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Head space question

 
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  #1  
Old 02-17-2014, 10:55 PM
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Head space question

I recently installed a 26" barrel on one of my 204s and have some questions. This barrel does not allow me to shoot as high of pressure ie powder charge as my stock 22" rifle. As a result the velocity is also not as high.

For example I can load 24.7 grains of h4198 in my 22 and get 3780. With the 26 I max out at 23.5 and 3700.

I am using PTG hs guages and tried to set hs as close to same as the stock rifle as possible. Using the go Guage I run it to where I just get a little resistance, similar to the stock rifle. If run a piece of tape on the base if the Guage the bolt won't close.

Ok so is this a problem with not enough hs? Should I set the barrel a little looser? I just don't get it. I expected 100 fps faster at same powder levels but can't get there. Another weird deal is factory Hornady ammo will in fact to about 100 faster. Accuracy is fine with my hand loads. Shooting around .25 or less moa.
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  #2  
Old 02-17-2014, 11:40 PM
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Re: Head space question

Don't muck about with the head space , you could make it too long and start stretching cases. It is most likely associated with bore tightness and maybe smaller chamber dimentions of the new barrel .
Try using a tad slower powder and rework the load . It may make better use of the longer barrel .
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Old 02-18-2014, 09:15 PM
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Re: Head space question

I agree that's the same thing I was thinking
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Old 02-18-2014, 10:25 PM
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Re: Head space question

Quote:
Originally Posted by Mark611 View Post
I agree that's the same thing I was thinking
They say that great minds think alike
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Old 02-18-2014, 10:48 PM
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Re: Head space question

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Originally Posted by BrentM View Post
I recently installed a 26" barrel on one of my 204s and have some questions. This barrel does not allow me to shoot as high of pressure ie powder charge as my stock 22" rifle. As a result the velocity is also not as high.

For example I can load 24.7 grains of h4198 in my 22 and get 3780.
With the 26 I max out at 23.5 and 3700.

Accuracy is fine with my hand loads. Shooting around .25 or less moa.

+2 on the headspace thing. Sounds right to me.

Hmmm... less powder, almost as fast. Same 1/4 moa accuracy.
A couple of thoughts if I may. Maybe it's the powder? Maybe 24 grains is not enough powder to use 26 inches of barrel?
Could the old tube be one of those fabled fast barrels?
Hodgdon starting load is 25.5, H335, 3665 fps. If you can't get this much powder in, how deep is your bullet seated? Have you tried a drop tube?
Last thing, tell me about your chronometer.
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Old 02-19-2014, 08:57 AM
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Re: Head space question

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Originally Posted by 4bycamper View Post
+2 on the headspace thing. Sounds right to me.

Hmmm... less powder, almost as fast. Same 1/4 moa accuracy.
A couple of thoughts if I may. Maybe it's the powder? Maybe 24 grains is not enough powder to use 26 inches of barrel?
Could the old tube be one of those fabled fast barrels?
Hodgdon starting load is 25.5, H335, 3665 fps. If you can't get this much powder in, how deep is your bullet seated? Have you tried a drop tube?
Last thing, tell me about your chronometer.
Almost as fast? 100 fps slower in a 4" longer barrel is not almost as fast IMO.
24 grains maybe not enough, I agree, but I am at max with 23.5 w as mentioned.
H335? Never tried it so I have no clue if that powder would fit in the case. I would imagine it would since I can get 28.5 H4895 and Varget in there. Bullet seating is .100 off the lands and fills 75% of the neck.
Chrono is f1. However, I verify all my loads once a shooter is established. For the 204 I verify 500-700 yards. For my LR rifles I verify 500, 1000, 1500.
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  #7  
Old 02-19-2014, 10:25 AM
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Re: Head space question

Quote:
Originally Posted by BrentM View Post
Almost as fast? 100 fps slower in a 4" longer barrel is not almost as fast IMO.
24 grains maybe not enough, I agree, but I am at max with 23.5 w as mentioned.
H335? Never tried it so I have no clue if that powder would fit in the case. I would imagine it would since I can get 28.5 H4895 and Varget in there. Bullet seating is .100 off the lands and fills 75% of the neck.
Chrono is f1. However, I verify all my loads once a shooter is established. For the 204 I verify 500-700 yards. For my LR rifles I verify 500, 1000, 1500.
80-100 fps... OK I hear ya. 3700 is still pretty fast. What weight bullet?
H 335 is a flaked powder. You can fit a bunch of it in a .223, I bet it will compact nicely in your 204. Might fix the velocity thing.

Varget is small pellets, it doesn't pack quite as nice, but it works all season. It's our AR powder. We go through pounds of it every year.
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