i have heared that muzzle break cut dow on velosity but have also heared they make it more accurate. so is this true and what do you think about them Good or bad.

It depends on your weapon. While shooting at an animal you wont feel any kick, but while sighting in lets say a 300 the muzzle break would be nice. It all about what you want less kick or more velocity. I would probably get the muzzle break.

Funny stuff right here. I am shooting a 300 accumark wby mag with an accubreak. I am pushing a 180 grain Barnes TSX at 3100 FPS. Fast enough if you ask me and thats with the break. Feels like a BB gun when I shoot it, I could sit all day long and shoot this gun if it werent for such an expensive round. Also I make holes in holes when I shoot, so I guess if you ask me my weapon is fast and accurate enough.

Depending on the setup, muzzle brakes can increase both accuracy and velocity, and they will almost always decrease felt recoil. For example, a .25-06 is pretty comfortable with 3000fps out of a 26" tube - that's about the perfect length barrel for that caliber. If you shorten the tube to say 22" you could lose maybe 200fps. If you have an aftermarket brake installed on a 26" barrel, the bullet still has 100% of the gases behind it that it would without the brake, so there's no loss of velocity. If the barrel has to be shortened for some reason to have the brake installed, then yes you will lose some velocity, but not hardly measureable.

Most brakes are made so that the hole is oversized enough to let the bullet go through without touching the brake, and they all have holes or slots in various places all around the brake to let gasses escape. Since the brake isn't 100% holes, there is still some thrust being exerted on the bullet from the gas, so velocity may increase depending on the length of the barrel. For the '06 we're talking about with a 26" barrel, there's little velocity gain past 26" even in a sealed barrel, but a brake on a 22" barrel on the same gun will probably increase velocity slightly.

As for accuracy...the holes in a brake are normally pointed somewhat back towards the shooter (some also point out and up to keep the muzzle from rising). The velocity of the gas escaping through the holes helps counter the backwards thrust of the rifle, and helps to offset recoil. This also directs the sound out of the holes in the direction they're pointing, so the sound goes back to the shooter more, rather than towards your target. Anyway, the reduced recoil often gives the shooter more confidence that he won't get the tar kicked out of him, so he tends to hold the gun more steady and have a more consistant and gradual trigger pull. Some brakes actually do increase accuracy, but I don't know all the physics of why just yet. When I figure it out I'll let you know

Muzzle brakes shouldnt really decrease your velocity.
They will however greatly increase muzzle blast. Be careful if you are shooting next to someone in a hunting situation.
Some serious hearing damage can result to anyone standing beside you if not protected.

i am shootin a 23'' barrel on my .223 and thought about getting 1 for it, but i plan to buy that 300 WSM and i will put 1 on that. the only reason i was worried abou the velosity is because i was going to turn it into a best of the west kind of gun so wil be shooting long distances. thanks for the info, hope to here more.

Can all guns have a brakes? In store there were only a hand full that had them. I going to get a new REM 700 XCR in a 300 or 338 Ultra Mag can I get a brake for any of them.

as far as ive heard they can.. not a whole lot of guns are sold with factory installed muzzle breaks.. most the ones ive seen were the work of a gunsmith