ABR Posted July 26, 2016 Report Share Posted July 26, 2016 So decided on rebarreling a T3 doner action I have in 6.5-284 and shooting 130-140 VLD's out to a 1000 but started running data on 6mm-284 with 105's, they're impressive!! Apart from there being a bit more brass prep and a even more reduced barrel life with the 6mm is there any other pro's and con's of the two? Have heard it mentioned that the 6mm can be a bit fussy to get a good load developed for it??...... Link to comment Share on other sites More sharing options...
The Gun Pimp Posted July 26, 2016 Report Share Posted July 26, 2016 Had a few 6-284s. Brilliant 1000 yard BR round but barrel-life is short - very short! Not too fussy on load-development. Despite its performance in competition, I'll not build another. Link to comment Share on other sites More sharing options...
weejohn Posted July 26, 2016 Report Share Posted July 26, 2016 I had the same decision to make , ended up with 7mm-284 . Decided I would regret the barrel life. Link to comment Share on other sites More sharing options...
andybrock Posted July 26, 2016 Report Share Posted July 26, 2016 Had a few 6-284s. Brilliant 1000 yard BR round but barrel-life is short - very short! Not too fussy on load-development. Despite its performance in competition, I'll not build another. How short Vince? Link to comment Share on other sites More sharing options...
The Gun Pimp Posted July 26, 2016 Report Share Posted July 26, 2016 Well, in 1000 yard benchrest competition, you are firing 5 rounds in around 15 seconds. That's hard on barrels - 400 to 450 rounds if you want to maintain half MOA accuracy out to 1000 yards. Link to comment Share on other sites More sharing options...
andybrock Posted July 27, 2016 Report Share Posted July 27, 2016 Well, in 1000 yard benchrest competition, you are firing 5 rounds in around 15 seconds. That's hard on barrels - 400 to 450 rounds if you want to maintain half MOA accuracy out to 1000 yards. That is short! But if you for instance were using it for fox with maybe one or two shots a night would barrel life significantly increase? Would it achieve 1500 rounds or is that too optimistic? Sorry ABR for hijacking your post. Link to comment Share on other sites More sharing options...
gbal Posted July 27, 2016 Report Share Posted July 27, 2016 Andy,yes-foxing barrel would last longer. Many variables,but calibre,presure and heat (powder and amount) AND rate of fire are the main ones. cf "typical' acceptable life: 308 5000 260 2500 243 1800 All very approx,but indicates in essentialy the same case,the effects of 'overboring'-hot in smaller bore. Would you get 1500 fro 6/284-just maybe,it's gor more powder than 243.....but cold barrel each time....? Accuracy Tech has a good readable article -"Barrel life" Accurate Shooter has too,with the Excell spreadsheet calculator "Barrel Life Spreadsheeet" As Vince says,a lot depends on useage rate-a machine gun used heavily will wear barrels a lot more than a single shot a year hunter! But note too,what does 'toast/shot out' mean: for a competition shoooter deterioration from 1/4 to 1/2 moa might be unacceptable,but a hunter shooting at 150 yards might not even notice,and might well be ok with one moa,even more-many new rifles are not that good! This is quite a big consideration-potentially increasing barrel life a lot (depending on how fussy you are about first shot hit probability/group size-and probably accounts for the considerable differences casually reported by users of the 'same' cartridge). Barrel life times in actual ' bullet in the barrel" are short- maybe 10 seconds for 5000 308w,more like 3 seconds for 1500 243) !! gbal Link to comment Share on other sites More sharing options...
ABR Posted July 27, 2016 Author Report Share Posted July 27, 2016 Sorry ABR for hijacking your post. It's cool man, all good info for me also!! I'd say that your barrel life would double, maybe even 1000+ only firing single shots at foxes. It's the temperature that erodes the throat firing rapid or long strings. For vermin and targets out to 1000y it really does look like it trumps the 6.5, just a shame about barrel life. Link to comment Share on other sites More sharing options...
The Gun Pimp Posted July 27, 2016 Report Share Posted July 27, 2016 Just firing the odd round - where the barrel never gets hot - would probably give you up to 1000 rounds. Link to comment Share on other sites More sharing options...
17 squirrel Posted July 27, 2016 Report Share Posted July 27, 2016 I have a 6-284 it has a 1:14 twist, and i have had it since 2004. I use a 68g match bullet in it and only use it for foxing. The most shots i ever fire at a paper target would be 10. The first barrel had a round count of 950, can't remember how long that was in time. I didn't find the accuracy fell off, but i started getting pressure signs, which was due to what the gunsmith described as severe fire cracking. I think the rebarrel cost £450 i think which i didnt think was to bad for the enjoyment i got out of it. The round count on this barrel is now just under 800, and on a good day (for me that is) is sub 1/2 min all day. Link to comment Share on other sites More sharing options...
6.5 shooter Posted July 27, 2016 Report Share Posted July 27, 2016 I have a 6-284 it has a 1:14 twist, and i have had it since 2004. I use a 68g match bullet in it and only use it for foxing. The most shots i ever fire at a paper target would be 10. The first barrel had a round count of 950, can't remember how long that was in time. I didn't find the accuracy fell off, but i started getting pressure signs, which was due to what the gunsmith described as severe fire cracking. I think the rebarrel cost £450 i think which i didnt think was to bad for the enjoyment i got out of it. The round count on this barrel is now just under 800, and on a good day (for me that is) is sub 1/2 min all day. What sort of speed you getting with that bad boy? Link to comment Share on other sites More sharing options...
SteveW Posted July 27, 2016 Report Share Posted July 27, 2016 What sort of speed you getting with that bad boy? I had an identically built rifle to 17 Squirrel's, 26" 1:14 and was getting 4000 fps with 68g Barts, but could push this to 4150fps with less accuracy this was with N160. It was rebarrelled after approx 750 rounds with no drop off in accuracy, I just fancied a change, it was rebarrelled with 27" 1:10 and was shooting 87g Bergers and 87g Vmaxes at almost 3600 fps with N560 and no pressure signs, it has just had chop to 24" and not had a chance yet to check loads. Only used for fox and very slow shot string load development, HTH I remember Vince telling us about his previously and from memory it was a slightly shortened version, did I recall that correctly Vince? Link to comment Share on other sites More sharing options...
andybrock Posted July 27, 2016 Report Share Posted July 27, 2016 Thanks for the replies chaps, I'm liking the sound of this Link to comment Share on other sites More sharing options...
17 squirrel Posted July 27, 2016 Report Share Posted July 27, 2016 I use vit 160, 58g with barts 68g flat base gave 3975 fps, i also roll my own 68g flat base match bullets, these with the same loading give 4040 fps. Link to comment Share on other sites More sharing options...
The Gun Pimp Posted July 28, 2016 Report Share Posted July 28, 2016 I had an identically built rifle to 17 Squirrel's, 26" 1:14 and was getting 4000 fps with 68g Barts, but could push this to 4150fps with less accuracy this was with N160. It was rebarrelled after approx 750 rounds with no drop off in accuracy, I just fancied a change, it was rebarrelled with 27" 1:10 and was shooting 87g Bergers and 87g Vmaxes at almost 3600 fps with N560 and no pressure signs, it has just had chop to 24" and not had a chance yet to check loads. Only used for fox and very slow shot string load development, HTH I remember Vince telling us about his previously and from memory it was a slightly shortened version, did I recall that correctly Vince? Yeh - I did a shortened version in the hope of getting a better case-fill. I did - but it wasn't worth the extra trouble of case-forming. Link to comment Share on other sites More sharing options...
ABR Posted July 29, 2016 Author Report Share Posted July 29, 2016 Had a few 6-284s. Brilliant 1000 yard BR round but barrel-life is short - very short! Not too fussy on load-development. Hey Gun Pimp, Were you shooting 105's and 115's in yours, if so what kinda velocities are achievable? Link to comment Share on other sites More sharing options...
The Gun Pimp Posted July 29, 2016 Report Share Posted July 29, 2016 Hey Gun Pimp, Were you shooting 105's and 115's in yours, if so what kinda velocities are achievable? I tried the 115 DTAC and Berger but it always worked best with 107gn Sierras. These have a thicker jacket than most 105s. You can drive 'em at 3400+ but then I used to get messages back from the butts "Nice group but only four shots!" Run 'em too fast and they'll blow! I used to stick around 3250fps. You can get almost equal performance with a 243 Ack. but the barrel doesn't last any longer and it doesn't quite have the consistency of the 6-284. Link to comment Share on other sites More sharing options...
ABR Posted July 29, 2016 Author Report Share Posted July 29, 2016 I tried the 115 DTAC and Berger but it always worked best with 107gn Sierras. These have a thicker jacket than most 105s. You can drive 'em at 3400+ but then I used to get messages back from the butts "Nice group but only four shots!" Run 'em too fast and they'll blow! I used to stick around 3250fps. You can get almost equal performance with a 243 Ack. but the barrel doesn't last any longer and it doesn't quite have the consistency of the 6-284. Thanks for your help, much appreciated!! ;-) Link to comment Share on other sites More sharing options...
JTO Posted September 17, 2016 Report Share Posted September 17, 2016 I've been told that a 6.5-284 could need a new barrel after 800 rounds. The barrel could be worn out by the time you have worked up a load from scratch, That's why people are going for .284W instead. Link to comment Share on other sites More sharing options...
OSOK Posted October 29, 2016 Report Share Posted October 29, 2016 Just my thoughts , I have a 6 x 284 , 6.5 x 284 , 6.5 wsm & 7/270 wsm's and nothing beats the 7mm's . Vince is right regarding the heat created by either fast firing of five shots or quickish firing of 2 & 15's or 2 & 20's in comps but half a dozen rounds over an afternoon is worlds apart in barrel wear . My finding on the 6 x 284 were in calm conditions it shot like a dream but on reflection most good rounds would like BR's , Dasher's , 47's etc , But the moment the wind picked up you wished you'd brought a 7 . If i wanted one rifle to fit all out of the above and i wasn't going out too far then i'd run the 6.5 x 284 over the 6 x 284 but running a 7mm slowly would still beat them both with ease . OSOK Link to comment Share on other sites More sharing options...
gbal Posted October 29, 2016 Report Share Posted October 29, 2016 Just my thoughts , I have a 6 x 284 , 6.5 x 284 , 6.5 wsm & 7/270 wsm's and nothing beats the 7mm's . Vince is right regarding the heat created by either fast firing of five shots or quickish firing of 2 & 15's or 2 & 20's in comps but half a dozen rounds over an afternoon is worlds apart in barrel wear . My finding on the 6 x 284 were in calm conditions it shot like a dream but on reflection most good rounds would like BR's , Dasher's , 47's etc , But the moment the wind picked up you wished you'd brought a 7 . If i wanted one rifle to fit all out of the above and i wasn't going out too far then i'd run the 6.5 x 284 over the 6 x 284 but running a 7mm slowly would still beat them both with ease . OSOK "The good Lord giveth......." I'm reminded of a variant on Einstein's uber question: "when god the made the laws of ballistics ,and the 7mm proved superior,was there any real choice?" gbal Link to comment Share on other sites More sharing options...
OSOK Posted October 29, 2016 Report Share Posted October 29, 2016 Yes I'm guessing that's a decent size variant ...... Not sure what he would have made of someone like me as i think he said ' A clever man solves a problem , A wise man avoids it to start with ' I sometimes seem to create a problem so i can solve it were shooting is concerned OSOK Link to comment Share on other sites More sharing options...
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