[Bushmaster Recon]

Okay so the accuracy of my rifle is sorted. Now I'm thinking I would like a bit more range. I have to keep within our 1 joule limit but I would like to be shooting at around 0.9 joules. My gun is shooting at the moment at around 0.8 joules.
Have you got any ideas or is it not worth doing?

 

[Cheese Man]

ER-hop, LRB, and taper the cylinder head. That should add the .1J you are looking for, and give you some added range.

 

[MiloXC3]

What weight ammo are you using?

 

[Bushmaster Recon]

Currently I have been using 0.2 bbs. I know a lot of people think that they are too light for accuracy but with under one joule, they seem to be the best for range and accuracy.

 

[Wolfgeorge]

You should try .25g and .30g bbs to be sure! I've used .30s in GBB stock pistols and had some great results!


Wolf

 

[TheTJ]

You should try .25g and .30g bbs to be sure! I've used .30s in GBB stock pistols and had some great results!

Wolf

Agree with Wolf. I use .28's in my GBB pistol with zero problems. I can't any reason why it wouldn't agree with your rifle!

 

[MiloXC3]

* Only if you can apply enough hop up. If you have the TDC adjuster then .25 or .30 should work well!

 

[Masterjuggler98]

I use my .3g bioshots in my GBB that gets a little under 300fps with .2g. I still have to figure out how to take it apart to modify the hopup though because it is one of those cheaper ones that was never meant to be upgraded or used past 80 or 90 feet. As long as you get the hopup right you can get that bb to float out there, although at that point they might not even feel it.

 

[reezo]

Same here, my 2 cents get dropped in the same jar as TheTJ and Wolf's

I would move away from .2g and experiment with .25g, .28g and .30g

Anything over that might be too sniper-specific but those three weights are definitely going to amaze you compared to the .2g

 

[Bushmaster Recon]

Yeah the only thing is, is that for me the accuracy with .2s is great with the large majority of my kills are one shot one kill. As far as I remember almost all of my kills have been one shot kills unless I was getting out of range with my rifle hence the want of increased range. I have tried .28s but i found that the loss of range was too much of a compromise for accuracy. I understand though that if I am to upgrade the range I will probably need heavier bbs.

 

[woogie]

If you were to use say bioval .27's with an ER hop and an LRB you could keep it the same FPS but gain the much needed accuracy and precision.

 

[Bushmaster Recon]

I already said that Im sorted with accuracy so i dont need to fix that, its range Im tying to get. Also, the selection of bbs here in ireland is rather limited. I havent seen bioval anywhere and I dont even think you can get 0.3s. The market is mostly dominated by king arms, excel, and different store designed brands.

 

[zero]

If you're going to be planning on using anything near 0.28/0.30's, wouldn't It just be easier to use Maruzen 0.29 Super grand masters? Expensive but effective, fortunately a well known UK shop stock's them so I have a supply!

Zero

 

[Masterjuggler98]

Don't manufacturers like bioshot ship internationally? It might be a little more expensive with shipping but it is worth it in the end in my opinion. If they don't then you can order bbs from a site not US based.

 

[woogie]

Because if you are going to be using a heavier weight ammo you are going to have to redo everything with the accuracy and range.

The heavier the ammo the less range you will have, unless you do something to make up for it ( the ER hop or LRB )

 

[oiric]

Only tried .28s? How was the result with .25? And have you considered .23 (which i beleive i have seen somewhere)?

It's not that you lose range just because you go up in weight on your BBs. Your FPS will drop, but the initial energy is going to be higher. This means that the range will actually be slightly higher than with the lighter BBs. But in order for that to actually happen, you will have to adjust your hopup to compensate for the heavier BB.

IMO you should try .25 or .23 and adjust the hop accordingly. But since you have a 1J limit (which is insane) chances are that you are not going to be able to increase your range that much, maybe a few meters if you're lucky.

http://bbcalc.boopidoo.com/bbbic_adv.html (Just change the "BB Drag Coefficient" to 0,3 as the calculations were corrected after the calculator was made)
Here is a calculator that one of the fine players here in Sweden have designed. It calculates the safetydistance of your rifle. All you need though is to see the initial energy after doing a chrono-test with other weights than .2.

Hope it can help.

 

[TheTJ]

I have used GoldenBall .23's and got fairly decent results with lower fps guns I use to stay within a specific MED. But, as far as for a DMR or Sniper build, I would advise against anything lower than .25g. The bb's will only hit their target at maximum range with absolutely pristine conditions (i.e. zero wind, zero brush, zero motion.)

 

[vindicareassassin]

I use .28s in all my 350fps and lower guns, and suffer no loss in range over the full auto queens out there.

I also use .4s in my 350fps M14 SOC16 DMR and it sends them just as far as any other gun shooting a .2..... they just take longer to get there is all :shrug: but when they do arrive its not like getting tickled by a nat that no one notices, its like get hit by a nat swinging a cricket bat :tup:

But like Woogie said on the previous page, your going to have to totaly re-think the mods in your gun to achieve it, as sadly its not a case of screwing bits together and getting results, you'll also need to put in a little DIY effort aswell :nuts:

A long(ER style) hop nub and LRB are essential to achieving long range and accuracy with limited fps.

Try adding some weight to your piston, about half an ounce is enough, this will actualy reduce your fps with a .2 (so you can boost your fps a little to regain what is lost) but with all things remaining equal you will gain fps with heavier ammo. You will have to fit some form of buffer on the cylinder head to help with impacts.

You will also loose fps from having to increase the hop pressure to lift a heavy BB, so again you can boost your spring to compinsate for that lose.

Bore out your nozzle to its maximum, if your using a VSR 5.5 is about as far as you can go with this, then deep port your cylinder head, I dont mean the simple rounding out that you see on the DIY threads, I mean properly air flowing and polishing it, to get as much air out as fast as possible.

There are other things such as nozzle length vs nub depth vs BB positioning to consider aswell, that have a profound affect on BB lift and accurcy, but they are way to complicated and overwhelming to cover here right now :nuts:

 

[Bushmaster Recon]

Okay thanks guys. This really helps.