300 Win Mag - 270WSM - 7mm Rem Mag

[SJB358]

Well, these are the other three children I have been working on. First up was the 270WSM, I loaded 4 each of 71-75gr of Magpro with the 130gr Hornady Interbond. First load with 71gr put a very nice 7/8 triangle in the tgt. 72 did about the same and after that, they just got worse. I am pretty sure I have narrowed them down. I am going to load 8 more of the 71 and 8 of the 72gr and see what comes up. That rifle has always been fantastic with about anything through it.

300 Mag next. Nightmare. Did the same thing as the 270WSM. Loaded from 71-74 grains (IMR 4831) over the 165gr HDY Interbond. 73 looked really good and 74 was the same. Well, loaded 20 of the 74's and shot them at 3 shot groups. It was very inconsistent. 2 shots would be really close, and the third would be out there(wasn't always the first shot, and it was intermittent). I did let the barrel cool one minute between shots and about 15 minutes between groups). I have been measuring all charges, and making sure length and everything else is consistent. I am going to drop back to the 73gr charge and check it out. That grouped very well, and seemed to be all the 165 needs to do what it is supposed to.

7mm Rem Mag. I have 4lbs of H870, and that has always been an excellent powder for 160's in the past. Well, I have some old load data from Speer and loaded 76-78 with 175gr HDY Interlocks. 4 shot groups. They were all over 2". None of them got better or worse really. Just a ton of recoil and not a whole lot of accuracy. I have some Speer 160gr Mag Tips, that I have loaded up with the old data of 78-80 and will give them a try next time. That rifle has always been an excellent shooter. I really don't want to buy more bullets, as i have alot of these on the bench, so we shall see how they work out. I have been working about .025 off the lands for all of them. I would mess with seating depths, but it seems pointless until I get a little closer to what I want.

I did just sit down and clean the heck out of all of them, with CR-10 and made sure patches were coming out clean, so the next range session should show something. Anyhow, just wanted to let you all know what I was up to since I have been home. Makes me wish I had a range in the back yard. Takes too much patience to wait to go to the range. If you guys see anything that may help, let me know. Scotty

 

[DrMike]

One of the finest loads I ever developed in my 7mm RM used 74 g. H870 and NOS 175 PT. Consistent sub-MOA groups and decent velocities. I've had great success with 60.2 g. WXR (if you should find any) and 175 g. TBBC.

MagPro should be an ideal powder for your 270 WSM. It is my "go to" powder for the 7 mm WSM with 160 g. AccuBond. I have only one load that I have used in my 270 WSM, consisting of MagPro. It is a charge of 72.5 g. with BAR 130 TSX. Great velocity and excellent groups. Though velocity is less, the groups are even better with 63 g. RL 19. The load I am focusing on for this fall is 67.5 g. RL19 and SWF 130 SCI. Great velocity and excellent groups.

 

[FOTIS]

76 H4831 or RL22 for the 180 grains for the 300 Win mag. That has worked in every decent 300 Wnnie I have loaded for.

rl22 HAS ALSO WORKED for the 270 wsm and the 7mm rem mag.

 

[blacktailhunter]

I would ditch the interbonds in the 300 and change powders in the 7. You have the correct powder and charge in the 270WSM it appears. Magpro is my favorite in the 270WSM.

 

[mildot]

my 7 mag shoots the following

63gr IMR4350 150gr Scirroco's
66gr RL22 154gr Interbonds
65gr 4831sc 160gr Accubonds
63gr IMR4350 168gr VLD's

All the above shoot 1/2" - 3/4" groups no problemo!

Just bought a 270wsm but havent had time to test yet! but i have rl22 and rl25 and 150gr sst and nosler bt to try.

 

[SJB358]

I would ditch the interbonds in the 300 and change powders in the 7. You have the correct powder and charge in the 270WSM it appears. Magpro is my favorite in the 270WSM.

Blacktail, why do you say to ditch the Interbonds? I realize we are on a Nosler Forum, but my local dealer stocks HDY, Speer, and Sierra. I use the 95gr PT in my sons' 243 because I bought a bunch of them, but it easier to stay in stock if the locals keep them in their coffers. Plus, it is nice to support local business, just to keep up their reloading supplies.

I will switch to a different powder for the 7mm Mag if the next bunch doesn't shoot well. I would like to find a use for the H870 though. I have a bunch of it, and it used to work well in the past.

I have R22 on the bench, so I may try that next if I can't get IMR4831 to work for me. I am not looking for the top velocity, just near as I can with hunting quality accuracy. I am thinking the 270WSM is done, but the other two are going to need some more time. If the next loads don't work, I will try IMR4831 or the R22 in the 7mm Mag, and will also try the R22 in the 300. There are some good loads listed for MagPro in the manuals also. I like Magpro since it meters so nicely also. Thanks for all the tips. I will keep working at it. Scotty

 

[JDMAG]

The best load I have found for my 7 Mag is the 66 GR RL22 with a 160 AB.

 

[DrMike]

Scotty,

If the Interbonds shoot well, use them. They will work just fine in the 300WM. I have worked up a number of loads with them in a variety of rifles, and no one has complained. The only negative that I have ever observed is that sometimes the Interlock is more accurate than the Interbond, indicating the bonding process may introduce an asymmetry. However, the difference between the two loads, while observable, was minimal and would not lead me to jettison the bullet.

 

[SJB358]

I may try some 154gr HDY Interbonds. I would like to use Accubonds, but trying to find any without ordering them is a little tough in my parts. The local stocks HDY, Speer, and Sierra stuff and will keep whatever I buy in stock and order me what I want. I think the Interbond and the AccuBond are about the same bullets for my use. Seems like R22 is a pretty good powder for the 7mm Mag. I tried some, but didn't have great accuracy. I may try revisting it again and see what comes up. Scotty

 

[SJB358]

Scotty,

If the Interbonds shoot well, use them. They will work just fine in the 300WM. I have worked up a number of loads with them in a variety of rifles, and no one has complained. The only negative that I have ever observed is that sometimes the Interlock is more accurate than the Interbond, indicating the bonding process may introduce an asymmetry. However, the difference between the two loads, while observable, was minimal and would not lead me to jettison the bullet.

Seems like they shoot really well out of my 270WSM, and they do come in boxes of 100 which assists in the load development process. Lets me buy one box to do development and then, I usually have enough left to load for hunting. I am waiting for my guy to get some 180 Interbonds in stock. I would like to stick with 180's for the 300 Mag, but a 165 can be shot pretty fast and if it is accurate I can't see any reason it wouldn't hammer bear/deer/elk with authority. I may go up today and see what he has. Scotty

 

[DrMike]

Interestingly enough, almost all the load development I do for others for the 300WM and the 300WSM ask for 165/168 grain bullets. I prefer 180 grain bullets in my own 300WSM, and I have several good 200 grain loads. I do not take a lot of shots that reach out to 400+ yards, so there is no great advantage with the 15 grain lighter bullets, and the extra weight just feels good for that time I might be faced with the need to dissuade a mountain grizzly from chowing down on my leg. I can testify that the 180s (Failsafe, Interlock and AccuBond) work very well on bear, elk, moose and mule deer.

 

[JDMAG]

Beretz,
You may have to order them, but you cant beat this price. they are seconds, but just as good as factory firsts.

http://www.bivwak.com/auction_details.p ... _id=131621

 

[JD338]

beretzs

Go with RL 22 in the 7mm Rem Mag and 200 Win Mag and don't look back.

In the 300 Win Mag
180 gr PT, BT or AB
75.0 grs RL 22
W-W case
Federal GM215M primer

This load has shot well under MOA in 3 different rifles.

JD338

 

[SJB358]

JD338, I am going to try your R22 load for the 300 Mag once I try the next batch of IMR4831 loads I have made up. If they don't work, I will try R22 with your load. I will also give it a shot in my 7mm Mag. It would be nice if they shot the same powder. Trying to keep powders somewhat useful for a couple different rifles. I know it probably won't happen, but it is worth a shot.

JD Mag, you are right about the Nosler 2nd's. I have been wanting to try them, and they are the right price, I just haven't ordered or do not know how to go about it. I will do a little research on it though. Scotty

 

[JD338]

JD338, I am going to try your R22 load for the 300 Mag once I try the next batch of IMR4831 loads I have made up. If they don't work, I will try R22 with your load. I will also give it a shot in my 7mm Mag. It would be nice if they shot the same powder. Trying to keep powders somewhat useful for a couple different rifles. Scotty

beretzs

RL 22 works very well in both the 7mm Rem Mag and 300 Win Mag.
Just remember to start low and work up.

JD338

 

[SJB358]

Rgr, got it. I always try drop a few grains when I start anyhow. Hopefully they pan out for me. Sounds positive if you have had such good luck with it. Scotty

 

[SJB358]

I am going to load a few R22 loads today and some of the IMR4831 loads that were the most accurate. I will probably try two of the middle loads of R22 just to see how it looks. If it is better than my IMR4831 groups, I may try and switch up. If I can get done early enough, I will get to the range today and try them out. Scotty

 

[nomosendero]

beretzs, for some reason my 300WM does not like the Hor. SST, but loves the 180 AccuBond with RL22 or RL25. My brother just bought a 300PSS & it is the same story for that rifle.

 

[SJB358]

I am going to try this next batch of loads with IMR4831 and R22. If none of them pan out, I will try ABonds or PT's next. I will also bump up to 180's. I went with 165's Interbonds cause the local gun shop has quite a few of them. If I could get seconds from Nosler that would be more to my liking. Scotty

 

[remingtonman_25_06]

In my 7mm all I have used is RL-22 with about 6-7 different bullets and it has shot every bullet into 3/4" or less at 100 yards.

When I had my 300 Win, I also used only RL-22 75g w/180g NBT's. It was also a 3/4" load at 3100fps.

RL-22 is one of the better powders for the 7 and 300. It usually produces good groups and great velocity.

I have tried the 180g SST's in a couple different 300's and they all shot poorly. Nothing better then 1" that I can remember.

I have tried the 162g sst in my 7 Rem mag and have gotten it down to 3/4" with limited testing. I would like to work with it a little more as I know my rifle can shoot them better.

Just remember that rifles dont always shoot what YOU want them to, they have a mind of there own and they'll let you know what they like.

Few combos have a tendency to shoot well over a broad range of rifles, but it does happen.

First thing I would do in your 7 and 300 is switch to RL-22. Then if the hornady's aren't shooting so hot, I would switch to a ballistic tip or AccuBond. One of those 2 bullets will most definately shoot, if not, something is wrong with your rifle, etc...