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View Full Version : 30x47 to 30 br



johan teughels
06-21-2015, 02:09 AM
i like my barrel to be changed from 30x47 to 30 br how mutch do i need to cut to rechamber ?

mwezell
06-21-2015, 12:49 PM
i like my barrel to be changed from 30x47 to 30 br how mutch do i need to cut to rechamber ?
Depends on which has the larger neck od, for one thing. In most cases, that will be the 30x47, so you'll want to remove at least enough to clean up all of the neck and freebore. In a perfect world, where there were no other considerations besides case OAL, it would be about .375". IMHO, I think it best to at least cut the threaded tenon length off and re-thread and chamber. Of course that length would be different for different actions.

If you want a more precise number, more info is needed to know exactly how much it'll take to clean up the existing neck and throat...and its wear.

virg
06-21-2015, 01:08 PM
i like my barrel to be changed from 30x47 to 30 br how mutch do i need to cut to rechamber ?

Has anyone done a real experiment that proves the 30BR is more accurate than a 30x47? My 30x47 HBR barrel in an indoor range will put five in the zero's when it was new. That's better than I can shoot in match conditions.

Just wondering...

virg

mwezell
06-21-2015, 02:29 PM
Has anyone done a real experiment that proves the 30BR is more accurate than a 30x47? My 30x47 HBR barrel in an indoor range will put five in the zero's when it was new. That's better than I can shoot in match conditions.

Just wondering...

virg
Bring it to a short range score match. That's a very good test.

David Halblom
06-21-2015, 03:01 PM
i like my barrel to be changed from 30x47 to 30 br how mutch do i need to cut to rechamber ?

Way to make that conversion would be to cutoff the shank and start anew. otherwise, you are trying to pick up the old threads and also potentially dealing with the BR reamer not fully cleaning up the old chamber. Unless you already have a very short barrel, whack the stub off and start new.

jackie schmidt
06-21-2015, 11:09 PM
Way to make that conversion would be to cutoff the shank and start anew. otherwise, you are trying to pick up the old threads and also potentially dealing with the BR reamer not fully cleaning up the old chamber. Unless you already have a very short barrel, whack the stub off and start new.

Good advice.

Steelhead1
06-22-2015, 12:44 AM
I did two last year before the Nationals at Casper, Wy, and thats exactly what I did cut off and start over!

R.G. Robinett
06-22-2015, 12:25 PM
http://benchrest.com/images/misc/quote_icon.png Originally Posted by virg http://benchrest.com/images/buttons/viewpost-right.png (http://benchrest.com/showthread.php?p=759036#post759036)
Has anyone done a real experiment that proves the 30BR is more accurate than a 30x47? My 30x47 HBR barrel in an indoor range will put five in the zero's when it was new. That's better than I can shoot in match conditions.
Just wondering...

virg

Bring it to a short range score match. That's a very good test.

I believe that Virg, " has been there, done that, and got the T-shirts!" ;)
Here's an empirical result, polluted by varying abilities: in conjunction with the 2013 NBRSA Hunter Nationals, Mill Creek, De Soto, KS, Ron Shultz also conducted the NBRSA Mid-Continent VfS Regional, Greg Swezey, using a 30x47 chambered HV rifle, posted a convincing win over the 30BRs, PPCs, etc. Ringing-out a quantifiable difference would require many barrels and a LOT of shootin'! :o RG

mwezell
06-22-2015, 01:36 PM
http://benchrest.com/images/misc/quote_icon.png Originally Posted by virg http://benchrest.com/images/buttons/viewpost-right.png (http://benchrest.com/showthread.php?p=759036#post759036)
Has anyone done a real experiment that proves the 30BR is more accurate than a 30x47? My 30x47 HBR barrel in an indoor range will put five in the zero's when it was new. That's better than I can shoot in match conditions.
Just wondering...

virg

Bring it to a short range score match. That's a very good test.

I believe that Virg, " has been there, done that, and got the T-shirts!" ;)
Here's an empirical result, polluted by varying abilities: inn conjunction with the 2013 NBRSA Hunter Nationals, Mill Creek, De Soto, KS, Ron Shultz also conducted the NBRSA Mid-Continent VfS Regional, Greg Swezey, using a 30x47 chambered HV rifle, posted a convincing win over the 30BRs, PPCs, etc. Ringing-out a quantifiable difference would require many barrels and a LOT of shootin'! :o RG
Impressive! If there ever was anyone that has long believed that there are viable cartridges other than the BR and PPC, it would be me.
While there are some that disagree with me about it, I've always felt like h4198 is a tad slow in the 30BR. Adding a little more room seems logical that it could well be a good thing, if using that powder..or maybe even another like IMR4198 that's bulkier.

As an aside, I've always been awed by you guys that shoot a 10lb, 6x 30x47 in hunter. Of late, I've been shooting a 220 Beggs a lot. I feel it is as accurate as anything and a joy to shoot in a 13.5lb rifle....Completely different than the 30's.

Have a good day Randy!--M

mike in co
06-22-2015, 01:58 PM
mike...
per lou,
try lt30 in a 30 br....


Impressive! If there ever was anyone that has long believed that there are viable cartridges other than the BR and PPC, it would be me.
While there are some that disagree with me about it, I've always felt like h4198 is a tad slow in the 30BR. Adding a little more room seems logical that it could well be a good thing, if using that powder..or maybe even another like IMR4198 that's bulkier.

As an aside, I've always been awed by you guys that shoot a 10lb, 6x 30x47 in hunter. Of late, I've been shooting a 220 Beggs a lot. I feel it is as accurate as anything and a joy to shoot in a 13.5lb rifle....Completely different than the 30's.

Have a good day Randy!--M

mwezell
06-22-2015, 02:52 PM
mike...
per lou,
try lt30 in a 30 br....

Thanks Mike! Actually, I'm more interested in seeing how it does in my 30 Major. LT32 will shoot but is a slow pour and a very full case. If the lt30 is only a little bit faster, I think it'll be very good in it. My problem of late, has been time to shoot ANYTHING...much less time to test.
I've enjoyed shooting the 220 Beggs but am thinking about screwing on a 30 barrel and going back to it for a while. They're just so easy to make shoot and stay tuned.

johan teughels
06-22-2015, 02:56 PM
i can not get used to the 30x47 recoil especialy just after 4 day match of 6ppc use
barrel has about 300 shots so not realy wear .treats in the barrel are cut without a grouve so i can chase them en continue cutting them .reamers bought got .330 neks and same front configuration (robinett 30x47 and robinett 30 br reamers)

virg
06-22-2015, 03:37 PM
http://benchrest.com/images/misc/quote_icon.png Originally Posted by virg http://benchrest.com/images/buttons/viewpost-right.png (http://benchrest.com/showthread.php?p=759036#post759036)
Has anyone done a real experiment that proves the 30BR is more accurate than a 30x47? My 30x47 HBR barrel in an indoor range will put five in the zero's when it was new. That's better than I can shoot in match conditions.
Just wondering...

virg

Bring it to a short range score match. That's a very good test.

I believe that Virg, " has been there, done that, and got the T-shirts!" ;)
Here's an empirical result, polluted by varying abilities: inn conjunction with the 2013 NBRSA Hunter Nationals, Mill Creek, De Soto, KS, Ron Shultz also conducted the NBRSA Mid-Continent VfS Regional, Greg Swezey, using a 30x47 chambered HV rifle, posted a convincing win over the 30BRs, PPCs, etc. Ringing-out a quantifiable difference would require many barrels and a LOT of shootin'! :o RG

It seems given the 30BR, 30PPC, and 30x47 and equal equipment and reloading talent; the shooter reading the condition best wins the day in any match. By the way, Randy seems pretty good at that. Mind that Charlie Fajkus won the Hunter nationals at Raton with his 30x48. I think it was 2006. Hell, some of the North West coast guys were shooting 250 and X's in the teens with full blown 308's.
But...I'll admit, the 30BR with it's long brass and barrel life coupled with a slight recoil reduction probably will remain the preferred caliber.

Virg

R.G. Robinett
06-22-2015, 11:34 PM
It seems given the 30BR, 30PPC, and 30x47 and equal equipment and reloading talent; the shooter reading the condition best wins the day in any match. By the way, Randy seems pretty good at that. Mind that Charlie Fajkus won the Hunter nationals at Raton with his 30x48. I think it was 2006. Hell, some of the North West coast guys were shooting 250 and X's in the teens with full blown 308's.
But...I'll admit, the 30BR with it's long brass and barrel life coupled with a slight recoil reduction probably will remain the preferred caliber.

Virg

Well summarized, Virg. :cool:

In this capacity range, I believe there is more difference from barrel-to-barrel than between cartridges. And, as Mike E. pointed out, as capacity increases, there are a LOT more powder options. I always fall-back on the info presented by John Bunch, via Precision Shooting, WAY back in the mid 1980s, regrading thirty caliber cartridges: as capacity increases, precision is achieved/maintained via increased bullet weight, & vice versa.
This advice, presented by Mr. Bunch, following his extensive testing, has proven quite sound. :) RG

Greg Walley
06-23-2015, 09:51 AM
One of the most incredibly accurate rifles Iíve ever shot was a Hunter Class, Hart barreled 30x47 HBR using BIB bullets. Unfortunately the guy that owned the rifle died several years ago, and I donít remember what twist barrel (probably a 1-15Ē, but Iím not sure) I put on the rifle for him, or the bullet weight/powder/load used.

Greg Walley
Kelbly's Inc.

mike in co
06-23-2015, 11:54 AM
my full size 308 br with a turned neck is a 1/15 shooting 125's and bid 134's