7mmRM project

Ok team,

So this rifle isn’t new to the forum as I brought off another lad one here. His thread from 2016 didn’t really amount to much so I am hoping to get some fresh information to help shape what I do next. (And to check that what I am looking at all adds up)

What is the rifle: Rem 700 XCR 2 7mmRM

What gear do I have:
Brass - Winchester, norma and misc. (will just stick with one)
Powder - AR2225
Primer - Fed .210 (trying these as I have been told it may reduce extreme spread)
Projectile - 162 ELD X

Rife OAL cap = 93.48mm (from what the last owners notes say)
Current rounds sit at 85mm overall length. (Just under 10% reduction)
Bullet comparator reads 68mm
Land marks;

https://uploads.tapatalk-cdn.com/201...e2e9da2528.jpg

Disclaimer: I realised after I purchased that it only has a 22” barrel + a DPT can. So I understand that I will loose around 100fps from the stock 24” which likely means I wont hit 3000fps or have the longer 800m+ stability of the projectile.

Aim: Is to hit 2850-2900fps, and group 1 MOA +/- @ 100m

Intent: Use rifle mainly for 300-700m with good “boom flop” on Reds.

Information requirements/talking points:

Can someone please provide me with the Hornady/Powder tolerances and average fps, I believe its measured off a 24” barrel so I will take 100fps off until I get my hands on a chronograph.

It looks like 73.5gr of AR2225 was used in the past but with quite a large deviation (2850-2900fps) was achieved, which would explain slightly larger grouping.
I’m hoping that if I tighten up the tolerances in hand loads (inc. prep/trimming), that I can hit 2900fps with 74gr and Fed .210 primers (vs .215) and keep good MOA accuracy. Will work from 73gr up to max recommended. Otherwise I guess 2860fps +/- will have to do.

What are peoples experience with this sort of set up?

Should I just bite the bullet and get a 24” barrel?

Would it be worth while dropping the the projectile weight to get the fps and or nah? (Understanding that fps doesn’t = accuracy over distance)

Note: Already have a 7mm08 hitting 2770fps, sub MOA with Nosler BT 140gr. So I want better kinetics past 300m.

Cheers in advance.

HK

I wonder with the 22" barrel AR2217 might be better? AR2225 is mighty slow, goes well in a 24-26" barrel.

Nothing wrong with a 22 inch barrel in 7mmRM. Pretty sure Duleys get decent results with 20" version so I wouldn't worry too much. Mate owns a 22" and regularly shoots 5-600m with no issues at all.Attachment 105961

Quote:

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Originally Posted by Hunty1

I wonder with the 22" barrel AR2217 might be better? AR2225 is mighty slow, goes well in a 24-26" barrel.

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Fair point. Anyone else in this ball park/have some spare in the Manawatu I can use to compare against 2225?


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Just for anyone else looking at the data, these are ADI equivalent;

https://uploads.tapatalk-cdn.com/201...fea5d8c06a.jpg


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No mucking about here mate, 72 grains of 2217 with 12 thou jump and go for the win!

Quote:

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Originally Posted by McNotty

Nothing wrong with a 22 inch barrel in 7mmRM. Pretty sure Duleys get decent results with 20" version so I wouldn't worry too much. Mate owns a 22" and regularly shoots 5-600m with no issues at all.

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Im guessing the red on the graph is max recommended? Quite a bit lower than 73-74gr?

Quote:

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Originally Posted by Gibo

No mucking about here mate, 72 grains of 2217 with 12 thou jump and go for the win!

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I’m pretty keen to give the 2217 a crack. Will take the 2225 back. I’m guessing it’s faster burning with a big bark and jump? (Pull the titty and hold on!?)

Also noted HF have the AR 22 available...


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Just work up from 69 to be safe mate, each rifle is different. My Rem700 was at 72.1 of 2217 in Hornady brass of all things doing 3010. 26" barrel

Sorry that's with the old 162 amax.

Quote:

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Originally Posted by Hunter_killer

Fair point. Anyone else in this ball park/have some spare in the Manawatu I can use to compare against 2225?


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@stagstalker have you got any 2217 spare?
Yea, red is max. But you could find your rifle doesn't mind over max. Seating depth in relation to lands will also affect pressure. Sorry for the shit image, if you need a clearer one flick me a PM.

Quote:

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Originally Posted by Gibo

Sorry that's with the old 162 amax.

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Same/same from what I have read. I noted the AR 22 stuff uses less powder but is more expensive, so the 2217 sounds like a good option.


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I haven't had experience with a 7mmRM but can bang some figures through Quickload for you if you want

22" barrel shouldn't cause problems for what you're hoping to do. I'm chucking a 186 Berger VLD @3050fps out of a 21.5" barrel.

Win M70, 168VLD, Fed 215 primer, Norma brass and 74.5gn 2225

Quote:

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Originally Posted by winaa

I haven't had experience with a 7mmRM but can bang some figures through Quickload for you if you want

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That would be real useful. Is Quickload an app?
Will run; Fed .210’s, 2217 (up 68gr+), Win brass, 162eldx, 22” Remington barrel (down from 24”)
https://uploads.tapatalk-cdn.com/201...5590a7c502.jpg


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Quickload is a windows program it's just a prediction but can be tuned to be quite accurate.
Results for ADI max charges using 162 eld-x instead of 162 spbt 22in barrel, your 63.5 OAL and default case capacity
ADI 2213 64Gr 2846 FPS 97% Burnt
ADI 2217 70Gr 2907 FPS 99% Burnt
ADI 2225 73.5Gr 2964 FPS 100% Burnt (109.7% fill)

I use 71 grs of 2217 with the 162 gr ELD X for about 3040 fps out of a Rem 700.

Quote:

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Originally Posted by Mooseman

I use 71 grs of 2217 with the 162 gr ELD X for about 3040 fps out of a Rem 700.

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Thanks for that mate. Probably what I will land around. What primers, and I’m guessing that’s a 24” barrel?


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Quote:

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Originally Posted by winaa

Quickload is a windows program it's just a prediction but can be tuned to be quite accurate.
Results for ADI max charges using 162 eld-x instead of 162 spbt 22in barrel, your 63.5 OAL and default case capacity
ADI 2213 64Gr 2846 FPS 97% Burnt
ADI 2217 70Gr 2907 FPS 99% Burnt
ADI 2225 73.5Gr 2964 FPS 100% Burnt (109.7% fill)

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Hey that real handy mate. The burn rate... is it optimal/recommended 100%? I’m guessing that means that powder has fully burnt prior to leaving the barrel...? Cheers


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That's the amount of powder burnt in the barrel, surprised me that by the slower powder all burnt but it's a pretty compressed charge.

Quote:

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Originally Posted by winaa

That's the amount of powder burnt in the barrel, surprised me that by the slower powder all burnt but it's a pretty compressed charge.

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The OAL you quoted me... is that factory? I’m working off 68 from previous measurements atm...


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Quote:

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Originally Posted by Hunter_killer

The OAL you quoted me... is that factory? I’m working off 68 from previous measurements atm...


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Got that length from your first post, comparator measurements are no use to Quickload it needs to be from tip to base
ADI Manual OAL is 3.290 or 83.6mm

Quote:

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Originally Posted by winaa

Got that length from your first post, comparator measurements are no use to Quickload it needs to be from tip to base
ADI Manual OAL is 3.290 or 83.6mm

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Ok, I think I have figured it out. So those stats are based on the OAL that I provided and then ADI has taken the recommended % off, for good seating depth? So am I right in assuming that I should be able to seat them a bit further back than they are atm (85mm - well on the lands) to 83.6mm? I think thats reasonable, my first pic looks like the projectile is well in the land anyway (second opinion?).




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Quote:

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Originally Posted by Hunter_killer

Ok, I think I have figured it out. So those stats are based on the OAL that I provided and then ADI has taken the recommended % off, for good seating depth? So am I right in assuming that I should be able to seat them a bit further back than they are atm (85mm - well on the lands) to 83.6mm? I think thats reasonable, my first pic looks like the projectile is well in the land anyway (second opinion?).




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Edit;
Excuse my lack of knowledge here...(hence why I have started this thread)

Whiteboard marker test is showing average of 83.6 CaseOAL. (Projectile pushed into case up to where land marks stop) Guessing I’m missing something? Do I back the round off by a further 10%? *confused face* or leave it?

Help much appreciated.


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Unless you’re experienced and can take pretty fine measurements, most people back off from lands 20 thou (0.5mm) and start playing with seating depth from there.

Quote:

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Originally Posted by winaa

Quickload is a windows program it's just a prediction but can be tuned to be quite accurate.
Results for ADI max charges using 162 eld-x instead of 162 spbt 22in barrel, your 63.5 OAL and default case capacity
ADI 2213 64Gr 2846 FPS 97% Burnt
ADI 2217 70Gr 2907 FPS 99% Burnt
ADI 2225 73.5Gr 2964 FPS 100% Burnt (109.7% fill)

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I see the point of confusion here I typed 63.5 OAL where in fact I used 85.0 OAL as stated in your first post. I was looking at the "case length' when i typed it.
Sorry for the mix up

Quote:

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Originally Posted by winaa

I see the point of confusion here I typed 63.5 OAL where in fact I used 85.0 OAL as stated in your first post. I was looking at the "case length' when i typed it.
Sorry for the mix up

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All good mate, yeah that fully confused me lol.(as you can see by the posts)

Half my fault as well, probably used the wrong terms?

WB marker test (average of 5 dummy rounds) shows
87mm OAL - projectile pressed into dummy case.

CaseOAL on left over cases from prev owner were was set at 85mm. However these were AMAX, not ELDX. Pretty similar though.

The 90+ measurement above included the comparator I believe. (So disregard)
Comparator measurement was 68mm. With 83.6 COAL it would read 66.6mm

Can we use OAL of 87mm and see what the recommended seating depth is for ELDX? Or is 83.6 default from the book?

I have a funny feeling that COAL 85mm is probably sound, I’m just trying to get my head around “the reason why?” rather than using old data.

Feedback welcome.

Cheers

HK




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I think I have some 2217 left over here in manawatu you could try if you wanted. My rem mag flat out hated it with the 162 ELDX haha. Using IMR 4831 now.

Quote:

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Originally Posted by stagstalker

I think I have some 2217 left over here in manawatu you could try if you wanted. My rem mag flat out hated it with the 162 ELDX haha. Using IMR 4831 now.

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What length barrel are you running? I have some for now, but thanks for the offer mate.


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Quote:

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Originally Posted by Hunter_killer

What length barrel are you running? I have some for now, but thanks for the offer mate.


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Tikka 24” factory fluted barrel mate.

UPDATE:

So Im running comparator length of 66.6mm.
Standard 7mmRM rounds have a OAL of 84mm, these sit at 83.6mm.

Tested 68 - 70.5gr of 2217 with .210 primers.

68-70gr group relatively the same at MOA at 100m. (Recommendation is 68.5gr)

70.5gr was a larger group of around 2MOA. Could have been that shoot though.

Plan is to run through a Chrony now and see what fps I am achieving with the 70gr.

Depending on velocity, I’ll either leave it as is or move the round closer to the lands.

Thanks for the advice so far. Has been a good learning experience.

HK


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