Regulated .30
I have had a TJ’s .30 cal pellet barrel for awhile. I even sent it to get coated last time I had stuff done. I used a one piece bushing I made for .308 barrel and all I had to do is open it up .003″ for this barrel. I also have a 100 gr hammer from a .257 build where I was taking off 5 grams at a time for testing.
I decided to throw it in my first .308 frame that I ended up replacing so I could make it a side cocker. This frame has been a test piece for anything I don’t won’t to do on a good frame. I was the first frame I had striped to make sure they did it right. I also used it to convert a old collared frame to the new drop in spin lock. I chucked it up in my lathe in the 4 jaw chuck and bored in the recess. I will do my .25 and .257 when I brake them down for anodizing here some day.
Next experiment will be to remove all but .375″ of the scope rail and install a .750″ wide solid one. It will be slotted to fit over what’s left and also will run a 1.250″ ball end mill down it. It will fit on top of the frame perfect and cover the old slot. Then it will be converted to side cooker and both sides caped like I have done in the past.
So to test it threw it all together with a old .257 breech and used my .25 reg tank. I just removed the stem and put in a stem with a .375″ tophat to match the breech. My .25 tank is set at 1800 psi and shoots JSB’s in the mid 930’s for 100 shots.
So I put the stem in with no spacer and it had a gap of .215″. I figure I was going to need everything I had so I shot it. Well I was a little surprised when it was shooting 44 gr at 865 for and real consistent.
So I decided to drop in a spacer just for kicks to see what happens. The biggest spacer I had was .110″. So I topped off to 3000 psi and started shooting. I was really surprised when now it is shooting around 915 fps.
So now it’s running .105″ TH. So I dig through my spacers and stack 2 to come up with a .085″ TH gap. Now it is shooting around 905 fps with dips into 898 fps. These pellets are not very consistent and can vary 2 gr.
So now I fill up and do a shot string to see how many it will get. On shot 51 it came off the reg with a 888 fps shot and shot 50 was 900 fps. So I was thrilled but I think there is more in it if I make the reg chamber larger. I would like 60-70 shots around 880-890 fps.
These pellets don’t do good over 900 fps. I have a friend that converted his .22 evanix to .30 and he is shooting it at 875 fps and gets sub MOA at 100 yards with 44 gr. JSB’s and 70 gr custom boattail slugs.
So as time permits I will work on this and a .357 version also. Need to have options for EBR and maybe the .357 will be to my advantage.
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Yes it is the only tank I use for all the builds I do unless 53 ci is requested. They have discontinued the tank so it is getting harder to find. I just got 8 from a paintball store online. They made a new version and it is shaped like a egg.
62 CU IN?? As in a paintball tank? Ugh… I’m going to have to re-read a lot of posts!!
62 ci 3000 psi bottle.
I took it to a friends house today and shot some 74 gr .300″ boat tail slugs from a mold he has for his .30. Shoots slugs really good. I will be ordering the mold. I was shooting them straight out of the mold.
I was also shooting the .257 and .308 at small rocks at 400 yds.
Totally amazement !!!
is that a 52 (53?) cu in 3k tank, or a 4500?
sounds like you’ve really got that .30 coming along Doug! 😀
I need to give you a call.
Knife
I made a regular chamber for the .30 today. I have been using my .25 tank.
Made the chamber .250″ longer for more volume. It is now set at 1600 psi and shoots around 895-907 fps.
So I gained a few fps and dropped 200 psi on the reg. Now I should get 70-80 shots.
I think I can get the .357 to shoot 900 fps on 1800-1900 psi and get 40-50 140 fee shots.
I’m not sure on 100 yds yet. Need to give it another try. But it sure works great at 50 yds. I stuck some .223 shells in the card board for something to shoot at. First one I shot a nice group right next to it and finally hit it. The next 3 I hit the shell the first shot.
Beautiful results Doug!! That is really, really awesome!!
257420 tethered at around 3150 psi. I was shooting at 3000 psi also.
Got to love your .257’s Doug! What bullet were you shooting?
Mike
Went a the range today.
5 shots at 50 yds. Tried 100 yds but the wind picked up and was blowing them to the right. I shot a line with them.
Shot the .257 at 100 yds and got this 3 shot group as they called for all firing to stop.
The 110 o rings in that material I have yet to find unless you go to a manufacturer and buy 100 min.
Have you looked at The o-ring store.com?
110 90d Urethane O-ring
http://www.theoringstore.com/index.php?main_page=product_info&cPath=367_459_460&products_id=16240
Very nice work, I’m always blown away by the master pieces you turn out.
Thanks
The o rings they sell are not the same. They are the clear ones from china. The ones I use are white and turn a little yellow with age.
I have a few of them in different sizes but tend not to use them.
http://s14.postimg.org/4051xxby5/image.jpgLove what you did with the Breach here! First Class all the Way!!! You knocked it out of the park Doug!
This has completely change the AF platform to a true High Quality Precision shooting Instrument. AF needs to take a long hard look at this one! Hell, the whole AG World Does.
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The thing I’m interested in is the regulator. Did you use a spring or belleville washers? How many cc’s is the chamber, that thing is awesome I like how it balloons out to give you extra volume. Very Cool. You have some really great Ideas there.