AusVarmint

HI
Can you please help me out with some "what ifs" I'm working on?

Becasue of my operations etc I'm not able to handle much recoil. I'd be able to handle a 6.5x55 in LG but I wouldn't be able to lift it to the line to shoot it.
I may be able to handle a 6.5x55 in 17 kg cass LG but there arn't many comps for that down here.

I am building a 30 BR as a light .308 ( recoil issues) I have a Full bore barrel that I'm using.

This is the part where I need your help-- possible projectile and powder selection.

What weight projectile can I use that the 30 BR with 27-30 grains of powder capacity to burn can I use to get out to 1K with the projectile still being S/S. The barrel will finish up somewhere around 28 inches.

I want to build it to the Benchrest LV weight category so I can
compete in as many differnt comps as I am able to.

I know it's not the best option for this but it's the only one I have if I'm going to get on the mound or bench to compete at all.


in the ADI book it lists 125 grainers using 50 compressed of 2208 to get 3150 as a max load.
There are plenty of loads that have been lisdted by BR guys in the stated that list the 118 at 3000 fps using 4198 or benchmark. even a load listing the 125 BIB moly at 3000 using 4198.

a quote from the 30 BR page on 6mmbr.com
(snip)
Currently, the 30BR is used almost exclusively for Benchrest competition. However, we think it has great potential for other applications given its inherent accuracy and superior efficiency. The 30BR can drive a 118gr bullet faster than the 6BR case can drive a 105gr bullet. In fact, the 30BR can push a 125gr bullet faster than a Rem 260 can drive a 123gr Scenar, despite using 10 grains less powder. Using suitable hunting projectiles, the 30BR is a viable deer-hunting round, with ballistics superior to the venerable 30-30. A 112gr bullet going 3000 fps is also going to make quick work of a coyote.
(endsnip)
I extraporlated the velocities gotten by the guys in the states for 30 Br's using 112, 115 118 and 125 grain projectiles also found what BOB in Mackay said he was able to get with his 30 BR and 125 NBT in previous posts.
I compared them to listed 308 Velocities with the same weight projectiles and found about 250 FPS less with the 30 BR than the 308.
I then took the .30 cal 180 A-max (BC of .580) and got the avg of the 308 velocities with a 180 from 2 books (ADI and Nick Harvey) and took 350 FPS off just to be sure.
Gave me a start velocity of 2350 for the 30 BR- at that velocity the 180 A-max is still doing 1225 FPS at 1000 yards acording to an online ballistics program I found.

One gun for all comps and make it the best I can- well thats what I'm doing such as it is. It's all to do with total cost and expected recoil produced. I calc the recoil from another online program I found- it's rough figure but I came in under the 6.5x55 with 142's and they were at the limit of my tolerance so I think it will work.
Do you think my thought process is logical and have I missed out something in my rough reckoning??
If yes what??


So what can you recomend I try and what sort of velocities will I be looking for to stay S/Sonic at 1K??

I know the wind etc will be hell but it's what I have and what I'll have to learn to deal with.

Thanks

later
P

I think you maybe expecting a little to much out of the 30BR to work at 1000yds.

The standard 6mmBR would be by far a better choice, as you can run both the 107's for long range, and the 88 FB bullets for short range, and still should be able to touch the lands.

A LV rifle has a limit of 10.5lbs, and with a 28" barrel, you might be struggling to make weight.

CHeers
AI

ogre6br,
I tend to agree with Ackley Improved in so far as the 30 BR.
6 BR will be able to foot it with the PPC's in short range if you do your bit, by that I mean you can be competitive.
The 30 BR thus far has some issues in short range that have seen it win score matches more so than BR, not saying it can't get there just that its not there yet.
The 6BR is also capable of being competitive in 500 yd / 600yd competion, this is just a proven fact. Plenty of 6BR's on the F class ranges I think.
At 1000 yds the 6 BR will shoot as well as you can I imagine.
Its more able to work across the course.
Failing that a 6.5 x 47 might be worth a look.
Turn up to Little River for the Fly shoot and you will be better able to talk about this stuff and see things in situation.
Just ring Leanne Van Muers and book a seat for the shoot (Leanne's number is in the mag in the comp section, if you cant find it let me know and I pm it)
I can also show you a few ways to make your stock weights work in the different categories ie LV 10.5lbs to LG 17lbs

cheers
Rinso

Heres a plan

Action around the 32oz mark
26" LV taper barrel, fluted
McMillan edge stock 24oz
jewell trigger
Aluminium rings
Weaver T36 scope (light weight)

Caliber, a improved 6mmbr. there is the BR-DX, which retains a longer neck length over the dasher and BRX, but gives you more powder capacity than the standard round.

With the improved round, you can gain the velocity you lost with the short barrel to make the 10.5lb. The 107's for L/R, and the 88FB for short range.

Although, here is a fair bit of money invested in a rifle that is not perfect for either competition.

Cheers
AI

ogre,

You wont make LV with the barrel at 28". I will guarantee a LV will knock you around too much. You can give up on the idea of using anything over BM2 burning rate because it wont fit in the case and give the velocities you need to get to 1000yds with heavier projectiles. Considering Canberra is the closest 1000yd range to you I don't think you will ever shoot it at 1000yds anyway. You are better off building it to 13.5lbs for HV and getting someone to carry it for you. The only event you wont be able to shoot is LV.

I did a LV 30br for a friend who has neck problem. I told him it would hurt him but he wanted it anyway. I left the barrel at 24" and put a 500gm weight in it and told him to try it and if it was ok I would cut it back to LV and remove the weight. The rifle weighed 12lb. He fired one shot out of it and hurt himself enough to put it away.

Stick with projectiles around 125gns. There's no such thing as an all round target rifle. The closest would be the 6br but that's no use to you because you already have the barrel for your 30br.

Steve

G'day Ogre,
if you are wanting to shoot 100/200/300 BR, just get a LV and learn to shoot it, get your bag/gun techniques perfected, a heavier platform will disguise any bad habits you may have. Changing weights from LV to HV IMHO is a waste of time. Many great shooters use one gun (in the US a SPt/LV = same gun) and they know how to use it well and that's a fair percetange of the US WBC team. Certainly use a 6BR if you want to as any Victorian Br match, the wind we get probably wont show the difference between a 6ppc or 6BR. That way you can build a gun with a weight system and a fast twist 6BR for F class, LR BR, Fly etc. It may well be an advantage to shoot 200yd BR with a 6BR and 105's............

Again just my thoughts. At least this way you can cover most events reasonably well from 100 to 1000.

Cheerio Ned