7mm-284

[ERICK TUIN]

Is this a very common set up? looks like a good way to get the BC of the 7mm and the barrel life of a 284? 32" barrel and about 3000fps?

 

[burnt_servo]

Is this a very common set up? looks like a good way to get the BC of the 7mm and the barrel life of a 284? 32" barrel and about 3000fps?

how is a 7mm-284 different than a 284 Winchester ?

 

[.284]

Ummmmm?

 

[rifleman338]

I would lean to something chambered in 260Rem Erick. Barrel life will be much better and components much easier to find.

 

[ERICK TUIN]

here is the article I was reading that made me ask the question.

The chamber was cut with a reamer made for Lapua 6.5-284 brass necked up to 7mm. It's throated for the 180gr Bergers. I selected a Broughton 5C because, as my gunsmith says, "They just shoot". This is a 1:9" twist, 1.250" straight contour for 32". Yes, that's a long, heavy barrel, but I think the length gives me a velocity advantage.

http://www.6mmbr.com/gunweek088.html

 

[kombayotch]

6.5-284 is a a 284 Winchester necked down to 6.5mm. 0.284 is 7mm, so you are just turning the 6.5-284 back into straight 284 winchester

 

[Andy]

So much for my 6mm-243 Wildcat idea.......

 

[coyote]

284 is an awesome round and has good barrel life a lot of 284's in f-open and they win to , I built a medium weight barreled one last summer as a hunting rifle and am considering doing f-class gun on one.

 

[ERICK TUIN]

I guess that is what I was wondering. It looks like the 7mm rounds have very good BC numbers. The 7mm rem mag is pretty hot with not great barrel life. So pushing them to 3000fps out of a .284 long barrel should get better life. I was curious how common they are. Looking for .284win brass it doesn't seem to be all that common. The solution in the article was 6.5-284 brass necked up to 7mm. I was also curious if this was a common practice.

 

[K0na_stinky]

So much for my 6mm-243 Wildcat idea.......

It would be really easy to make brass for.

 

[burnt_servo]

I guess that is what I was wondering. It looks like the 7mm rounds have very good BC numbers. The 7mm rem mag is pretty hot with not great barrel life. So pushing them to 3000fps out of a .284 long barrel should get better life. I was curious how common they are. Looking for .284win brass it doesn't seem to be all that common. The solution in the article was 6.5-284 brass necked up to 7mm. I was also curious if this was a common practice.

f you can't get the proper sized brass then the next step is to look at cartridges that use the same parent case ( just different calibers ) and then resize the cases to what you need .......

with some people it is as common as breathing . with others , they can't seem to get their heads wrapped around it , and it is like trying to move a mountain with a plastic toy shovel for them .

just take the 6.5 brass , lube them up and run them through a 284 die .... and you are done .

 

[MikeTheRock]

The reason they were necking up 6.5-284 brass is because they wanted Lapua brass. Winchester brass is/was available in .284 so you could avoid messing around, but Lapua is considered by some to be better brass.

The most important thing to remember is to tell your smith if you are necking up 6.5-284 or using Winchester brass. The reamers are very slightly different and they need to select the correct one for your build.