short range accuracy with 1:8' twist?
- Thread starter SanQ
- Start date
I would try heavy BT bullets,Berger 105bt or 108bt) or the other option would be 80g flatbase bullets with a very light load to keep speed down...
I would try some Bart 66-68 or Fowler 66 gr ....they have did well for me...and as with most bullets jam-em gently into the lands...if you can feel the bolt cam over they are too tite...push em in a lil untill you barely notice the bolt closing...you need the action-ctg. combo to work as smooth as possible for quik and e-z cyclic rate of fire...nothing breaks your concentration like stiky bolt closing or opening! I have had a few problems with "non" benchrest quality bullets but if you stay with premium "botique" brands that can withstand the tremendous rotation speed that is encounterd at 3700fps in an 8-twist bbl. they will put a grin on ur face....your rifle will tell u what it likes,,if the bbl is long,28"+) Rx-15 has been known to work,,,if it is short,,the usual point blank powders suffice....This is why my latest 8-twist bbls. all are throated what some folks may see as short...but with the long useable neck of the BR,.310 +/-) the long,105 class) bullets can be seated foreward of the donut..and the short 68gr class will be seated with aprox. .120-.150 of shank in the neck. Roger
PS...there is a well established myth that has lots-0-folks thinking that you gotta have a 14-twist to shoot the lil bullets..look at the groups that are being shot with the 105-108's at 500-600yds...if a gun will shoot under and inch at 600 ....guess what it will do at 100!!!ooooo yea that aint with lil bullets ..but .. LIke most things in life,,just fiddle with it a lil and it will pay off.
PS...there is a well established myth that has lots-0-folks thinking that you gotta have a 14-twist to shoot the lil bullets..look at the groups that are being shot with the 105-108's at 500-600yds...if a gun will shoot under and inch at 600 ....guess what it will do at 100!!!ooooo yea that aint with lil bullets ..but .. LIke most things in life,,just fiddle with it a lil and it will pay off.
wnroscoe
30 grains of Varget, F205M primer, Berger 105 VLD .015" in the lands and .0015" to .002" neck tension shot a .166" at 100 yards for me.
Try 31.5g of N135 with a 65-68g FB to just touch,if you can) and surprise yourself!!
Forum Boss
Administrator
My 8-twist shoots great with 80gr flat-base Bergers about .015 into the lands with a stour load of N135.
Not saying this is the perfect combination, but I've shot a few groups in the high ones with this combo. The Bergers, BTW, shot WAY tighter than VMax 75s in my barrel. High ones for the Bergers. .5s and .6s for the Vmax.
Not saying this is the perfect combination, but I've shot a few groups in the high ones with this combo. The Bergers, BTW, shot WAY tighter than VMax 75s in my barrel. High ones for the Bergers. .5s and .6s for the Vmax.
NC/Br Shooter
Silver $$ Contributor
Shot a match yesterday with that load.
Shooter13
Gold $$ Contributor
And?
Shooter13
Gold $$ Contributor
Jeff, I'm just starting with mine, I have N140, N150, N540 and Varget. I have 90 gn Berger Target BT and 95VLD target, any advise would be appreciated.
95 Gr Bib Flat base. 31.2 Gr N140, BR4 primers, Seated at touch +.006. 6BR 8-twist Bartlein barrel. Varget works good too. 90 gr Berger and H4895 works good too.
edit: added powder charge for N140.
PopCharlie
edit: added powder charge for N140.
PopCharlie
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Not a 6br but a 1/8 twist 6brx. At a hundred yards doing load development. All are just 3 shot groups but it repeated it self several times. These are jumped between 15 and 20 thou. With a mild varget load. 105 hybrid . This is a shorter barrel brx only 25 inches. Will see how it does this weekend at 600.
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Hoot
Silver $$ Contributor
Well, I loaded up my first range day (TBD) experiments. Since the previous owner said it shot lights out with 105 Hybrids over 30gr Varget, my first rounds will be the same bullet over 29.6, 29.8, 30 and 30.2gr Shooters World Precision (Varget analog) to calibrate QuickLoad and get a feel for how this (new for me) rig behaves. I have around 7lbs of SWP but less than a pound of actual Varget left. On more of a lark, are 65 Vmax over 32.8, 33 and 33.2 N135 and also over 31.3, 31.5 and 31.7 LT32. Foulers will be the 56 Vmax over 32.1 of
(ole reliable) AR-Comp. I have about 5 pounds of it left. All bullets seated at hard stop+ for starters.
"The waiting is the hardest part" Its been a long 5+ months of winter. soon to be 6 by the time comfortable shooting weather returns up here.
Hoot
(ole reliable) AR-Comp. I have about 5 pounds of it left. All bullets seated at hard stop+ for starters.
"The waiting is the hardest part" Its been a long 5+ months of winter. soon to be 6 by the time comfortable shooting weather returns up here.
Hoot
Sierra 107 MK's, "tipped" / Pointed are, in the .2's and .3's in My 6 XC seated at, a Lite "Jam" ( .010 / .015 Marks all around Bullet ) with, 10 More grains of StaBall 65, Powder ( 40.5 ), in a 1-7.5 Twist.
The 80 Berger FB shoots, extremely WELL, also ( I have NOT done, much seating, "Testing" but easily, in the 3's )
Found that, for Fast Twists, it's best to slow the Lighter weight Bullets, "Down a Bit" for, Accuracy !
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I think bullet jackets are better than they used to be, for starters. But otherwise, I've seen a 8 twist shoot well ONCE and conditions were nasty. I'm not sure where the break point is but I'm always testing this kinda stuff and will be campaigning a 10tw 6mm some this season. I've done it before and had just fair success but it wouldn't agg with my other stuff. Gotta test to know for sure but I don't know of any serious contenders shooting anything faster than a 12 twist. That does work with today's bullets. I know that and have a Natty to prove it does. That doesn't mean every bbl and bullet will shoot to that standard, though, especially as we get faster and faster twist wise. IME, the long heavies won't CONSISTENTLY shoot with the lighter bullets in a bbl that is twisted even close to right for it. There is a small bc advantage to a better stabilized bullet but you better not hang your hat on bc at short range. If you pull the trigger at the wrong time and the others don't, you'll lose badly. Simple as that and I'm speaking from experience. You can't bc them to death.
OMW57
Silver $$ Contributor
Mike, I ran a 10 twist for 4 years when I started shooting SR at my club, I tried some bib 95 FB's, they shot great but I couldnt get enough of them in time so I went with 90 Berger BT's, also shot real well, it wont run with a PPC but it did well enough to garner me club champ for 4 years!, Some of the other guys switched to 30BR & I was getting whooped up on regularly so I swiched to 30BR also, TOUGH CROWD!,
Sorry, I forgot to mention, we shoot score at the club!
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