7mm Remington Ultra Mag

[oldmossy]

Originally Posted by Airgunner7

Good thread...not too much info on 7 Rums.

Been playing with mine for a year with 180 Berger vdls and 160 Accubonds.

How high can I go with retumbo and 180's?
Berger sent me quick max load of 86g @3050....I see one other fellow here did 92!!!

I have gone to 86.5 @ 3010 and and settled on 85.5 @2960....I feel like I am not using the advantage of the Rum.

Anyone else have problems with primers not hot enough to light powder? I use cci 250's and was thinking about 215m's?

I am shooting the 180 vlds in my factory sendero. The very first 5 shot group fired from this rifle was .56 at 100yds with 90 grains of retumbo. The second 5 shots was with 91 grains and the first 3 shots were in the same hole. Error on my part I believe opened the group to an inch with last two shots. That was during the summer in 90 degree weather. Since I am a hunter, I waited until this winter to make sure of the loads before loading a bunch of ammo that didn't perform like it did in hot weather. Since cold weather arrived, I have not been able to get any better than 2" at 200.And not much better than that at 100. I have tried more loads than I wanted- all being with 180 vlds and retumbo powder. Powder charges from 90-93 grains with no signs of pressure and chronoed speeds in the low 3300s with the 93 charge. The powder charge nor bullet seating has not affected the size of my groups. Almost all groups are of near equal size. I am also using CCI large rifle magnum primers. I'm also worried about the speeds being to fast now, and even though I just ordered some 168s, may not even worry with them. After reading Allens blogs, I may just stick with the 93 grain charge and get off the bench and see how it performs out ot 1000. I'm not wanting to replace my barrel. I've also sent an email to berger asking them about the speed of my 180 to see if I need to slow it down. Another guy was telling me about the second shock wave??? Its on my "how fast is too fast-bergers" blog.Hope I did'n ramble on too much.

[Airgunner7]

Holy cow 3300fps with a 180? You need a lotto ticket.

[oldmossy]

3300! I've asked if my chrono is wacky? However, even at 90 grains it is shooting 3100 fps ( by my chrono). And this has been over the course of many different days-temps-clouds-sunny. Why's my rifle getting such high speeds??? My chrono is brand new.

[Airgunner7]

Well, I don't think your chrono is off, 86.5 Retumbo Grains is max load at 3049fps. This is from Berger.
I see no reason 90 @ 3100 would be off. The 3300 has me nervous as that's gotta be a pressure spike. 3+g of powder should =100fps not 200
Back er off some then go buy a lotto ticket and hug someone you love.

BTW the 1000y record was like 2800'ish with those 180 Bergers

[wyoming4x4]

hello guys just checkin in. Just purhased a 7mm rum sendoro stainless. haven't shot yet but soon. Getting educated on this rifle. Get me a new rifle and job sends me out of town not fair! Purpose is long range and hogs. 180vld and retumbo has been recommended and seems to be a good plan from reading on here. Some of my possible shots are 1500yrd possible and never owned a rifle with this capability. Looking at upgrade on barrel down the road. Is shillen a good way to go? I'm a newby to this gun and long range. Go easy and thanks for taking the time on combinations. lost in wyoming and lovin it!

[meatyrem]

Hey, welcome.

You've come to the right place. There many on here that have many years experience and lots of range time. Many on here have lot of knowledge about what your looking for and will be of great help.
Also if you haven't already, do a search on the 7rum and here will be some, not a lot but some threads on here that can definitely send you in the right direction. Also for additional loads, you can try reloadeds nest. I frequent that site much and is helpful too.
I can tell you that your probably going to be limited on seatin depth as the 7rum has a long throat. So you may just have to style for magazine length for your OAL. I did and it doesn't do too bad. For an example, I can have a OAL of 4.00" and still not touch my lands with a 160 accubond so I settled for 3.65". Some will say the 7rum is finicky and it may be and others will tell you theirs is a dream. It's all about finding the right load. Others may sound off and lend you their knowledge and hopefully send you in the right direction. Good luck and good shooting.

[WildRose]

Originally Posted by wyoming4x4

hello guys just checkin in. Just purhased a 7mm rum sendoro stainless. haven't shot yet but soon. Getting educated on this rifle. Get me a new rifle and job sends me out of town not fair! Purpose is long range and hogs. 180vld and retumbo has been recommended and seems to be a good plan from reading on here. Some of my possible shots are 1500yrd possible and never owned a rifle with this capability. Looking at upgrade on barrel down the road. Is shillen a good way to go? I'm a newby to this gun and long range. Go easy and thanks for taking the time on combinations. lost in wyoming and lovin it!

Welcome. Im' not sure of the twist rate on the factory Sendero but as a rule I wouldn't shoot anything unde 160gr and would look to the 180-190gr offerings if you can find them and it will stabilize them.

Check your paperwork that came with it and see what the twist rate is and then compare it to the twist rate recommendations of the bullet mfg's you plan to use.

When that day in the future comes to rebarrel it Shilen is a good choice but so are Benchmark, Bartlein, Krieger, Hart, and many others. Today we are not limited to just a handful of good barrel makers like we were 30-40 years ago.

Find a bullet you like that it shoots well, then tweak your load till you hit the sweet spot.

Be patient when shooting and just don't get it hot and keep shooting and it'll last you quite a long time. As a rule if you'll keep to 3 shot groups and not average more than 1 round per two-3 minutes at the bench you'll get a lot of life out of any barrel even in such an overbored caliber like the 7mm STW or 7mm RUM.

I tend to shoot three shots in fairly quick succession and then put it down and pick up another rifle and start with it giving each rifle a minimum of 5-10 minutes to cool down between groups even on cold days.