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300 Norma Improved 35 degree

Tekardi said:
Thank you for the print, wonder why you didn’t tight neck , I used 2425 with excellent result in Lapua brass
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I think you meant .3425"? Thats .0005" smaller than mine which is within allowable tolerances of the reamer itself. Most guys, especially hunters do not want to neck turn. The main thing of value here is the case body and dies have been worked out. You can order this reamer with any neck size or freebore you want, and you should based on you specific bullet or goals. I have them from .235"-.330" freebore because theres so many bullets out there. No one reamer covers them all.
 
Alex Wheeler said:
I think you meant .3425"? Thats .0005" smaller than mine which is within allowable tolerances of the reamer itself. Most guys, especially hunters do not want to neck turn. The main thing of value here is the case body and dies have been worked out. You can order this reamer with any neck size or freebore you want, and you should based on you specific bullet or goals. I have them from .235"-.330" freebore because theres so many bullets out there. No one reamer covers them all.
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Which dies pair up well with this print?
What freebore works best for 215-230 grain bullets?
 
Alex Wheeler said:
I think you meant .3425"? Thats .0005" smaller than mine which is within allowable tolerances of the reamer itself. Most guys, especially hunters do not want to neck turn. The main thing of value here is the case body and dies have been worked out. You can order this reamer with any neck size or freebore you want, and you should based on you specific bullet or goals. I have them from .235"-.330" freebore because theres so many bullets out there. No one reamer covers them all.
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Yes 3425 sorry that’s what I have now in my normal 300, thank you understood, I m using A tips 230 and 250 s with excellents results using 256 freebore but definitely I ll be going longer with your reamer specs I think ithey will work very well also, will post some results when ready , thank you again I ll be waiting patiently for the dies to show up
 
I recovery this 230S a mile away it was really steady using 1-8 twist when it banged a tank wheel that had a rubber outlet , the tip was intact but had to take it with a nailF0C047F7-19B3-425F-9CEE-8813BBFC9616.jpeg
 
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LA50SHOOTER said:
For the 230's on up Kyle, - I'd go with the H50BMG rather than 24N41 and never look back. - H50BMG is a good powder in over-bore and large capacity cases - period. - I love it in a 35" barrel in 30-378 with 230's.

Another group of powder(s) you may want to consider and this is based on both price and availability is surplus WC-860, WC-867 & WC-872. - These can be had for $60-$70 bucks for an 8 pound jug (plus shipping & Haz-Mat). And they are available.
The thing about the surplus ball powders is there can be considerable Lot-To-Lot variations, and they seem to want to operate good at +90% case fill & up. - Also in hot climates they can exhibit pressure spikes where loads were developed in cooler temperatures. - So, its a matter of managing the pressures in relationship to temperatures. - The old Hodgdon H-870 was "touted" as a "go-to-powder" back in the early days for big over-bore magnums, - it was a surplus military powder, but Hodgdon ran out of it so it's not on the market.
The ones I've mention are similar to the H-870, and for WC-872 I use H-870 in Quick-Load to find my starting point when I develop loads.

I'm not trying to steer you away from H50BMG at all, you've probably picked one of the Best powders for Heavy Bullets in the 300 Norma Mag Imp. - Just pointing out that there are options available for these larger capacity cartridges.

All The Best ! - Ron
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I used H870 in my norma for the K2M Argentina with 250 s with great results, we can still find that from surplus 20 mm Vulcan very cool powder for barrels used 90 grn in a 28 inch getting 2910 fps , nice to hear someone used them before
 
I was curious on how often and how far down you take your barrel when cleaning the 300 Nmi? I usually take mine down all the way to no carbon/copper after every shoot. Averaging about 30-50 rounds. Last time I was out, I noticed that on a clean barrel, it doesn't reach its normal speed until about 9-10 rounds. After that round count, it settles in and shot 12 rounds with 6.2 Sd. But first 10 gradually got faster until settling in. I clean after every outing to keep the carbon from getting too tough. But it seems that it takes more than "3 foulers" to get this cartridge to pick up speed after a down to metal cleaning. Can I get away with more round counts before cleaning?
 
h24 said:
I was curious on how often and how far down you take your barrel when cleaning the 300 Nmi? I usually take mine down all the way to no carbon/copper after every shoot. Averaging about 30-50 rounds. Last time I was out, I noticed that on a clean barrel, it doesn't reach its normal speed until about 9-10 rounds. After that round count, it settles in and shot 12 rounds with 6.2 Sd. But first 10 gradually got faster until settling in. I clean after every outing to keep the carbon from getting too tough. But it seems that it takes more than "3 foulers" to get this cartridge to pick up speed after a down to metal cleaning. Can I get away with more round counts before cleaning?
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I try to clean with solvent and a snake every 50 rounds and full boretech carbon and cooper every 200 rounds , If I clean every time first 5 rounds groups open with the load development that I always use
 
h24 said:
I was curious on how often and how far down you take your barrel when cleaning the 300 Nmi? I usually take mine down all the way to no carbon/copper after every shoot. Averaging about 30-50 rounds. Last time I was out, I noticed that on a clean barrel, it doesn't reach its normal speed until about 9-10 rounds. After that round count, it settles in and shot 12 rounds with 6.2 Sd. But first 10 gradually got faster until settling in. I clean after every outing to keep the carbon from getting too tough. But it seems that it takes more than "3 foulers" to get this cartridge to pick up speed after a down to metal cleaning. Can I get away with more round counts before cleaning?
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Just depends on the barrel. I’ve had some settle in after 2-3 shots and some that took a dozen rounds. Pay attention to the accuracy on paper, not what your chronograph says and your barrel will tell you how many fouling shots it really needs.

If you want to clean with longer intervals then use a bore scope to see how much carbon you have in the neck and throat area. If unsure what too much carbon looks like you can also shoot it until accuracy falls off and you’ll know when it’s a good time to stop and clean before that happens. And maybe don’t clean so hard. You can play with it to work out a cleaning regimen that makes the barrel shoot good all the time.
 
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Ok, I use a borescope when cleaning. I was taking it down to metal after every shoot, to try to keep the carbon out of the neck area. It seems way harder to get it clean after I run more than 50 rounds down it also. I'm working up loads for Elr, so I'm trying to respect the S.d's. I know when shooting my other rifle at distance, and I'll get burned off target with a 20+fps variance. Not using a chronograph, you can get chasing your own tail. Say on the first shot, If I drop one in low, but it was because of a lower velocity, but I didn't know, a person would naturally try to correct and hold over. Then if the next round is closer to your average velocity, and add in the holdover, then your're over the plate. A 20fps variance at 2000m with my Norma is a 32" difference, the plates are 36" in size.
 
Alex Wheeler said:
Here it is. This is designed to have a crush fit on new Lapua cases. You can use a standard go gauge and chamber it short to get that crush or buy the gauge for this reamer. The freebore on the reamer is a compromise for the 230 and 245 Berger hybrids. Bullet Central will be making the dies for this again soon.

View attachment 1303189
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No news from bullet central to buy the dies ….any update?
 
What are you guys all loading for fireforming ? I just completed my rifle; 28" 1:9 1.350" Bartlein 5R barrel with 35 degree improved chamber and .343NK, .240FB, mag fed, Borden Bigfoot action, shooting with brake or suppressor interchangeably. I have factory Berger 215gr loaded ammo, and some Factory 230gr Berger ammo once I break in the barrel.
 
Was also wondering if anyone used the cream of wheat with faster burn rate powders to get a 90 percent case blowout prior to shooting the bullets to help conserve barrel life. If so what is your load recipes? Thanks
 
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