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Hi, got a 7RM tikka and have loaded up some 162eld x to mag fit at 3.34 COAL. Got a pretty mild charge of imr4831.
Still seems a bit deeper into the cartridge than id like.
What COAL are others running with 7RM in tikka with this pill.
Just a bit nervous after a sticky bolt blown primer experience trying to fit the 150eld x into a COAL limited 284win
Talk to kiwi greg, he knows how and can alter your mag.
I would not it if need be. Just wondering if people are loading them in std mag. Anyone have data or a measurement of the Hornady precision factory ammo?
The Hornady Book spec for 7mm rem mag w/ the 162ELDX is 3.290" / 83.566mm COAL.
Personally I would load it as long as the mag would allow - then unless it is shorter than the 83.566mm COAL specified in the Hornady book then you should be ok to seat it to mag length and use the book data as a starting point.
If your load is shorter than the 83.566mm book length, then start a couple grains lower to take into account the reduced capacity of your load vs the published data.
Sweet man, that's the same as the btsp pill then. All good as I'm loaded 50thou over that length.
Cheers
No probs.Quote:
Originally Posted by stevodog
FYI if you don't have the book - at 83.566 COAL with IMR4831, Hornady's start load is 51.7gr and max is 60.6gr.
The hogdon data shows max load at 61.8 which would make my start load of 60.5 near max on hornadys book.
Also velocity is 2877 on hogdon at that and 3000 on Hornady at 60.6gr.
Quite a discrepancy. Anyone kind enough to do a quickload check on these would be much appreciated.
As far as I can see, the Hogdon data only shows data for a 162gr "soft point boat tail".
A 162gr spbt is going to be a shorter projectile than a 162gr ELDX meaning that when loaded to the same COAL, the projectile in Hogdons data is going to take up less internal case capacity allowing for a higher charge weight.
I would trust the Hornady data to be on the safe side. Theirs takes into account 162gr projectiles of differing lengths, including really long ones like you are using.
Yes, that makes sense. I might buy the Hornady book so I can have a proper squizz.
I haven't measured the chamber but it's a 24inch barrel
pm sentQuote:
Originally Posted by stevodog
Could a kind soul run loads through quickload please.
7RM hornady162eld x 60.5gr imr4831 24inch barrel. Unknown jump.
And the same with 162gr Hornady btsp.
Much appreciated.
Thanks, but that doesn't help me
I load 64 grains IMR 4831 for the 162 Amax 2950 fps coal 85mm no pressure signs in my rifle and shoots sub MOA
Thanks man, that is commensurate with the data that I have. I'm starting at 60.5gr and 3.340.
Apart from my 284win experience I have loaded elds in 260rem and 6.5 x 55 to good effect as I've not been hampered by mag length and been able to work a jump to the lands that suited.(in the 260 anyway)
thanks for your help good sir.
I stuck it in quickload. Iv got an older version which doesent have the 162eldx, so I ran it with the 162Amax which should be fairly similar being a reasonably long projectile. Id think the ELDX will operate at slightly higher pressure again if run at the same COAL.
I can manually load the projectile if you advise the projectile length, the diameter at the bottom of the bullet, and the distance from the bottom of the projectile to the top of the boat tail.
Using the 162amax, 60.5gr of IMR4831, at a COAL of 3.340" we are right at the very high end of what would be considered safe to test. It would certainly not be considered a starting load and that much pressure should be worked up to.
Generally in the pink, it might be ok depending on the firearm, you may or may not have bad pressure signs but its getting up there, and in the red is real danger zone. Its right on the borderline of the red zone, too close for comfort without working upto it. It would take something very minor for you to be over - eg if your brass has a couple grains less capacity than the data iv run it with etc. I believe the ELDX loaded to that same COAL will take you firmly into the red zone seeing as it will eat up a couple gr more of your case capacity (same result as having brass with a couple less grains capacity).
By all means test a few of your loads, id think that the worst that would happen is you might blow some primers and scar up your bolt face, but I would advise if you go out for a range day take some other ammo with you as the chances of finding out that ammo is too hot and being left without any ammo to shoot is fairly high
Attachment 122100
I thought it would be informative to also show the data for the 162gr BTSP that the load data used related to, to show the difference that the projectile makes.
We can see that with the exact same load details, the only difference being the projectile used, the pressure on the 162btsp is significantly lower than that of the 162Amax (and the ELDX)
Attachment 122101
I run 63.5gr IMR4831 with the 162 ELD-X in my tikka rem mag. It is loaded for 20 thou jump and is single feed (too long for the magazine). It wouldn't shoot for me at mag length. Sorry I don't have my COAL as I don't have my book in which it is recorded.
Cool thanks Chris, the quickload data validates the Hornady load data as far as charge weight and pressure are concerned. That Hornady book sure is a crazy way to present data though as it makes the data for the shorter bullets pretty irrelevant.
I will pull my loads and come in a bit lower as a result.
Thanks a lot, you have been very helpful.
Good to know Stagstalker. If they don't work at mag length I will use some speer btsp and single feed the elds if the POI is not too dissimilar.
I've loaded up a ladder with speer btsp and will seat the elds out where they belong and single feed them at a later date.
The 7RM is replacing a 6.5PRC that I was unhappy with so is more cartridge than I need really.
So why were you unhappy with the 6.5PRC.Quote:
Originally Posted by stevodog
I'm interested to know.
Sent from my CPH1903 using Tapatalk
There was a mag. fit issue that didn't look like being resolved. The cartridge was my preference but I couldn't spring for a semi-custom.
Hey mate I'm using the 162 eldx in my sako A7, got the same restrictive overall length of 3.34" and it shoots sweet as. No excessive pressures as long as you work up to your load etc.
Good to know. Ill have another play in a bit
AR 2217 is the powder to use. I found AR 2225 too bulky and AR2213sc was really good for accuracy and consistency but just didn't give the speed I wanted. AR 2217 on the other hand ticks all the boxes for me. The eldx and eldm don't seem to mind the bit of jump in my rifle, nor do they seem to mind in a mates t3.
As a side note, I've also played around with the even longer 175 eldx at the same overall length (3.340) with AR 2225 and had no over pressure issues there either.
Interested to see how you get on :thumbsup:
Cool man, ill load up a ladder soon. I'm using imr4831 but only because I have it here. Will defo get onto the 2217 as it seems a favourite.
