3150 fps w/115 gr???

[M700]

How does a fellow take a .243 Win to 3150 fps with a 115?

That's what George's load is reported to develop - making it look mighty good for long-range prone matches...

So: How much barrel length? Any special considerations for chamber? Best twist for the 115 at high velocity?

What brass? There's a lot of different choices for the .243 Win.

I see George's load w/RE-25 and 115 gr moly coated. But I need a little more info before I take the plunge... I'm thinking that re-barreling one of my .308's could result in a wicked varmint rifle/F-class long-range rig.

Thanks, Guy

 

[roninboise]

I use Dtac 115gr. moly-coated bullets in an 8 twist 30" Lilja barrel. I am using a case that is a shortened 284 case. The shoulder is pushed back .080" more than a standard 6mm/284 The neck stays long to the original 6/284 dim. I think this case has a similar capacity to a 243.
I use 54gr. of H1000 with the bullet just off the lands. I tested this load on paper last Friday and it did 3300fps with an extreme spread of 6 and a standard deviation of 2. It knocked them in a hole. I then went out to one of my favorite rock chuck spots and this round did awesome at 350 yards. I expect will will perform to 1K.

Ron in Boise
ronhbr@cableone.net

 

[joesr]

Guy,

I believe George's load information. Using moly coated bullets in the 243 I am sure that 3100 or more is possible.

You do need at least a 28" barrel. I shoot similar loads in my 6CM and there is a 200 FPS difference from the 26" to the 28" barrels I have, with the same load.

Also, using H1000 or N165 we have been able to get 3050 fps from a 26" barrel with uncoated bullets.

Joe H

 

[sewwhat89]

Keep in mind they are using slow burn-rate powders, RL 25 and H1000, which will benefit from the longer tubes, much more so than say H4350 and H4831sc. I am pretty sure it has been pointed out that using H4350 with the 107 + gr bullets is a good way to burn out a barrel in 1200 rounds.

 

[1shot]

Hi all,
I'm just getting back into the game after a extended time away. I'm currently waiting on my 1-8 twist Broughton 5-c barrel 28 1/2" to arrive. Gonna chamber it in 6XC and shoot 105 Lapuas above H-4350 or Varget. Now you are telling me that after 1200 rds. by bbl. is scrap?? Tim North from Broughton says that the 115 gr. bullets arn't setting the world on fire. Can anyone confirm of deny these claims?
Thanks,
1shot

 

[rhino]

YMMV. Guy shooting a 6-250 out of a 28 True Flit in his Tikka liked the 115 DTAC, using H4831SC I believe. Warning some 8 twists won't handle the DTACS, Broughtons I heard were like 1-8.3.

Most people shooting the DTACS like a 1-7.5 twist.

6BR shootings are using the 107 SMK's and the 105 scenars. Some scream the 95 bergers.

I believe many people still perferred the 105 scenars even in the XC.

However when you change to a .243, 243AI, 6x.284, 243WSSM..you might get the velocity to make make the 115 DTAC hard to beat without pushing the crap out of your rifle.

RHINOUT!

 

[jimm]

I got 3150 in my 243 AI with 115 DTACS . What I didn't get was accuracy , the accuracy node was quite a bit below that .

My bbl is a 7.5 twist Schneider and it is 26" . It will shoot in the ones with the 107smk at 3050 but I have been chasing an accurate load with 115's long enough to say stop with this bbl , it shoots too good with the 107's to use up anymore bbl life . Gonna go to 30" with the next Schneider and try RL 25.

Jim B.

 

[joesr]

The current load I'm shooting gives me 3124,average) from 115 DTAC's and it is very accurate.

I'm shooting the 6CM with 49.5 gr of H1000 out of a 28" Kreiger tube in 1:7.5. I think, given the velocity it should work out of a 1:8.

Given the information on the 243AI I'm liking the 6CM even more.

I'm the one selling the barrels and you should check out the post on 6CM updates. I'm not the only one having this kind of success with this cartridge.

Joe Hendricks
hendricks4@comcast.net

 

[memilanuk]

Wow. 49.5gr. Guess I should have read that a little closer. I started out today @ 45.0gr in a plain .243 Win, w/ a 115gr DTAC 0.020" off the lands,2.251" as measured by SP comparator)... 45.0gr was good for ~2850fps or so. Later I loaded up some more and tested from 45.5gr thru 48.2gr... 65F out, not a sign one of pressure of any sort. Unfortunately the portion of the range where I did the later testing @ 200yds is not real friendly to setting up a chrono if one wants to shoot from a bench, so I don't know how fast that got up to. Half-tempted to push a little more, though I must say I'm definitely into the compressed range already, w/ that seating depth and 48gr of powder.

Monte

 

[chuckw2]

Monte,
You using H-1000 or VV N-165?


Chuck

 

[memilanuk]

H1000

 

[paulT]

Loaded 50gr of n165 in my 243 with Lapua 90 molly scenars es of 7 av vel 3270 with lapua brass and cci benchrest, is H1000 giving low es and roughly same vL as n165? im shooting a 24 inch barrel, regards, paul T.

 

[memilanuk]

Paul,

I'm shooting naked 115gr DTAC's out of a 28" Pac-Nor 1-8" twist. Never shot N165, so can't say how they compare. So far I'm just doing load development, i.e. trying to find the sweet spot,looks like ~47.5gr/3050fps so far) and then I'll pursue tweaking seating depth, etc. after that. So far the max I went up to was 49.1gr and about 3100fps.

Monte

 

[1shot]

I just got my Broughton 1-8 twist installed. It finished at 29" Anybody found a good load for H-1000 with 105 Scenars for 6 XC?
Thanks,
1shot

 

[joesr]

I just got my Broughton 1-8 twist installed. It finished at 29" Anybody found a good load for H-1000 with 105 Scenars for 6 XC?
Thanks,
1shot

Can't do it. H1000 is too slow for the 6XC. You have to shoot David's loads of H4350 with moly coated bullets to get the velocity.

The 243 and 6CM have a much larger case capacity and that allows the use of powders like H1000.

Joe Hendricks

 

[paulT]

Rewinder, noticed you are using magnum benr primers, are they giving you more veL, compared to cci benchrest or fed match, also are you getting better groups by using magnums in your rifle. Regards paul T.