30 br twist / heavy bullet ?

[Link]

Does someone make a different twist in the 30 br so as to shoot a heavier more aerodynamic bullet? If so how does it perform ?

thanks

 

[Baddog0302]

Most bbl. makers offer 30 Cal. in twists ranging from 1-8 th 1-16.
It is not the bullets weight that determines the required twist but it's length.

 

[M-61]

Does someone make a different twist in the 30 br so as to shoot a heavier more aerodynamic bullet? If so how does it perform ?

thanks

I have to answer with a question. What is your goal? I have two 30BR's. 1-17 and 1-18. One with a 19" barrel and the other 27".
Both are extremely accurate for my purposes with Berger 115gr bullets. That's why I ask what performance are you looking for, as I am strictly a 100-200 yard shooter.

 

[Link]

I have to answer with a question. What is your goal? I have two 30BR's. 1-17 and 1-18. One with a 19" barrel and the other 27".
Both are extremely accurate for my purposes with Berger 115gr bullets. That's why I ask what performance are you looking for, as I am strictly a 100-200 yard shooter.

I have a 18 twist and also shoot 115 Bergers and some Bibs. It works very well at 100 but not so good at 200 and 300. I know we have trouble reading the wind and have a very strange range, wind wise. It is time to rebarrel and looking for a better wind fighter. I would like to stay with the 30br but am considering a Dasher.
I have been thinking about this a long time lol

later Link

 

[riverwolf1]

The norm for a number of years was 15 twist, and a lot of guys were shooting 135 gr bullets. Most guys were shooting variations of the .308, like .30X46, 30X47, 30X48, 30HBR and a few others when the .30 BR came of age the move was to 112,115,& 118 bullets to help manage recoil, to some extent.

 

[riverwolf1]

Last year I shot a 30BR using a 15 twist and 125&135gr bullets, and did pretty well with it. During the winter I chambered a new 18 twist in 30BR, and yes 115 bullets at 300yds is tough.

 

[brcman]

125 grainers on a 1.ooo jacket will work just fine in a 17 inch twist barrel. I have done it .

 

[longbow]

If your under 600 yds, dont bother with a Dasher. The 6BR will do all you ask of it. save yourself the time and expense of fireforming, etc. An 8 twist 6BR is a dream gun . I do have a Dasher( I switch barrel), once I burn out the barrel that'll be it. The 6BR and 30BR are both great and simple.......

 

[BOBC]

Last year I shot a 30BR using a 15 twist and 125&135gr bullets, and did pretty well with it. During the winter I chambered a new 18 twist in 30BR, and yes 115 bullets at 300yds is tough.

A good match quality 125 or 135 gr bullet with a .150" BT length
(not a radius base some people call a BT) will tenderize that 300 yd toughness with not that much more recoil. And an 18 twist should be enough to stabilize that bullet.

 

[geo.ulrich]

A good match quality 125 or 135 gr bullet with a .150" BT length
(not a radius base some people call a BT) will tenderize that 300 yd toughness with not that much more recoil. And an 18 twist should be enough to stabilize that bullet.

Not so sure about that a quick calculation I'm coming up with 15.2 with a g.s. of 1.5 at 2900f.p.s.

 

[knguyen]

I have a 18 twist and also shoot 115 Bergers and some Bibs. It works very well at 100 but not so good at 200 and 300. I know we have trouble reading the wind and have a very strange range, wind wise. It is time to rebarrel and looking for a better wind fighter. I would like to stay with the 30br but am considering a Dasher.
I have been thinking about this a long time lol

later Link

Link : I have to disagree with previous member posting:
I have a 30 BR shooting : 112-115 gr bullets, both BIB 118 and my 115 gr I now make with a local shooter:
with the 30BR, it is a tack driver at 100 yards: awesome shooting:
at 200 yards: also shoot very good: but the load will change a lot going from 200 yard to 300 yards.
example: my standard load of 33.6 gr H4198 will shoot excellent at 100 ( I shoot my 30BR: varmint for score)
same load will also shoot lights out at 200 yards: (33.6 gr)
HOWEVER: going from 200 to 300 yard , it is a whole new ballgame: I have to load a completely different load to shoot well at 300 yards:
at 300 yards I am shooting between 34.3 up to 35.1 gr ,
I will go to the match preloaded for 300 yards with vials already powder loaded and shoot at sighters using the two higher loads, then I choose the one which gives me the least vertical, and go with that load: but on really hot days: I have tinker with load a bit at 300 yards.

30 BR will shoot really well at 100 to 300 yards, you have to just figure out your loads.
let me know if you need any help.
give your BR a chance.
khanh

 

[geo.ulrich]

Link : I have to disagree with previous member posting:
I have a 30 BR shooting : 112-115 gr bullets, both BIB 118 and my 115 gr I now make with a local shooter:
with the 30BR, it is a tack driver at 100 yards: awesome shooting:
at 200 yards: also shoot very good: but the load will change a lot going from 200 yard to 300 yards.
example: my standard load of 33.6 gr H4198 will shoot excellent at 100 ( I shoot my 30BR: varmint for score)
same load will also shoot lights out at 200 yards: (33.6 gr)
HOWEVER: going from 200 to 300 yard , it is a whole new ballgame: I have to load a completely different load to shoot well at 300 yards:
at 300 yards I am shooting between 34.3 up to 35.1 gr ,
I will go to the match preloaded for 300 yards with vials already powder loaded and shoot at sighters using the two higher loads, then I choose the one which gives me the least vertical, and go with that load: but on really hot days: I have tinker with load a bit at 300 yards.

30 BR will shoot really well at 100 to 300 yards, you have to just figure out your loads.
let me know if you need any help.
give your BR a chance.
khanh

lets see your shooting Randy's on a .925 as a f.b. for a 125 135 you will need a 1.00 jacket add another .015-.020 for b.t and .030 for point up and we get a bullet around 1.044-1.055 WITH a .150 long bt hate to tell you numbers are not adding up, 16 would be alright ..George

 

[BOBC]

Not so sure about that a quick calculation I'm coming up with 15.2 with a g.s. of 1.5 at 2900f.p.s.

When I shot NRA High Power I had a 308 Win. with 14 twist Hart barrel that stabilized 168's at 300 yds @ 2500 fps MV out of a 24" barrel. That's a lot more bullet than a 125 or 135. The only reason I changed it was it would not handle anything heavier than the 168. I made a few 135's for a friend of mine that shot an 18 twist 30 BR and he could not believe how well they grouped. Many times there is some wiggle room with calculations. The proof of the pudding is in the eating. If a shooter can't take a little more recoil, then shoot the real light bullets at the short range matches and take what the 300 yd stage gives you. I'll try to push as much bullet I can with the twist I have.
I believe a 15 twist 308 barrel over an 18 twist will give you a little more disruption at the bench than the slower 18. So try the heaviest bullet your twist and you can handle.

 

[geo.ulrich]

When I shot NRA High Power I had a 308 Win. with 14 twist Hart barrel that stabilized 168's at 300 yds @ 2500 fps MV out of a 24" barrel. That's a lot more bullet than a 125 or 135. The only reason I changed it was it would not handle anything heavier than the 168. I made a few 135's for a friend of mine that shot an 18 twist 30 BR and he could not believe how well they grouped. Many times there is some wiggle room with calculations. The proof of the pudding is in the eating. If a shooter can't take a little more recoil, then shoot the real light bullets at the short range matches and take what the 300 yd stage gives you. I'll try to push as much bullet I can with the twist I have.
I believe a 15 twist 308 barrel over an 18 twist will give you a little more disruption at the bench than the slower 18. So try the heaviest bullet your twist and you can handle.

agreed the least amount of twist the better and a 168 with a 1.15 jacket length will be stable in a 14 I am still with the math on 135's I have done a lot of experimenting with the 30 br with twists from 14 thru 24 fb and bt and about every ogive imaginable with the program I use for bullet design NOT jbm numbers do not add up one barrel or giving some to test in one barrel really would not be what I call a conclusive test ,,,,,George

 

[Laurie]

I'm having thoughts down the same line myself. I have an ex Target Rifle 7.62 Paramount (the 4-lug intermediate design in the Swing to RPA family). It has a well worn 1 in 14 'tight' Lothar Walther barrel that will go back to the days of GB TR shooting issue 146gn FMJBT milspec 7.62. I've scoped it up as a budget FTR rifle and with a front rest stabilizer for accurate short-range plinking off the bench. It's currently using up all my old shorter 167/168/170gn match bullets which is does very nicely with at ~2,600 fps despite a vast round-count and a lot of throat erosion.

I also have a new Bartlein 1 in 13 5R Palma profile 0.300/0.3080" blank that I was going to fit and make it a bit more competitive in FTR with 155s, probably sell it off cheap to a tyro. But then .... watching a friend's .30BR, a proper custom Light Varmint class BR rifle, I started to think of the Bartlein cropped to say 24-inches, light fixed power Weaver or Sightron BR scope, might just make Heavy varmint weight, and if throated for the original 155gn Sierra will also be a fun 300 yard FTR job.

It has the advantage of being dead cheap to build and run - I have everything I need for the rifle, access to a reamer, plenty of 6BR brass to re-form and doing a QuickLOAD propellant table run, I'd never have to buy an ounce of powder as I have a pound here, a pound there of all sorts of well matched grades that should work well. Cheap bullets, low recoil, and a barrel life that I'm certain would outlive me ... and you have the ultimate gentleman's plinker that will also allow a bit of match fun even if it has nil chance of being competitive in 100 yard BR. All I need to buy are dies and 135/155 Sierras.

 

[GeorgeSpringer]

I shoot the 135 SMK's in my 30BR and have shot the 155 palma bullets as well. I had a RPA quadlock in a Robertson stock that I had rebarreled with a 1.25 straight 1:10 Benchmark barrel and chambered it in 30R. My gunsmith had built quite a few 30BR's and told me I was crazy to use a fast twist barrel. That might be but the rifle/load shoots consistently in the .1/.2's with the best five shot group being .082 moa at 200 yds. The 155's did not shoot as well as the 135's, typically running about .5 moa at 200. Minimum recoil and extremely accurate, what more could one want?

 

[Laurie]

That's very encouraging George. Thanks for sharing your experience - I'll definitely give this a go.

 

[GeorgeSpringer]

My load is 35.5 grains of H322 with CCI450 primer and I am running a 32" barrel.

GS

 

[BOBC]

agreed the least amount of twist the better and a 168 with a 1.15 jacket length will be stable in a 14 I am still with the math on 135's I have done a lot of experimenting with the 30 br with twists from 14 thru 24 fb and bt and about every ogive imaginable with the program I use for bullet design NOT jbm numbers do not add up one barrel or giving some to test in one barrel really would not be what I call a conclusive test ,,,,,George

I use the #s as a guide and regardless who's barrel you use, the twist rate should be
the same if the barrel makers have accurate barrel making equipment.
Granted some barrels with the same twist rate will group and others won't. I've experienced this in my 32 years of NRA High Power Competition.

The test was conclusive for my friend's 30 BR bullet needs, he can use both bullet weights in his existing barrel.

I also gave some 135's to another 30 BR shooter with an 18 twist . He told me they shot real well, but he did not want the additional recoil he was getting with the 135 over his 118's. Both bullets were made in the same bullet die. The 135 had about .050" more bearing surface than the 118.

As far as twists, I believe the shooter should go with the recommended twist for the bullet they will be using the most. Then later should they find a different bullet they would like to try in their existing barrel, buy enough to test and go from there. If it works you've got a win win situation.

 

[Hammer47]

I know you want to stay 30 cal. however if you change your mind consider the 6PPC. Out to 300 it is unmatched in accuracy and there are no reloading secrets anymore. I generally do not exceed 200 yds. however on calm days I have had great results all the way to 600 yds.