C.O.A.L too long to extract unfired round

[travis01]

I must be missing something here. Curious how the scope plays into this problem ? If I'm reading the OPs issue correctly, he cannot remove the loaded round due to the adjustable vertical comb. Its in the path of the bolt throwing back and won't allow full bolt throw rearward to remove the cartridge. The scope isn't a factor in this process. If he cannot get the bolt back far enough to remove the cartridge, I'm pretty sure he can't remove the bolt to remove the cartridge. I think that's what seems to be his issue. I don't think my comb will come out of the stock which is why they cut the bolt groove in on top allowing the bolt to throw back completely allowing cartridge removal.

He’s saying to get your line of sight up to a 50mm scope the comb has to be pretty high so the comb gets pulled every time you need to extract

 

[travis01]

You don't need longer bullet's for the twist rate, over spinning bullet's does not hurt accuracy. Only under spinning hurts accuracy. Google it.

It’s not proven to play a factor but it also isn’t disproven. In my opinion more spin=more yaw

 

[284winner]

He’s saying to get your line of sight up to a 50mm scope the comb has to be pretty high so the comb gets pulled every time you need to extract

Guess that part went RIGHT over my head

 

[yotehater]

It might be better to mill out a little of the stock comb. You sure need to be able to remove the bolt.

 

[284winner]

Maybe just a matter of picking up a comb thats notched for the bolt

 

[284winner]

Also notching the front of the port like this may help also. My action will eject 4.25" OAL cartridges. I'm only using .4.005" currently.

 

[284winner]

Unfortunately that 277 MTAC is .04" longer than Berger's 300 elite bullet. That little difference doesn't help

 

[travis01]

Unfortunately that 277 MTAC is .04" longer than Berger's 300 elite bullet. That little difference doesn't help

But the 23 grains of weight makes up for it in a big way

 

[travis01]

Unfortunately that 277 MTAC is .04" longer than Berger's 300 elite bullet. That little difference doesn't help

What’s the length of the 277?

 

[284winner]

What’s the length of the 277?

1.867. The Elite 300 is 1.825

 

[284winner]

What’s the length of the 277?

Kinda waiting on Berger's 329 grain EOL bullet to arrive.

 

[jelenko]

It’s not proven to play a factor but it also isn’t disproven. In my opinion more spin=more yaw

How would more spin increase yaw? Increasing spin should decrease yaw like a gyroscope.

 

[travis01]

How would more spin increase yaw? Increasing spin should decrease yaw like a gyroscope.

From what I’ve been told from some guys, to a certain point until it spins fast enough to throw off the center of pressure. With a right hand twist it will point the nose up more than if your twist was correct which creates a negative effect on your bc.

 

[travis01]

Kinda waiting on Berger's 329 grain EOL bullet to arrive.

I called on it but it isn’t long enough for this barrel

 

[Rdlningcltchdmpr]

It’s not proven to play a factor but it also isn’t disproven. In my opinion more spin=more yaw

It is proven, that more twist than necessary will not hurt accuracy. the difference in accuracy is so small that it is almost not measurable. Google will prove it. Try Google it won't hurt you. Ha ha. I shoot extra light bullet's in many guns and they are always way overspun. And the accuracy is super super. Example- 308 win. 11twist factory Tikka/ 110 vmax bullet at 3350 fps, group= .160" WoW! Also my 338 Lapua with 160ttsx bullet's at 3900 fps / 9twist savage= 1/2" groups wow ! Also 270 win. With 90 grain hp. At 3600 fps= 1/2" or less. Wow! I could go on and on. It's not opinion, it's fact ! Hope this helps.

 

[jelenko]

From what I’ve been told from some guys, to a certain point until it spins fast enough to throw off the center of pressure. With a right hand twist it will point the nose up more than if your twist was correct which creates a negative effect on your bc.

Hmm. I could see how spinning bullets really fast could cause enough of a pressure differential. But, in this case the bullets would all spin at the same rate. What would affect one would affect all, I think.

 

[travis01]

Hmm. I could see how spinning bullets really fast could cause enough of a pressure differential. But, in this case the bullets would all spin at the same rate. What would affect one would affect all, I think.

Right, but a short stubby bullets center of pressure is aimed towards the front of the projectile while the center of gravity is pushed towards the rear like the g1 drag bullets, the g7 has the center of pressure much further back and the center of gravity is more centered so there’s a lot of factors that play in bullet stability that I honestly don’t fully understand but the to the google fella above, I’ve read dozens of conflicting articles but what is proven is a SG of 1.5-2 is perfect so you can over stabilize your bullets and I’ll load mine how I see fit.

 

[284winner]

I called on it but it isn’t long enough for this barrel

Wow. Seems like it'd be super close considering the 300 is only .04 shorter than the MTAC

 

[travis01]

Wow. Seems like it'd be super close considering the 300 is only .04 shorter than the MTAC

But it’s much heavier. Longer and lighter requires a faster twist than shorter and Heavier.

 

[284winner]

But it’s much heavier. Longer and lighter requires a faster twist than shorter and Heavier.

I think I read 9.5 twist. Could be wrong tho. I know my Lehigh defense 257 grain ELR bullets carry an .890 BC and need a 9.5 twist barrel. That bullet is 1.900" long