7-300 Norma Mag Improved

BCX

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Anyone here have first hand experience w a 7-300 NM improved 30*?
 

Bradu

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I believe there are a couple members here running that round so they should be along shortly. I was going to go improved but the gunsmith had a regular 7-300 norma reamer so I just went that route. Not sure when my barrel will be here though. I'm thinking BJay has the improved version.
 

BCX

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I just purchased a LA MAG .590 bolt face and i already have a Bartlein 5R 1-7.5 twist barrel. O what to do with it?
 

surgeon260

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What type of information are you seeking? I don't own a 7-300 NM Improved, but I have shot one a bit (I do own both 300 and 338 NM Improved rifles). Sierra 197s at 3250 with RL33 and a 30" barrel. Pretty brisk recoil in a hunting weight rifle. In general I am a huge fan of the Norma mags. If you are wanting an extreme 7mm, the 7-300 NM would definitely be my choice. Barrel life will obviously be extremely short, but anyone building a 7-300 knows what they are getting into. I would go with a minimum of a 28" barrel to really bring it to life. 30" would be better.
 

Bradu

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I went with a 30" barrel for my Desert Tech, I bought the dies and bushings needed so I'm ready to start necking down brass
 

BCX

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I figure barrel life is 700-800 rounds? What is the preferred reamer? Is there a no turn neck reamer?
 

Butler12

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I have a 7mm-300 Norma imp 40 degree built on a Stiller tac 338 I had it built with 2 barrels . It shoots amazing will last a long time as a pure hunting rifle . It has a fluted 30" barrel 12lbs with March 3x24 scope . I do not think I would go 40 degree again but at the time the gunsmith had the reamer and dies . As with all overbore calibers shoot it cool and it will last. It sure is a flat shooting wind cheating cartridge. Shooting steel with it gives you confidence to take ethical shots on game at longer distances it truly has a ballistic advantage running 195 bergers at good speeds. I ran the numbers though JBM before building it and out to 1000 it smoked nearly everything while still being comfortable to shoot. Enjoy!!!
 
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BCX

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Fire forming brass or using a hydro die? My concern is killing half of the barrel life due to fire forming brass.
 

Butler12

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Hi,
I am fire forming. But they are a super load on there own. Mind you I pulled up at 50.
 
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Bradu

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Fire forming brass or using a hydro die? My concern is killing half of the barrel life due to fire forming brass.
I would only fireform 50 or 100 depending on how much you will shoot that rifle. No point in doing a bunch if you are only going to shoot 25 or 30 when you take it to the range. 100 pieces should last the life of the barrel and fireform loads can still be a great load just a little slower. Hydroforming gets it close but you will still have rounded shoulders that need fireformed from the research I've done on it. I considered it for another ackley cartridge that I have.
 
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ForeverZ01

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I have a hydroforming die from Whidden for the 7mm-300 norma improved 30 degree. I have 100 lapua brass fireformed and ready to load. Have an extra 100 300 norma lapua brass ready to form.
 

Bradu

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Wanna sell some 300nm lapua brass :))
I've been looking at a case forming die and buying 423 dakota brass to make my own. It doesn't seem like Lapua brass will be available anytime soon.
 
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BCX

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I have a hydroforming die from Whidden for the 7mm-300 norma improved 30 degree. I have 100 lapua brass fireformed and ready to load. Have an extra 100 300 norma lapua brass ready to form.
PM sent
 

ForeverZ01

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Did load work up on mine yesterday and worked up to 96.5 gr of rl33 with 195 berger and it yielded 3384 FPS, I probably could have gone a little higher but on high temp Louisiana days this could get into pressure. Humidity was around 60% and temp was 70.
 

Eshu

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I have a 7mm-300 Norma imp 40 degree built on a Stiller tac 338 I had it built with 2 barrels . It shoots amazing will last a long time as a pure hunting rifle . It has a fluted 30" barrel 12lbs with March 3x24 scope . I do not think I would go 40 degree again but at the time the gunsmith had the reamer and dies . As with all overbore calibers shoot it cool and it will last. It sure is a flat shooting wind cheating cartridge. Shooting steel with it gives you confidence to take ethical shots on game at longer distances it truly has a ballistic advantage running 195 bergers at good speeds. I ran the numbers though JBM before building it and out to 1000 it smoked nearly everything while still being comfortable to shoot. Enjoy!!!
Who was the gunsmith with the reamer and dies?
 

BCX

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It’s a cartridge I wanted to play with. Ideal setup is running a 2 barrel system. One burner barrel for fire forming. Barrel life must be 600ish?
 
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Eshu

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Mar 9, 2019
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I have a 7mm-300 Norma imp 40 degree built on a Stiller tac 338 I had it built with 2 barrels . It shoots amazing will last a long time as a pure hunting rifle . It has a fluted 30" barrel 12lbs with March 3x24 scope . I do not think I would go 40 degree again but at the time the gunsmith had the reamer and dies . As with all overbore calibers shoot it cool and it will last. It sure is a flat shooting wind cheating cartridge. Shooting steel with it gives you confidence to take ethical shots on game at longer distances it truly has a ballistic advantage running 195 bergers at good speeds. I ran the numbers though JBM before building it and out to 1000 it smoked nearly everything while still being comfortable to shoot. Enjoy!!!
Who was the smith?
 

AussieMike

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Jun 3, 2020
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I would only fireform 50 or 100 depending on how much you will shoot that rifle. No point in doing a bunch if you are only going to shoot 25 or 30 when you take it to the range. 100 pieces should last the life of the barrel and fireform loads can still be a great load just a little slower. Hydroforming gets it close but you will still have rounded shoulders that need fireformed from the research I've done on it. I considered it for another ackley cartridge that I have.
Hi I bought a rifle yesterday that sounds a lot like the one you described above you didn’t happen to sell it to a guy from Australia?
 

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AussieMike

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No, I still have it.
Mine is a Texas built on a Stiller Tac338 receiver w/ 20 moa Rail, PTG .300 Recoil Lug, Lilja 29'' Fluted Sendero 1-8'' Twist with seamless JP Enterprises Coolie Brake installed. Cerakoted in graphite black and chambered in the Wildcat, 7mm/300Norma Improved 40-degree shoulder. The gun was built to fire both the Berger 180 and 195's. Stock is bedded manners T5A and is cerakoted brown over coyote tan with the Mandilorian emblem on each side comes with Lilia 1 in 8 twist fluted barrel with JP enterprise brake set up for 180 and 195 Berger bedded into a Manners T5A comes with a spare new Benchmark 1 in 8 twist cut with the same reamer with a Badger Ordnance thruster brake and came with custom Whidden dies and 91 formed cases and weighs 5kg on bathroom scales.