6mm Bore Size Question...
- Thread starter 2dogs
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falconpilot
Gold $$ Contributor
Shot them both in my Dashers...One shoots as good as the other...some will tell you that the .237 should be used with lighter, short range benchrest bullets while the .236 is for heavier bullets...I've shot .237 till my current barrel which is a .236...I can't tell a difference in them...
Jim
Jim
rcw3
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My take on it:
If you have slightly undersize diameter bullets, a .236" may help.
For full diameter bullets or those with an oversize pressure ring .237" is fine.
I suspect many bench rest shooters relegate a barrel to the scrap heap long before most other shooters are just getting "warmed up" with a barrel so a .237" may be preferred as providing less bullet deformation and pressure with fast and/or spicy loads (like short range bench rest).
If you are running over the long term and plan on shooting a cartridge in the barrel 2000+ rounds, then a .236" may in fact help with barrel longevity and more meat to resist wear (i.e. that heat you feel on the outside of the barrel is not just heat from powder burning, it's the result of friction and wear every time a bullet goes down the bore). For high power and long range applications where longevity is desired we typically use nothing but .236's. We have noticed that some (not all by any means) of those .236" barrels do "shoot in" (and actually tighten up a little more) after a few hundred rounds.
I am sure there are other opinions on this but that's how I look at it.
I don't think it's a big issue either way and I would not ever declare a barrel not fit for use in an application just because it was .236" or .237". There are makers like Brux who only make .236" 6mm's, but they have made some great shooting barrels that have proven out in many shooting disciplines.
Robert
If you have slightly undersize diameter bullets, a .236" may help.
For full diameter bullets or those with an oversize pressure ring .237" is fine.
I suspect many bench rest shooters relegate a barrel to the scrap heap long before most other shooters are just getting "warmed up" with a barrel so a .237" may be preferred as providing less bullet deformation and pressure with fast and/or spicy loads (like short range bench rest).
If you are running over the long term and plan on shooting a cartridge in the barrel 2000+ rounds, then a .236" may in fact help with barrel longevity and more meat to resist wear (i.e. that heat you feel on the outside of the barrel is not just heat from powder burning, it's the result of friction and wear every time a bullet goes down the bore). For high power and long range applications where longevity is desired we typically use nothing but .236's. We have noticed that some (not all by any means) of those .236" barrels do "shoot in" (and actually tighten up a little more) after a few hundred rounds.
I am sure there are other opinions on this but that's how I look at it.
I don't think it's a big issue either way and I would not ever declare a barrel not fit for use in an application just because it was .236" or .237". There are makers like Brux who only make .236" 6mm's, but they have made some great shooting barrels that have proven out in many shooting disciplines.
Robert
falconpilot
Gold $$ Contributor
I have noted this about my current .236 versus my past .237...bare in mind this is in a Dasher...my old go to load with the .237 barrel's has always been 33.3-33.5 hrs of RL15 or Varget. These loads produced around 3030-3050 with a 105/108 Berger. On my new .236, the same pressures(based on case markings) and velocity's require 32.9-33.1grs....
Accuracy is the same, excellent with both barrel's...just a note....I shoot only Kreiger barrel
they are 1:8 twist..
Accuracy is the same, excellent with both barrel's...just a note....I shoot only Kreiger barrel
they are 1:8 twist..
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