6br quickload powder choice help

[skany]

Hi guys

 

could some kind chap help me chose the optimum powder for these two bullet combinations please!

 

im thinking vit 133 0r 135

 

info on rifle

 

27"

58-65g vmax

lapua case

2.198 coal

 

looking for something to put me near the top end of the mv scale

 

cheers Andy

[baldie]

I,m using 135 with a 90 grain silver scenar, and getting 3150 fps. If thats any good, i will dig out the exact load data ?

[TC]

I modelled both when working up my load for 68gr FB's and 133 gave considerably higher velocity in my 24" barrel but your 27" barrel may make it moot. As I recall, 135 was not fully burnt within 24" with 68gr. With a higher charge behind a 58gr bullet I suspect you will see the same with a 27" barrel.

 

If you take a look on 6BR.com 135 is pretty much the recommendation for accuracy loads but as mine was primarily intended as a vermin/fox load I went with the extra velocity of 133 and have not been dissapointed with the results.

 

I have changed laptops but should still have the data on my old one somewhere if it would help you. I would recommend 133 as the starting point if higher velocity is the goal.

 

Tony

[skany]

I,m using 135 with a 90 grain silver scenar, and getting 3150 fps. If thats any good, i will dig out the exact load data ?

 

 

thanks Dave but i have vit 140 & 150 to hand wich i think work well with the heavyer bullets!

 

its really the powder of choice for the lighter heads im intrested in mate but thanks very much anyhow:-)

 

Cheers Andy

[Finman]

thanks Dave but i have vit 140 & 150 to hand wich i think work well with the heavyer bullets!

 

its really the powder of choice for the lighter heads im intrested in mate but thanks very much anyhow:-)

 

Cheers Andy

 

 

33gn Viht N135, Rem 7.5, Lapua case, 65gn VMax, and I am getting one hole groups with a 3400fps out of a 23' barrel. Foxes hate it...

 

best wishes,

 

Finman

[6mmBR]

Take a look here.

http://ukvarminting.com/forums/index.php?showtopic=8216

Cheers

Dave

[skany]

33gn Viht N135, Rem 7.5, Lapua case, 65gn VMax, and I am getting one hole groups with a 3400fps out of a 23' barrel. Foxes hate it...

 

best wishes,

 

Finman

Hi there

 

that decent speed form a 23" tube

 

thinking id be nearer 3500 with a 27" tube

 

ill see wht i can beg steel or borrow powder wise before i buy a keg:-)

 

cheers Andy

[skany]

Take a look here.

http://ukvarminting.com/forums/index.php?showtopic=8216

Cheers

Dave

 

 

thanks for that dave

 

some useful data for vit powders with the heavys too:-)

 

out of intrest how much of the neck are you guys sizing?

 

its f*&*&*n huge lol

 

cheers Andy

[Laurie]

Andy,

 

I've tried various 55-85gn varmint bullets in a 28" 1-8" twist 6mmBR Norma barrel throated for 105s, also in well used condition. In theory, these bullets just shouldn't shoot in this barrel, but some combinations worked well even if they wouldn't produce quarter-inch bugholes. (For that matter neither would my 105gn VLD match load by this point thanks to the barrel wear - the rifle is about to be rebarrelled as 6BR-DX.)

 

55s (Nosler BST mostly) worked very well with some of the faster burning powders, notably AA-2015 and Hodgdon Benchmark. I didn't try N133/135 with this weight. Generally equivalent burning rate powders including some recommended on 6mmBR.com didn't work over well for me - 100yd groups around the inch the norm - this is with H4895 and AA-2230.

 

Here's some reasonable ones:

 

55 Sierra BlitzKing 28.5-30.5 AA-2015 0.3-1" 3,350 fps

55 Sierra BlitzKing 29.5-31.5 H Benchmark 0.5-0.9" 3,416 fps

55 Nosler BT 26.5-28.5 N120 0.5-0.8" 3,618 fps

55 Nosler BT 26.0-28.0 Re7 0.45 - 1" 3,442 fps

55 Nosler BST 28.5-30.5 AA-2015 0.26-0.85" No chrono readings

 

58 V-Max 28.5-30.1 AA-2015 0.3-0.75" 3,277 fps

58 V-Max 28.5 - 30.0 Re10x 0.6-0.9" 3,384 fps

58 V-max 26.8-28.5 Re7 0.45 - 1" 3,420 fps

58 V-Max 28.3 - 30.0 N130 0.5-1" 3,520 fps

 

 

I haven't tried the 65gn V-Max, the nearest wight equivalents being the 70gn Nosler BT and Berger HP Varmint

 

70 Nosler BT 29-31 H Benchmark 0.35 - 0.45" 3,374 fps

70 Nosler BT 28.5-30.5 N530 0.35-0.75" 3,252 fps

70 Nosler BT 30.4-32.1 N135 0.45-0.7" 3,375 fps

 

70 Berger Flat-base HP 30.4-32.5 N135 0.45-0.75" 3,350 fps

 

All combinations were 5 x 5-round groups rising in 0.3-0.5gn steps benchrested at 100yd. MVs are for the heaviest charge tried. The long BR Norma throat will drop MVs and pressures compared to a short-throated varmint rifle barrel. 55s and the 58 were seated very shallow and still had a big jump into the leade.

 

I hope these help. In my barrel at any rate, Benchmark seems to work particularly well with bullets in the 55-70gn weight range

 

Laurie

[skany]

Andy,

 

I've tried various 55-85gn varmint bullets in a 28" 1-8" twist 6mmBR Norma barrel throated for 105s, also in well used condition. In theory, these bullets just shouldn't shoot in this barrel, but some combinations worked well even if they wouldn't produce quarter-inch bugholes. (For that matter neither would my 105gn VLD match load by this point thanks to the barrel wear - the rifle is about to be rebarrelled as 6BR-DX.)

 

55s (Nosler BST mostly) worked very well with some of the faster burning powders, notably AA-2015 and Hodgdon Benchmark. I didn't try N133/135 with this weight. Generally equivalent burning rate powders including some recommended on 6mmBR.com didn't work over well for me - 100yd groups around the inch the norm - this is with H4895 and AA-2230.

 

Here's some reasonable ones:

 

55 Sierra BlitzKing 28.5-30.5 AA-2015 0.3-1" 3,350 fps

55 Sierra BlitzKing 29.5-31.5 H Benchmark 0.5-0.9" 3,416 fps

55 Nosler BT 26.5-28.5 N120 0.5-0.8" 3,618 fps

55 Nosler BT 26.0-28.0 Re7 0.45 - 1" 3,442 fps

55 Nosler BST 28.5-30.5 AA-2015 0.26-0.85" No chrono readings

 

58 V-Max 28.5-30.1 AA-2015 0.3-0.75" 3,277 fps

58 V-Max 28.5 - 30.0 Re10x 0.6-0.9" 3,384 fps

58 V-max 26.8-28.5 Re7 0.45 - 1" 3,420 fps

58 V-Max 28.3 - 30.0 N130 0.5-1" 3,520 fps

 

 

I haven't tried the 65gn V-Max, the nearest wight equivalents being the 70gn Nosler BT and Berger HP Varmint

 

70 Nosler BT 29-31 H Benchmark 0.35 - 0.45" 3,374 fps

70 Nosler BT 28.5-30.5 N530 0.35-0.75" 3,252 fps

70 Nosler BT 30.4-32.1 N135 0.45-0.7" 3,375 fps

 

70 Berger Flat-base HP 30.4-32.5 N135 0.45-0.75" 3,350 fps

 

All combinations were 5 x 5-round groups rising in 0.3-0.5gn steps benchrested at 100yd. MVs are for the heaviest charge tried. The long BR Norma throat will drop MVs and pressures compared to a short-throated varmint rifle barrel. 55s and the 58 were seated very shallow and still had a big jump into the leade.

 

I hope these help. In my barrel at any rate, Benchmark seems to work particularly well with bullets in the 55-70gn weight range

 

Laurie

thanks mate some more inresting info there

 

can wait to get this thing now:-P

 

 

i shall be throating in ino mans land between .60-.100 so im hoping i cna cover all bases!

 

cheers andy

cheers Andy

[6mmBR]

Andy mate sadly you'll struggle to cover all bases.

If you throat for 105's you'll struggle with anything much lighter than 75gns and keep the bullet in the case and near the lands.

Also vice versa if you short throat it.

I would opt for a throating which allows you to shoot 105's much better long range also can use 87 Vmax which has a pretty good BC aswell.

Cheers

Dave

[Scotch_egg]

I have been buying up all 87gr v max that I can find. Not many arount at the minute. Norman clarkes was out as are my local shops. Managed to find some at Trent firearms last week.

 

Can't wait to take delivery of my 6mmbr. I've gone with 26 inch barrel. We will be able to compare velocity loss over that inch difference.

 

I take it you are putting thos barrel on the lawton?

[skany]

Andy mate sadly you'll struggle to cover all bases.

If you throat for 105's you'll struggle with anything much lighter than 75gns and keep the bullet in the case and near the lands.

Also vice versa if you short throat it.

I would opt for a throating which allows you to shoot 105's much better long range also can use 87 Vmax which has a pretty good BC aswell.

Cheers

Dave

Hi Dave

 

ive always been a tryer mate

 

from my workings others peoples coal i fiqure im somewhere around .74 -76 lead ad with my dumy round it mate!(it may change a bit yet!)

 

that puts the base of a Amax just above the neck shoulder junction & a 65g vmax with plenty in the neck when at the lands!(well within reason)

 

it seems a a couple of lads of here are running quite short leads for the heavys of around .60 & they are shooting 105g amaxs very well!(with the bullet right at neck shoulder junction!)

 

time will tell if it will cover all bases!

 

im after quite high mv with the light stuff as it has to replace my 243ai to

 

i think the 87s may be a bit slow after the ai with 65s

 

 

a guy i knows rpa shoots 55 & 58 real well at warp factor 9 with a 1-8 tube throated for heavys so go fiqure i guess!

 

 

time will tell!

 

cheers Andy

[skany]

I have been buying up all 87gr v max that I can find. Not many arount at the minute. Norman clarkes was out as are my local shops. Managed to find some at Trent firearms last week.

 

Can't wait to take delivery of my 6mmbr. I've gone with 26 inch barrel. We will be able to compare velocity loss over that inch difference.

 

I take it you are putting thos barrel on the lawton?

 

 

yes mate its going on the lawton!

 

wht throat have u gon for out of intrest?

 

cheers Andy

[onehole]

Hi,thought I would send this in just to have a look at.Pictured here are rounds from my two 6br,s one on the left is 8 twist and 12 twist on the right.The 8 twist has a 105 Amax loaded 10 thou off with 30g of 140 and plenty of room for more.Beside the round and as level as I can get it is also a 105 Amax to see where it sits.The 12 twist has a 75 Vmax loaded with 31.5 of 135 and again a 75 head lies beside it to show placement at 10 thou off.

Both rifles have the same reamer and were chambered by Russ Gall at RG Rifles.He would know which reamer he used but I,m afraid I cant remember other than I know my request was for as short as throat as possible to be able to use lighter heads if I wanted in the 8 twist.

The long 105 Amax sits right at the shoulder junction and there is no doughnut [must have neckturned just the right amount]

Hope this was useful,cheers Onehole.

[skany]

Hi,thought I would send this in just to have a look at.Pictured here are rounds from my two 6br,s one on the left is 8 twist and 12 twist on the right.The 8 twist has a 105 Amax loaded 10 thou off with 30g of 140 and plenty of room for more.Beside the round and as level as I can get it is also a 105 Amax to see where it sits.The 12 twist has a 75 Vmax loaded with 31.5 of 135 and again a 75 head lies beside it to show placement at 10 thou off.

Both rifles have the same reamer and were chambered by Russ Gall at RG Rifles.He would know which reamer he used but I,m afraid I cant remember other than I know my request was for as short as throat as possible to be able to use lighter heads if I wanted in the 8 twist.

The long 105 Amax sits right at the shoulder junction and there is no doughnut [must have neckturned just the right amount]

Hope this was useful,cheers Onehole.

 

 

awsome pics dave

 

thanks very much mate

 

whts the mv of your 75g load ?

 

cheers Andy

cheers Andy

[Scotch_egg]

I have gone with a 105 throat and 1-8 twist. I shoot in the hebrides twice a year with strong winds. I can compare it to the american prairie dog fields, vast and flat. Hence the thoughts on the requirement for a wind bucking 105.

 

The first time with the 6mmbr is in mid october. We were hoping for september but my leave was denied. I hope the rain stays away, during this time we will exclusively shoot the 87gr v-max primarily for explosive factor and the reletavely good BC.

 

I have chosen varget powder because of my great success with my 7-08 and also the results on 6mmbr.com. I have purchased my varget from norman clarkes in the 8lb tubs.

 

I will be giving a full write up on my experience the 6mmbr as soon as I get back from the Hebrides.

[onehole]

Hi Andy,Velocity on the chrony is 3300 but my chart works with 3250 which is probably about the actual velocity.I am convinced my chrono is a bit fast and most of my rifles work to the charts a little better with at least 50 fps knocked off.This seems to be a medium pressure accuracy node which was the first to really group consistently so have stuck with it.The next node was getting pretty hot and not really where I want to be all the time and no need.cheers mate.

[skany]

Hi Andy,Velocity on the chrony is 3300 but my chart works with 3250 which is probably about the actual velocity.I am convinced my chrono is a bit fast and most of my rifles work to the charts a little better with at least 50 fps knocked off.This seems to be a medium pressure accuracy node which was the first to really group consistently so have stuck with it.The next node was getting pretty hot and not really where I want to be all the time and no need.cheers mate.

 

 

thanks david

 

cheers Andy