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7 LRM vs 7-300 PRC

blksno

blksno

I don't have one
Full Member
Minuteman
    • Mar 15, 2009
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    352
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    Is there any justifiable reason to have my 7mm Rem Mag rebarreled to 7 LRM when the 7-300 PRC seems easier to find components for, cheaper more better?

    The 7mm Rem Mag has had both barrels shoot sub 1/2 at 3140 for the first one....and 3105 for the 2nd...but I have a feeling this summer will be the end of the line.
    Just trying to make a plan for the future and I'm wondering if it's even really worth it to change.

    44851527_874393193346_7285922601845653504_n.jpg
     
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    I've been running a 7mm-300 win mag and love it. Brass is super easy to find and performance is great. I looked at the 7lrm and 7mm-300 prc and a few others and I just don't see the upside with the shortages
     
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    Schw15 said:
    I've been running a 7mm-300 win mag and love it. Brass is super easy to find and performance is great. I looked at the 7lrm and 7mm-300 prc and a few others and I just don't see the upside with the shortages
    Click to expand...
    With the numbers I have gotten...I'm not interested in changing unless it's to ditch the belt.
     
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    Been looking into this very same thing. What barrel lengths are y’all running? Single feed or mag length loads? I appreciate the details in advance!
     
    Any reason you’re not considering 28 nosler?
     
    rydah said:
    Any reason you’re not considering 28 nosler?
    Click to expand...
    It's a less efficient case designed.
    Longer case, shorter neck and less powder capacity isn't what I'm looking for.
    I realize it's very vary similar, 6 of one and a half dozen of another. The 28 Nos has never really interested me.
     
    TrevK said:
    Been looking into this very same thing. What barrel lengths are y’all running? Single feed or mag length loads? I appreciate the details in advance!
    Click to expand...
    First barrel was 23" I believe...and I'm pretty sure this one is 25"
    Running out of a CRF Win M70 with AICS mags
     

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    What about 280AI? I know this gets brought up a lot in 7mm discussion. Thoughts on that? Also, still new to precision shoot. The 7-300PRC breaks out to 7mm bullets in 300PRC brass? Same for 7-300WM with WM brass?
     
    cjs88 said:
    What about 280AI? I know this gets brought up a lot in 7mm discussion. Thoughts on that? Also, still new to precision shoot. The 7-300PRC breaks out to 7mm bullets in 300PRC brass? Same for 7-300WM with WM brass?
    Click to expand...
    Similar performance to 7 saum.
    An excellent cartridge.
     
    Steel head said:
    Similar performance to 7 saum.
    An excellent cartridge.
    Click to expand...
    That is what I decided on last year for my build, the 280AI. Reading and asking many questions here I found that, iirc, it has almost the same performance as the 7RM give or take 50fps or so but for less powder.
     
    cjs88 said:
    What about 280AI? I know this gets brought up a lot in 7mm discussion. Thoughts on that? Also, still new to precision shoot. The 7-300PRC breaks out to 7mm bullets in 300PRC brass? Same for 7-300WM with WM brass?
    Click to expand...
    The rifle is a Winchester M70 CRF with a magnum bolt face...so that's not really an option.
    And you're correct. The 7-300 would be a 300 PRC case, necked down to accept a 7mm bullet.

    cjs88 said:
    That is what I decided on last year for my build, the 280AI. Reading and asking many questions here I found that, iirc, it has almost the same performance as the 7RM give or take 50fps or so but for less powder.
    Click to expand...
    That may be the case if you're running mid-weight bullets with traditional powder...but a 280AI is going to fall quite a bit short, significantly short, of a 7Rem Mag with a heavy bullet and the right powder for the job.
     
    c_bass16 said:
    The rifle is a Winchester M70 CRF with a magnum bolt face...so that's not really an option.
    And you're correct. The 7-300 would be a 300 PRC case, necked down to accept a 7mm bullet.


    That may be the case if you're running mid-weight bullets with traditional powder...but a 280AI is going to fall quite a bit short, significantly short, of a 7Rem Mag with a heavy bullet and the right powder for the job.
    Click to expand...
    True didn't think about the bolt face. As far as the 280AI vs 7RM goes, you're telling me super reloaders can't get a 280AI to push heavy bullets like a 7RM does?
     
    cjs88 said:
    True didn't think about the bolt face. As far as the 280AI vs 7RM goes, you're telling me super reloaders can't get a 280AI to push heavy bullets like a 7RM does?
    Click to expand...
    Yes. That's what I'm saying.
    However...been wrong before.
    If you know someone...enlighten us.
     
    cjs88 said:
    True didn't think about the bolt face. As far as the 280AI vs 7RM goes, you're telling me super reloaders can't get a 280AI to push heavy bullets like a 7RM does?
    Click to expand...
    I’d think the 7 RM would have at least a 75-100 fps advantage for same barrel length and pressure
     
    I've had both and the 280 ackley is awesome but if you set the 7 mag right there's no comparison for handloaders.
     
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    Now the 7lrm has adg made brass with a gunwerks head stamp, around 88.7gr capacity. 7/300prc is 95.8 gr powder cap on my adi 120 scale. I had one built last year. I like the 7mags performance, but don't like belts. I run my 7/300prc at 26" 7mag speeds with a 22" pipe. I can run 180s up to 3130, 195s at 3k fps. It's hard on the barrel tho. I think the 7lrm with its long neck, non rebated rim and similar capacity to thw 7mag is the best balance. Yes it's proprietary brass, and dies have to come from gunwerks, and reamers aren't plentiful, but it's a solid case design. I think a 7lrm with RL26 or N570 will run a 195 at 3000-3030 with a 26" barrel, that's the mid node that a 28N runs with Retumbo.
     
    shootist406 said:
    ...I think a 7lrm with RL26 or N570 will run a 195 at 3000-3030 with a 26" barrel, that's the mid node that a 28N runs with Retumbo.
    Click to expand...
    I've already tested 190 Atips at 3040 with RL33 in a 25" 7mm Rem Mag.
    For the +180gr bullets...RL33 the key.
     
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    c_bass16 said:
    I've already tested 190 Atips at 3040 with RL33 in a 23" 7mm Rem Mag.
    For the +180gr bullets...RL33 the key.
    Click to expand...
    That's hauling some ass for a 7mag! Must be throated pretty long? Adg brass? Are you sizing above the belt with a Willis collet die to eliminate sticky extraction? RL33 and N570 have shown to give very similar speeds before pressure, equal throat erosion in my observance(65 max and 300nmi). My only complaint with 33 is the carbon buildup and lack of temp stability. RL33 does clean up once you get it up to higher pressures tho.
     
    shootist406 said:
    That's hauling some ass for a 7mag! Must be throated pretty long? Adg brass? Are you sizing above the belt with a Willis collet die to eliminate sticky extraction? RL33 and N570 have shown to give very similar speeds before pressure, equal throat erosion in my observance(65 max and 300nmi). My only complaint with 33 is the carbon buildup and lack of temp stability. RL33 does clean up once you get it up to higher pressures tho.
    Click to expand...
    I've had to run much much faster to get sticky bolt, I think it actually has a lot to do with the M70 CRF Action 🤷‍♂️🤷‍♂️. So I've not needed a special die persay. However...
    Part of the reason I'm considering a new cartridge is that I am currently using an RCBS Gold Medal Match neck die, followed by an older RCBS FL die without the expander and decapping rod. It's not ideal, but it's been working.

    Whatever I choose, I plan to switch to a FL die with a neck bushing. I've been slowly converting most of my dies to RCBS MatchMaster but that may not be an option without some die tweaks.
     
    I'm a huge 7mm fan and the 7 lrm seems like a almost perfect case. If you do switch let us know with what and how it goes. The 7 lrm and 7-300 prc are very close to the same.
     
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    Schw15 said:
    I'm a huge 7mm fan and the 7 lrm seems like a almost perfect case. If you do switch let us know with what and how it goes. The 7 lrm and 7-300 prc are very close to the same.
    Click to expand...
    I'm in agreement, I like the lrm case a lot! I built one back in 2015, one one the first lone peak razor ti action, believe it was ser# 13. I had 250pcs of weighted sorted Hdy brass from primal rights. I had 630 rounds down the barrel, when all that brass was toast, it could only last two firings with 180hyb @ 3020 fps. Believe it was 73gr H1000 from a 26" bartlein 8.5tw. At that point I pulled the barrel and went a different direction as the brass was abs garbage. Shot show 2018 gunwerks boys tell me new brass is right around the corner. However it took 2 years before ADG did a run for em. I have a bat vampire with no barrel, I think this would be an excellent case for that action.
     
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    shootist406 said:
    Now the 7lrm has adg made brass with a gunwerks head stamp, around 88.7gr capacity. 7/300prc is 95.8 gr powder cap on my adi 120 scale. I had one built last year. I like the 7mags performance, but don't like belts. I run my 7/300prc at 26" 7mag speeds with a 22" pipe. I can run 180s up to 3130, 195s at 3k fps. It's hard on the barrel tho. I think the 7lrm with its long neck, non rebated rim and similar capacity to thw 7mag is the best balance. Yes it's proprietary brass, and dies have to come from gunwerks, and reamers aren't plentiful, but it's a solid case design. I think a 7lrm with RL26 or N570 will run a 195 at 3000-3030 with a 26" barrel, that's the mid node that a 28N runs with Retumbo.
    Click to expand...
    I run my 7LRM with H1000 and get the 195s to 3k fps. I backed it off to ~2960 fps and it flat shoots.
     
    Last edited:
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    mkollman74 said:
    I run my 7LRM with H1000 and get the 195s to 3k fps. I backed it of to ~2960 fps and it flat shoots.
    Click to expand...
    That's good performance from the lrm. 26" barrel? I'm leaving 120+ fps on the table by running a 22" pipe, it's strictly a hunting rifle, weighs 6.8# minus optics. Plan was to run supressed but recoil is a bit much for spotting my own shots. It wears a brake now.
     
    shootist406 said:
    That's good performance from the lrm. 26" barrel? I'm leaving 120+ fps on the table by running a 22" pipe, it's strictly a hunting rifle, weighs 6.8# minus optics. Plan was to run supressed but recoil is a bit much for spotting my own shots. It wears a brake now.
    Click to expand...
    26" barrel
     
    I like the philosophy of the 7LRM.
    It isn't meant to be a hot rod, it is meant to handle the heavy bullets better than the remington.
    One of the issues is the single source for the brass.
    While it is excellent brass, it is very spendy.
    You can't buy the brass from ADG, they won't even confirm they make it.
    If starline would make it, I'd be all over it.
     
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    28 nosler is a huge barrel burner and they seem to have a lot of issues with carbon rings ect
     
    c_bass16 said:
    I've had to run much much faster to get sticky bolt, I think it actually has a lot to do with the M70 CRF Action 🤷‍♂️🤷‍♂️. So I've not needed a special die persay. However...
    Part of the reason I'm considering a new cartridge is that I am currently using an RCBS Gold Medal Match neck die, followed by an older RCBS FL die without the expander and decapping rod. It's not ideal, but it's been working.

    Whatever I choose, I plan to switch to a FL die with a neck bushing. I've been slowly converting most of my dies to RCBS MatchMaster but that may not be an option without some die tweaks.
    Click to expand...
    Try Whidden, same kind of deal
     
    Schw15 said:
    Maybe I should of read better are you saying there not very good?
    Click to expand...

    I only have one set of Whidden and the resizing die had to go back because it left a mark on the brass but they made it right. The seating die had issues with the seating stem galling up after a few years of use. I prefer redding type s full length bushing dies or forster dies for non bushing dies.
     
    Schw15 said:
    Maybe I should of read better are you saying there not very good?
    Click to expand...
    I've had 4, 3 were good one was really bad. It'd throw 4k runout no matter what I did. Switched to a matchmaster. For the price of whidden I feel there are better options available.
     
    shootist406 said:
    I've had 4, 3 were good one was really bad. It'd throw 4k runout no matter what I did. Switched to a matchmaster. For the price of whidden I feel there are better options available.
    Click to expand...
    Did they stop making the matchmaster
     
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