6mm Dasher Norma freebore

[PAshooter20BR]

What is the optimal freebore for the NORMA dasher to run the 105 hybrids? Would I also be able to run the 107 sierras with the same freebore? It seems the PTG reamer that was set up when the brass was made by Norma had a 104 freebore. Technically wouldn’t this be longer than a standard lapua dasher with 104 freebore since the Norma case is 50/1000 longer? Doesn’t freebore go off of case mouth? I just want the bearing surface of the bullet out of the neck shoulder junction.

Thanks

 

[Dusty Stevens]

freebore is off the case mouth. the .104 will have both of those bullets well out of the junction with that brass.

 

[PAshooter20BR]

Does it put them out too far ? If lapua dashers are 50/1000 shorter and they run a 104 to 123 freebore and this Norma dasher is 50/1000 longer in case length wouldn’t it compare as a 154/1000 freebore ? What the heck am I missing? Someone help me please.

 

[Dusty Stevens]

Does it put them out too far ? If lapua dashers are 50/1000 shorter and they run a 104 to 123 freebore and this Norma dasher is 50/1000 longer in case length wouldn’t it compare as a 154/1000 freebore ? What the heck am I missing? Someone help me please.

Nothing. The norma dasher will have more neck so youll have more bullet in the case at a comparable fb to a lapua

 

[PAshooter20BR]

Will they be too far out ?

 

[mikeeg02]

Look at the reamer print, then look at a standard dasher print. You'll see the length difference is in the neck length(resulting in an overall longer case length) You can run the same free bore in both cases. But in order to use that brass without trimming it down, you need to have a reamer with a longer neck. No change in the freebore is necessary, as the free bore starts after the neck. (And the taper from the neck to the free bore). The guys around here run more free bore than that in lapua brass.

 

[PAshooter20BR]

I did originally did look at the reamer print. My thoughts were the lapua dasher and Norma dasher have the exact same base to neck/shoulder junction length. Therefore by making the Norma dasher neck 50/1000 longer than the Lapua dasher, and the freebore being measured off the case mouth would make the bullet be 50/1000 out further from the neck shoulder junction on the Norma brass than the lapua if each reamer had a freebore of 104/1000. ???... yes / no?

 

[mikeeg02]

Depending on who's print, the neck/shoulder junction is very close.

But yes, if both cases have the same free bore, same length to the neck/shoulder junction, and same 45* neck to free bore angle, and the bullet seated at touch would be .050" further from the neck/shoulder junction with the grizzly norma dasher reamer..

 

[Dusty Stevens]

Does grafs sell that brass yet?

 

[PAshooter20BR]

No sign of the brass yet. So why would they design a reamer for this Norma brass with 104 freebore if in essence it’s really like 154 freebore in comparison to to original lapua? It seems a lot of dasher shooters run somewhere from 104 to 123 freebore so why wouldn’t it be more optimal at like an 80 freebore to accommodate the longer neck?
Thanks for all the help already!

 

[mikeeg02]

No sign of the brass yet. So why would they design a reamer for this Norma brass with 104 freebore if in essence it’s really like 154 freebore in comparison to to original lapua? It seems a lot of dasher shooters run somewhere from 104 to 123 freebore so why wouldn’t it be more optimal at like an 80 freebore to accommodate the longer neck?
Thanks for all the help already!

Because it's not the same as 154 free bore. It's the same as the standard dasher, that accommodates the longer neck so you dont have to trim.

It puts the bullet in the same place from the end of the neck into the case. Keeping you that much further from the donut area, while having the longer neck which was/is supposed to help with throat life on a dasher.

I know some williamsport guys that run .150 or so free bore with lapua cases. When I shot a dasher, I used my buddies reamer with .170 free bore with lapua cases and 105 hybrids, and it shot very well.

 

[dkhunt14]

No sign of the brass yet. So why would they design a reamer for this Norma brass with 104 freebore if in essence it’s really like 154 freebore in comparison to to original lapua? It seems a lot of dasher shooters run somewhere from 104 to 123 freebore so why wouldn’t it be more optimal at like an 80 freebore to accommodate the longer neck?
Thanks for all the help already!

Most 1000 yard guys are using .135 to .155 freebore. Almost everybody at Williamsport using .155. I would not use less then .135 in a Dasher. You get less pressure with the bullet out farther and you stay away from Donut troubles. Matt

 

[oldduc]

Does grafs sell that brass yet?

Not yet. I talked to Norma USA a few weeks ago and they said Grafs should have it during October (which is about gone). I have some on back order with Grafs.
~Gary

 

[Dusty Stevens]

Building a rifle around norma dasher brass is just about like buying a br rem chambered rifle.

 

[luckyshot52]

If you use an original Dasher reamer you would have a longer FB. If you use a Norma Dasher reamer you would have the 104 FB.
Assuming both reamers ground to your 104 FB you used as an example.

 

[LRPV]

How does this answer the original posters question or help him? Guess it’s easier to just have a smart ass answer than actually help.

Pashooter I think your on the right track of the Norma is 50/1000s longer then your freebore would be .154. Going by some of the other helpful replies as to the 1k shooter at Williamsport using no less than .135 FB I think you should go with the .154 freebore and be done. Good luck and let us know what you end up going with and how it shoots.

It’s not a smart assed comment. It’s trying to keep a guy from making the mistake of planning a rifle around brass that has proven to be junk when compared to Lapua and is at the moment not even on the market with only the promise that it ever will be available. A 104 free bore has been used with the Norma brass because it allows you to stay out of the NSJ with the base of the bulket while still leaving you the full length of the neck to chase the lands.

I personally run a 115 free bore Henriksen reamer based off Lapua brass. It turned out perfect for me. On a fresh chamber, with a 103 Vaportrail it leaves the boat tail right at the spot that my Harrels die stop sizing the neck. It basically allows me to get 5-600 rounds on a barrel to be at the same point as a fresh 135 reamer of the same make that after 5-600 rounds I feel like I’m out of neck to continue to chase the lands.

 

[Dusty Stevens]

It’s not a smart assed comment. It’s trying to keep a guy from making the mistake of planning a rifle around brass that has proven to be junk when compared to Lapua and is at the moment not even on the market with only the promise that it ever will be available. A 104 free bore has been used with the Norma brass because it allows you to stay out of the NSJ with the base of the bulket while still leaving you the full length of the neck to chase the lands.

I personally run a 115 free bore Henriksen reamer based off Lapua brass. It turned out perfect for me. On a fresh chamber, with a 103 Vaportrail it leaves the boat tail right at the spot that my Harrels die stop sizing the neck. It basically allows me to get 5-600 rounds on a barrel to be at the same point as a fresh 135 reamer of the same make that after 5-600 rounds I feel like I’m out of neck to continue to chase the lands.

I actually run a .123fb for general applications and a .155 for 1000yd. Both of them work well with every 103-105 bullet ive tried. And thank you for explaining why i said what i did. I know of too many stuck with the long neck quandry right now and hate to see another.

 

[dkhunt14]

It’s not a smart assed comment. It’s trying to keep a guy from making the mistake of planning a rifle around brass that has proven to be junk when compared to Lapua and is at the moment not even on the market with only the promise that it ever will be available. A 104 free bore has been used with the Norma brass because it allows you to stay out of the NSJ with the base of the bulket while still leaving you the full length of the neck to chase the lands.

I personally run a 115 free bore Henriksen reamer based off Lapua brass. It turned out perfect for me. On a fresh chamber, with a 103 Vaportrail it leaves the boat tail right at the spot that my Harrels die stop sizing the neck. It basically allows me to get 5-600 rounds on a barrel to be at the same point as a fresh 135 reamer of the same make that after 5-600 rounds I feel like I’m out of neck to continue to chase the lands.

The .155 freebore puts me about mid neck. I feel around 500 to 600 rounds and they are starting to lose their edge and need rechambered. At 1000 yards they start to show loss of accuracy. Matt

 

[LRPV]

So because he’s not falling the same path as you it’s wrong? How do you know the OP didn’t come across a couple hundred piece of brass and that’s why he’s gonna build it? Maybe instead of assuming or putting one down because of the question they asked, it’s be easier to just help and not change their mind.....course that would prolly make to much sense

Look buddy, I didn’t tell anyone they were wrong, yet. People come on here for two reasons. One is to ask for help/opinions of experienced shooters who may have already been down that road. The other reason seems to be people who have a touch of little mans disease and just assume that because someone tells it like it is that they are demeaning someone.

I guess we know which one you are.

And by the way, I’m one of the nicest guys you’ve never met and always willing to help.

 

[dkhunt14]

So because he’s not falling the same path as you it’s wrong? How do you know the OP didn’t come across a couple hundred piece of brass and that’s why he’s gonna build it? Maybe instead of assuming or putting one down because of the question they asked, it’s be easier to just help and not change their mind.....course that would prolly make to much sense

Only about one in 10 match shooters I talked to liked the Norma brass. The capacity is less and you can't get the velocity of the Lapua cases. The pockets go way faster in the Norma. In conditions at 600 and 1000 that can mean alot. The OP never mentioned his intended use. If he is doing it becuase he thinks he will get better barrel life, I believe he wont notice. I think it would of needed more like .125 longer to see any difference. I also didn't think Jasons response was bad. Just a response from experience of shooting thousands rounds of Dashers and knowing. Matt