SUB MOA at 100 yards

[Sfttailrdr46]

Shooting sub MOA at 100 yards with an air rifle is like shooting a ten inch group at a thousand yards with a PB, sometimes it happens.  Nobody is sure why.  Most people call it luck.

To quote another member the more you practice the luckier you get

[Bryan Heimann]

I guess you shoot what you've got.  If you are barely sub-milk jug at 100 yards, fine.  Still a lot of fun holding over and waiting for the pellet to smack.  Or you could zero at 100, however you have to- might need a drooper and even some shims.  I think it matters for target practice.  The way the target looks though the glass, the way the higher magnification settings magnify your flaws, why not?  Pellets are so much cheaper than bullets...

[mbouchpcp]

forget using pellets and consider something like a Sinner from Holland, shooting 41 gr. bullets around 1050 fps.... basically .22LR target loads in an air rifle....
Bob

Has anyone found a source for the projectiles being used by Sinner?  Perhaps someone here is better than me when it comes to Google searches.

Best wishes

The other Mark B

[robertr]

 This will get you started. You will have to translate unless you know Dutch.
http://www.mauricedrummen.nl/webshop/contents/nl/d294.html

[K.O.]

will be in the future tryin to get 25-40g .224 to shoot well out of a home modded Marlin 883N 22" Barrel with cast and NAA 30g .224 out of a stock .25 wood stocked synrod... got  10# & 15# springs?

I love this modding and then trying to figure a good melt(alloy/hardness)(bet just tin and lead works good) for that pellet-barrel-speed

going to have to figure some Boolit modding jigs

and then try to listen to the barrel if I do not have harmonic probs...

The Marlin Barrels will want maybe the 225-37-fn modified a certain way, say the nose at a certain size, but first how do they drop from the mold...maybe the grooves between the Drive bands can be sanded deeper

 maybe some blue printing  the base and nose for consistency, leave the gas check, shorten it to reduce weight, or go plain base...

then there is thinking about why Marlin chose to leave the start of the rifling sharp... well with a proper size Boolit it will size it without fins...?

because it is a bunch of small lands (20) I pushed thru a .22lr that measured just past .224  and it came out .224, have  .2244 and  .239

lyman style lube sizer. ( at least that is how they are marked)... .239 might work with a Minie treatment...?

well anyways It will be fun to try to work out ways to prototype/tune/blueprint a round for it...

If I was spoiled I might just get a pocket optical comparator to help but seeing as I am not, a magnifying glass will have to work...

oh yea forgot the 22WMR chamber is long and bore size+ a hair or two, just might work well letting it hit with some speed or may have probs there...

lands are .015" deep and 014" wide by spec...

.5-.75 groups in decent conditions at 50 yards seems easily with in reach if all is synergistic... Better, well call on the Mojo ... 1" at 75-100

bc of a 30g .22 @ <950fps is about .144  I think

Heck just thinking of this stuff am starting to feel like a wildcatter..


Then I could name the next one the  .212 K.O. Beretta/Hakim fire ball... though its a 25 5/8" .22 lr barrel...

I just hope gun parts corp knows what they are looking for when they said rifling was in good condition since it is .01mm/.00039" (poly?)... If it stayed true to the Berreta rifling of the time...1950s... Pope thinking I like...


well heck it was a 20 dollar gamble... I thought it was a 1950s Anschutz .22 pellet barrel when I bought it

Here is a description of the Beretta .22lr barrel/rifle of the time he does not mention Bore but there is a link in another thread about barrels that leads to that info and it is 5.40mm/.212598...now that with the width between hills and some math will tell land width...I have a headache right now so will leave that for later...pay attention to the chamber.

http://www.smallarmsreview.com/display.article.cfm?idarticles=1957

so,
I need to come up with a boolit for the design of that barrel... fun... hope the barrel is in good shape...may make a nice ~26" pellet barrel...

fingers crossed for one holers...with my best effort of tuning the rounds to the barrels..

they got 1" at 50 with just grabin a box for the old Berreta... The challenge and dream of MOA...

[mobilehomer]

Mark B (the other) check this thread. http://www.gatewaytoairguns.org/GTA/index.php?topic=74915.msg713568#msg713568
Then try to contact Theobenrules. If anyone can help, he can.

[vanTeunenbroek]

Waking up an old thread..
Recently I was able to buy a theoben rapid from a Dutch 100mtr. Competitor
While I am nowhere near as accurate as the former owner of the rifle I have seen some signed target sheets from competitors with sub m.o.a. Groups at 100mtr. However most shoot their guns tethered to the bottle and indoors with external reg's
I have found the section regarding 100mtr. Airguns and 100mtr. Airgun scopes very informative
Mostly they shoot bigbore's so they can actually see the hits on the scorecard.. Hard to see a 5mm hole at 100 mtr. So no way to know your p.o.i. Without using a separate range scope makes it hard to adjust while shooting.
The thing that scares me the most is the glass these guys use on their rifles... Full on schmidt&bender & nightforce.. Just when thinking I'm getting somewhere there is always something new that I haven't considered before
Saving up for a real sope now...
Does anyone know what the topic starter bought in the end??
Really amazed about all the info available at the g.t.a.