jetdriver71 Posted November 5, 2011 Share Posted November 5, 2011 I've got 2 SVI limited sighttracker guns. One with the AET barrel which is 1/32 twist I think and the other is their standard 1/16 twist. Soooo whats the difference as far as shooting is concerned. Can someone explain "standard" vs. a Gain twist barrel. Any advantages? Basically looking for an explanation how a barrel is made etc.... Thanks!!! Link to comment Share on other sites More sharing options...
Aircooled6racer Posted November 5, 2011 Share Posted November 5, 2011 Hello: You can do some reading about the barrels on the Schuemann barrel wesite. Wil Schuemann setup SVI to do there own barrels. Very interesting reading. The AET should be 1/24 gain twist. Take a look there. Hope this helps. Thanks, Eric Link to comment Share on other sites More sharing options...
BlueOvalBruin Posted November 6, 2011 Share Posted November 6, 2011 Hello: You can do some reading about the barrels on the Schuemann barrel wesite. Wil Schuemann setup SVI to do there own barrels. Very interesting reading. The AET should be 1/24 gain twist. Take a look there. Hope this helps. Thanks, Eric +1 Link to comment Share on other sites More sharing options...
jetdriver71 Posted November 6, 2011 Author Share Posted November 6, 2011 type error on the twist rate...thanks Ill chk it out.. Link to comment Share on other sites More sharing options...
CMV Posted November 6, 2011 Share Posted November 6, 2011 I believe in a "gain twist" rifled barrel, the twist rate increases as it progresses from the breech to the bore. Link to comment Share on other sites More sharing options...
RippSpeed Posted November 6, 2011 Share Posted November 6, 2011 I always thought that when its a 24" inch twist rate ... The bullet turns once ever 24" inches of travel... Or is my knowledge is flawed ??? Link to comment Share on other sites More sharing options...
392heminut Posted November 7, 2011 Share Posted November 7, 2011 I always thought that when its a 24" inch twist rate ... The bullet turns once ever 24" inches of travel... That's correct. Link to comment Share on other sites More sharing options...
Singlestack Posted November 7, 2011 Share Posted November 7, 2011 I always thought that when its a 24" inch twist rate ... The bullet turns once ever 24" inches of travel... Or is my knowledge is flawed ??? In a gain twist barrel, it depends where in the barrel the bullet is. Just down stream of the chamber, the rifling is straight. At the muzzle, 1/24 . Link to comment Share on other sites More sharing options...
jetdriver71 Posted November 7, 2011 Author Share Posted November 7, 2011 Thanks for the replies. I checked on Schummann Barrel's website and it had a lot of info on barrels, gain twist, etc... thanks again yall!!! Link to comment Share on other sites More sharing options...
jetdriver71 Posted November 7, 2011 Author Share Posted November 7, 2011 Schummann says that there is some advantage in accuracy with a gain twist barrel. Like I said lots of info on the subject on their website. check it out if you're curious RippSpeed. I think you have to be a physisist (spelling?) to understand it all tho. Link to comment Share on other sites More sharing options...
Aircooled6racer Posted November 7, 2011 Share Posted November 7, 2011 Hello: Wil Schuemann was a rocket scientist after all He was a great guy to talk to on the phone. I heard he is spending more time with his grandkids and Mike runs the shop. Thanks, Eric Link to comment Share on other sites More sharing options...
BlueVFRank Posted November 7, 2011 Share Posted November 7, 2011 I wonder when SVI will come with more info regarding their new barrel design. The text on the frontpage hasn't changed the last couple of weeks. Infinity News NEW FROM INFINITY: New barrel design with improved strength in the rib and a new rifling scheme with a significant gain in accuracy!!! More details soon. Guess the "more details soon" is in SVI time which is considerably longer than GMT. But so worth the wait. I want my sight tracker for Christmas! Link to comment Share on other sites More sharing options...
BlueVFRank Posted December 27, 2011 Share Posted December 27, 2011 Since the topic I started got locked down I'll bump this one. Has anyone got any info on the new barrels? It's been so long that the news regarding the new barrels dropped from the news page but the details never where given. DVC Frank (still waiting for my SVI unfortunately still waiting, X-mas 2012?? ) Link to comment Share on other sites More sharing options...
mumford Posted April 16, 2012 Share Posted April 16, 2012 bump. Any news on the new SVI barrel design? Link to comment Share on other sites More sharing options...
Too_Slow Posted April 16, 2012 Share Posted April 16, 2012 I don't know about the changes to the rifling but the change to the rib was to add a radius where the rib meets the barrel because they were having too many barrels breaking at that point. Brian Link to comment Share on other sites More sharing options...
EngineerEli Posted April 17, 2012 Share Posted April 17, 2012 If anyone is still trying to get a better idea of the 'Gain Twist Rifling' I took a pretty cool picture that shows the rifling in my barrel. I can post it tonight when I get home if anyone wants. I don't know about the changes to the rifling but the change to the rib was to add a radius where the rib meets the barrel because they were having too many barrels breaking at that point. Brian Brian, Is this radius around the whole rib? I'll have to check my hybrid barrel when I get home to see if it has the radius. Is the alternative, just a sharp 90* edge between what would be the normal barrel and the rib? -Eli Link to comment Share on other sites More sharing options...
Vincent C Posted April 17, 2012 Share Posted April 17, 2012 If anyone is still trying to get a better idea of the 'Gain Twist Rifling' I took a pretty cool picture that shows the rifling in my barrel. I can post it tonight when I get home if anyone wants. I don't know about the changes to the rifling but the change to the rib was to add a radius where the rib meets the barrel because they were having too many barrels breaking at that point. Brian Brian, Is this radius around the whole rib? I'll have to check my hybrid barrel when I get home to see if it has the radius. Is the alternative, just a sharp 90* edge between what would be the normal barrel and the rib? -Eli The non radiused barrels have pretty much a 90 deg edge between the rib and the barrel and the back of the rib(the part that sits up against the slide) has a round profile. The radiused barrels have an obvious radius around them and have a more squared off profile on the back of the rib. There is a close up picture of one of the radiused ones here:http://www.brianenos.com/forums/index.php?showtopic=133632&st=0 Link to comment Share on other sites More sharing options...
EngineerEli Posted April 17, 2012 Share Posted April 17, 2012 The non radiused barrels have pretty much a 90 deg edge between the rib and the barrel and the back of the rib(the part that sits up against the slide) has a round profile. The radiused barrels have an obvious radius around them and have a more squared off profile on the back of the rib. There is a close up picture of one of the radiused ones here:http://www.brianenos...pic=133632&st=0 Thanks for the link, I guess I have the last generation SV barrel, I hope I dont have any problems with it shooting major 180gr with TG...... So far (~250 rds) it has been exemplary! Link to comment Share on other sites More sharing options...
EngineerEli Posted April 18, 2012 Share Posted April 18, 2012 I though this was a pretty cool picture to see the gain twist rifling. -Eli Link to comment Share on other sites More sharing options...
Vincent C Posted April 19, 2012 Share Posted April 19, 2012 The non radiused barrels have pretty much a 90 deg edge between the rib and the barrel and the back of the rib(the part that sits up against the slide) has a round profile. The radiused barrels have an obvious radius around them and have a more squared off profile on the back of the rib. There is a close up picture of one of the radiused ones here:http://www.brianenos...pic=133632&st=0 Thanks for the link, I guess I have the last generation SV barrel, I hope I dont have any problems with it shooting major 180gr with TG...... So far (~250 rds) it has been exemplary! My understanding is that the problem mostley came up in open guns when ever there were any. I have seen a barrel or two just like yours with around 100k rounds through them and they were still going. Link to comment Share on other sites More sharing options...
EngineerEli Posted April 19, 2012 Share Posted April 19, 2012 My understanding is that the problem mostley came up in open guns when ever there were any. I have seen a barrel or two just like yours with around 100k rounds through them and they were still going. I'm very glad to hear that clarification, thanks! I'm shooting major .40 for limited, so it should be fine. Link to comment Share on other sites More sharing options...
Julien Boit Posted April 20, 2012 Share Posted April 20, 2012 If Brandon allows me, I'll post some pics of some groups shot with the new AET barrels. The accuracy is just incredible. Link to comment Share on other sites More sharing options...
Julien Boit Posted April 20, 2012 Share Posted April 20, 2012 Here it is : These are groups shot with the barrel only attached to a proprietary fixture to test accuracy. Link to comment Share on other sites More sharing options...
XRe Posted April 20, 2012 Share Posted April 20, 2012 The accuracy is just incredible. For certain, that's solid accuracy - it looks like the groups were measured "outside to outside", though - a bullet diameter should be subtracted to get the usual group size. However, FWIW - I wouldn't label that incredible. I've shot similar or better groups using an assembled gun shot from a rest (in a gun with an STI TruBor barrel, no less - a barrel that "word on the street" would have you believe can't hit the broad side of a barn). For instance, the group here: http://re-gun.com/2011/11/for-sale-brazos-custom-gunworks-pro-sx/ - was shot w/ Zero 125gr bullets at 50 yards, and measured just under an inch center-to-center. That's a full build, no test fixture. Link to comment Share on other sites More sharing options...
DrawandDuck Posted April 20, 2012 Share Posted April 20, 2012 Looks pretty damn tight to me.....at 50 yds with a c-more you are aiming at a area (offhand) and then it is more on the shooter than the barrel. Link to comment Share on other sites More sharing options...
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