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6.5 Mystic Rifle for 1000mBR/ F class Competitions

 
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  #1  
Old 08-08-2006, 04:08 PM
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6.5 Mystic Rifle for 1000mBR/ F class Competitions

Thought you would enjoy pics of my new 1000m BR/ F class rig. Based on a Stevens 200LA Gaillard palma contour BR match barrel (30") Rifle Basix trigger set at 6ozs Locally made barrel block Homemade stock. The block will get some milling and engraving work next.

Testing at 200yds with 139gr Lapua bullets has shown the rifle will shoot in the zero's. These bullets are used right out of the box and are simply awesome IF they shoot in your barrel. 1000m testing has been sub MOA. More tweaking should make this a competitive rig.

The 6.5 Mystic is my idea of a better mousetrap. Using the 308 as a parent case, the case is improved and shoulder forward to max out the case. Allows you to reach 2900fps with moderate pressures. 260AI tend to be very hard on brass to reach this velocity.

Another way to get some awesome performance from these actions.

Enjoy...

Jerry












Testing at 200yds.
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  #2  
Old 08-08-2006, 07:13 PM
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Re: 6.5 Mystic Rifle for 1000mBR/ F class Competitions

What is the weight of the rifle?
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Old 08-08-2006, 07:38 PM
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Re: 6.5 Mystic Rifle for 1000mBR/ F class Competitions

Your stock design is showing some serious good thought. I also use a barrel block, SGY. with cooling machined in. As to your 6.5's-08 that is also some great thought. How about a report on how she does on a calm day at 1K yards? Well done and be proud. Overbore [img]/ubbthreads/images/graemlins/smile.gif[/img]
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Old 08-08-2006, 10:45 PM
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Re: 6.5 Mystic Rifle for 1000mBR/ F class Competitions

Thanks for the kind comments. Will definitely be testing when weather cools down. Right now, I am shooting in the 85/90F with lots of mirage and wind. Nasty but still shooting very well at 200yds.

Went out again for one last group at this range. In boiling mirage, the first two made a figure 8. 'Thought' the wind was shifting and held off 1/2". Couldn't see the hole so shot another with the same hold.

Shots 3 and 4 cut the same hole 1/2" to the left. Oh well, got a lot to learn about doping mirage/wind. This is a shooter for sure.

On a bathroom scale, reads 18/19lbs. So will need a bit of a diet to make the 17lbs Willamsport class and a bit of ballast to make Canadian Open F class (22lbs).

Jerry
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Old 08-08-2006, 11:21 PM
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Re: 6.5 Mystic Rifle for 1000mBR/ F class Competitions

Very slick rig! Very Very!
On the cartridge...
Whats the neck length aka, how far is the shoulder pushed vs the 260?
How much capacity are you gaining?
Did you use a custom reamer, or an existing reamer run to a custom depth... neck reamed seperately ect?
Whats the checkered/ carbon fiber looking stuff on the gun?

I hope everybody thinks about this rig when they walk past its $300 brother in wally world [img]/ubbthreads/images/graemlins/smile.gif[/img] !!!
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Old 08-09-2006, 09:31 AM
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Re: 6.5 Mystic Rifle for 1000mBR/ F class Competitions

Very cool looking set up there except for that freakin' UGLY barrel nut. [img]/ubbthreads/images/graemlins/wink.gif[/img]

DK
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  #7  
Old 08-09-2006, 09:54 AM
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Re: 6.5 Mystic Rifle for 1000mBR/ F class Competitions

abinok, I don't have any 260 Win brass to compare as I make all of the Mystic brass from 308 Win.

However, I do have some Fed 243 brass so compared that for a rough idea. Using H335 and settling as much in as possible, the 243 case held 58gr. The Mystic holds 60.5gr.

Not very scientific but there is a gain at any rate. My orig estimate was 4 to 6gr of volume. Not huge but does keep pressures under control with the higher desired velocity. CCI BR2 Primers are just starting to flatten indicating pressures are still within safe levels.

Maybe you can work backwards from these dimensions: All measured with a hand caliper so expect a bit of error.

Base diameter just infront of the extractor grove: 0.470"
Shoulder Diameter: 0.460"
Case head to shoulder: 1.680"
Case length: 1.998"
Neck length: 0.230"

To save costs, I used a 6.5-308AI reamer (35deg shoulder). Came from MidwayUSA so a PT&G. Very nice reamer by the way. The reamer is run deeper to move the shoulder forward.

I then use a throater from Dave Manson Reamer to lengthen the throat to fit the bullet and load I want. In this case, the OAL is 2.9" with the lapua. The orig rifle was longer at 3.00".

I wanted to keep things a bit shorter this time just to see what would happen and for applications where feeding from a mag was desired. Plus, a bit more throat to burn out.

Obviously, powder compression happens at lower levels but this rifle likes it at 47.5gr anyways. I can stuff 49gr of H4831SC at the present setting (compressed load) so there is room if the rifle needed more powder.

Once I get more bullets, I will test Fed 210M primer and H4350. The CCI BR2 is quite a gentle primer so the Fed should get velocities up a bit for the same amount of powder. Will see if accuracy stays.

H4350 will definitely get pressures to peak within the given case volume. Will not be compressed either. This will give me a chance to see if there is the same accuracy at higher pressures/velocity.

LR testing hopefully will happen in the next few weeks. Supposed to start cooling off which is a relief. However, when will there be a calm day?

The carbon fibre design is vinyl used to put graphics on cars and bikes. You can find this and many other colours at your Pep Boys or similar auto store.

A very easy way to dress up your gear.

Thanks for the continued interest and kind comments.

The goal was to see what type of performance could be extracted from readily available stuff to keep cost down. I can say the project has been a success given the present 200yd groups.

For dies, I use a 260 Lee collet neck sizing die and a metal washer to act as a spacer. Works like a charm. Seating is done with the reg. 260 Lee seating die. All seems to work very well.

Jerry
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