Re: 7mm reloading
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#5888313
08/21/15 01:23 AM
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Chad was saying that 2790 was basically starting loads for the 7mag/160g/retumbo combination.. my load data says 69.5 max we went with 68 and 69, even the 69 wasnt flirting with the 3000fps mark, dont remember the exact number , but not alot over the 68g charge and the 2790fps. How is that 180 building speeds over 3k? Is it all barrel length? Kind of confusing..
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Re: 7mm reloading
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#5888358
08/21/15 01:53 AM
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Found the 69g retumbo speed.. 2923,2905,2915.. when i went to my notes i found the 68g velocity we clocked here in odessa.. 68g retumbo speeds of 2867,2876,2846.. when my brother got the gun up to farmington nm , he shot it again and it was at 2790fps.. he went up in elevation and down 25 degrees in air temp.
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Re: 7mm reloading
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#5890905
08/22/15 10:51 PM
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Driving myself crazy, short trip, looking to find the right bullet/powder/charge combo on this stupid 7mm. Thought about trying the reloader22 powder but read where its very temperature sensitive. This gun will see temperature extemes.. thought about accurate magpro with the 160ab or possibly retumbo and the 168ablr.. to dang many options.. the 24"vs 26" barrel thing seems to affect the veocity i want to see as well..
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Re: 7mm reloading
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#5891254
08/23/15 03:15 AM
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Joined: Dec 2008
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J.G.
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Quit making it more complicated.
Pick one temperature stable powder and go with it, i.e. Retumbo.
The longer the barrel the more velocity it will make. Many of us subscribe to the theory that every 7 Rem Mag and every 300 Win Mag should have a 26" barrel. Some barrels are slower than others. Go with the load that shoot the most consistent, not what shoots the fastest. Obviously we want all the speed we can get, but velocity does no one any good if it doesn't shoot consistent.
Is your chronograph light dependent? It is unless it is a Magneto Speed or a Lab Radar. That can give a velocity descepency day to day. That is the reason to get a load that shoots, reproduce it, and see what trajectory changes you get in various ambient temps and density altitudes.
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Re: 7mm reloading
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#5891460
08/23/15 01:06 PM
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Guess we need to stay with the retumbo and live with the velocity. Lesson learned on barrel length. y'all know alot more than i ever will ..thanks
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Re: 7mm reloading
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#5892498
08/24/15 01:34 AM
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Joined: Apr 2010
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dee
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Another factor to velocity is the bearing surface of the bullet. The Berger like fireman is using like has a small bearing surface thus less resistance.
"A vote is like a rifle; it's usefulness depends on the character of the user" Theodore Roosevelt
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Re: 7mm reloading
[Re: Team By-God]
#5894491
08/25/15 03:15 AM
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Joined: Aug 2015
Posts: 104
Patweldon
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I load 63.5 grains of rl22 with a 140grain accusing and can stack bullet inside one another.. Shooting over 3000 fps.. I have a Winchester with a 26" barrel and muzzle break as well.
Always remember you can only shoot as good as your scope will allow. I have a ikon monarch3 6x24x50
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Re: 7mm reloading
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#5897460
08/26/15 07:58 PM
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Joined: Jun 2015
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Jgraider
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I always reach for RL22 first when loading for my 7RM's. I also start the bullet seated out near the lands, .010 off, find pressure, then adjust seating depths accordingly. I've never had problem getting 160AB's to shoot extremely well especially when near max pressure, or 3030fps in my 26" HCR. My 24" Tikka does like 71.5g/160AB's of Retumbo, at 3060fps though.
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Re: 7mm reloading
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#5897731
08/26/15 10:55 PM
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My book shows 69.5c max charge for 160g..
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Re: 7mm reloading
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#5898111
08/27/15 01:57 AM
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Joined: Jun 2015
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Jgraider
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Manuals are a great resource, but are usually on the conservative side, especially when dealing with max loads. That's why I always like to find pressure in my individual rifles, as they usually all vary. I see you're from Odessa. Do you shoot at the Midland range? I shoot there, and would help you in any way I can if you so desire. What rifle are you loading for? Check out this resource: It has alot of great information. http://www.reloadersnest.com/frontpage.asp?CaliberID=48
Last edited by Jgraider; 08/27/15 01:59 AM.
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Re: 7mm reloading
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#5898157
08/27/15 02:24 AM
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I have a lease west of odessa that we shoot at.. the rifle we were having trouble with was my brothers from new mexico.. mine, which was my dad's, is the only 7mm i actually own.. i load 140's with retumbo in that one with good results. My brothers ultra mag does well with retumbo and 160ab's.. the gun was a really nice sako and leupold combo, i only had access to it for a wknd then it went home with my brother.. the 68g seemed to shoot better than the 69g with my brother shooting and the limited time we had to shoot, only issue was velocity. Although its not like it was stacking bullets on top of each other..
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