Rifleing types 4 groove vs 5r

[Grizzle]

Ordering a 6mm barrel for a 6 prc build and having a hard time finding a consensus on 4 groove vs 5r rifleing since both options are available. Sounds like in theory the 5r has advantages? Any advice is appreciated.

 

[zrodwyo]

There definitely is no consensus. Highly likely that it does not matter.

 

[Ryan Avery]

Doesn't matter!!! but people will try to tell you it does.

 

[Hondo64d]

I don’t think it matters from an accuracy perspective, but Bartlein did tell me they thought the 5R is a little easier on bullet jackets, which could matter if your spinning the long high BC bullets fast enough to stabilize them.

John

 

[wind gypsy]

My understanding - 5r are a little bit easier on jackets. 4 groove is a little easier to chamber. Ive seen extremely anal accuracy smiths (alex wheeler, Mike @ TacOps, etc) indicate they go 4 groove if they had to pick one but either should be capable of shooting well. I pick 4 groove when I have a choice but that has been for less overbore cartridges. 5r might be nice for a 6 PRC if you're wanting to shoot ELDms.

 

[LaHunter]

I have a 22 Creed with a Krieger 26" 4 groove , 1:8 twist barrel. I only have 45 rounds down the barrel so far with 80 grain ELDMs from 3200 up to 3300 fps and they have shot very well. I have / had three other rifle barrels (.223 & 7 rem mag) from Krieger with their standard 4 groove barrels and all have been very accurate. I have never had any issues with my 4 groove barrels.

 

[Lawnboi]

4,5,6 no difference I have seen.

 

[Wrench]

I have 3, 4 and 5r right now in 6mm. I think 5r is a gimmick. I have been surprised by the 3 in that it is the fastest of the bunch by about 50-70fps.....the 5r is the slowest. The 3 was tighter than my smallest 6mm pilot.