Author Topic: New NOE 225-39 FN (Read 3122 times))

Hobbyman2007 · « **on:** December 21, 2018, 03:56:32 PM »

Got a chance to cast a bunch today. I haven’t even had the time to measure or weigh them . I did notice during the casting session that the mold is etched as 225-37 fn . I was in a near panic until I cast a few for inspection . They are indeed the mold I ordered just labeled different . Can’t wait to test ,but it’s snowing and probably won’t until the end of the weekend .

rsterne · « **Reply #1 on:** December 21, 2018, 05:43:25 PM »

According to the NOE website, that bullet is supposed to be 39 gr. in PB (which you have) and 38 gr. in GC.... I have the GC version and it casts at 38.3 gr.... The bullet is a copy of the Lyman 225107.... I had some Lyman GC's given to me and they are 39.3 gr.... My NOE box and mould is also marked 37....

bob

Hobbyman2007 · « **Reply #2 on:** December 21, 2018, 06:51:43 PM »

Bob , have you tested them ? If so how well did they shoot?

rsterne · « **Reply #3 on:** December 21, 2018, 06:58:40 PM »

Yes, the Lymans are excellent, no reason the NOE copy shouldn't be as good.... The 225107 is kind of a "go to" bullet in .224 cal like the 257420 is in .257 cal....

Bob

Hobbyman2007 · « **Reply #4 on:** December 21, 2018, 07:51:28 PM »

Sweeeeeeeeeet. I bought it on a whim . Hopefully it will work in a 1:15” twist with a slight choke .

K.O. · « **Reply #5 on:** December 22, 2018, 05:36:34 AM »

I have the 225-37 cast a few did not weigh any tho... just wanted to push a few thru my small collection of 22lr/WMR/Hornet barrels...dug up 3 that I did not remelt and they are 36.9g to 37.2g... lee scale...

Mine is from the early drawing with a tapered gas check cast with 1.5 % tin... am hoping later to get about 650 fps with them out of the urban and a 23"-24" barrel...faster out of a Mrod and same barrel length .160 ish porting.... hope for at least 700 fps...

Then maybe with a 15lb spring and 1:14 24" hornet could get the 50g Bator to 700 fps...ish

Right now did a chrony run stock out of the box the Urban is sending the .217 BBT 30g out at 24.9 to 25.7 fpe around 2600 psi...

the 25.4 monsters I sent first at ~2900 psi and averaged 24.5 fpe checked the JSB 15.89 at ~2200 and got an average of 24.9 fpe for five shots... I think the barrel under the can is 15.5 inches...

which barrel is 15 twist in .22..? my Beretta barrel was advertised( in the 50s-60s) as 15.75 twist...

Hobbyman2007 · « **Reply #6 on:** December 22, 2018, 06:59:10 AM »

The barrel is in an Evanix K550 , don’t quote me on the twist rate as it was a rough measurement .

K.O. · « **Reply #7 on:** December 22, 2018, 08:14:32 AM »

Did some homework...Did you get the BBT to drop large enough... did you slug the breech and choke..?

https://www.gatewaytoairguns.org/GTA/index.php?topic=143416.0

did you pick up the .223-39 rn I think I want to deck mine and bring the heel length down to about .105"- .110"-.115" from .125" ...then eventually send it to hollow point services... do not need so much heel since no seating in a case... but yep something in me wants the little bit of velocity that being 4g-5g lighter will bring in a more sedate rifle... also it would bring both the Cg and Cp forwards... could just try setting up a jig to cut the nose some to about .250"..

right now it is patience needed have more ideas than $...

Hobbyman2007 · « **Reply #8 on:** December 22, 2018, 02:51:00 PM »

KO,

My barrel slugs at .221 at the breech and .220 at the choke . The bbt’s are at .220” so same as the choke . They do shoot pretty good out to 50 yards at just over an inch . These new bullets are dropping at .225 right on the money so I’m having to size them down in two steps , .223 then to 221 . Hopefully they shoot well ,today is not the day as it’s extremely windy .

rsterne · « **Reply #9 on:** December 22, 2018, 06:13:04 PM »

Kirby, FYI, removing half the gas check stub from the 39 RN heeled .22LR bullet to make it similar in length to a GC stub would lighten it about 5.5 gr.... LOA would be just under 0.400" for the HP version.... and about 0.430" for the RN.... It would make about a 2" difference to the minimum twist rate.... Shortened that much, it should be fine in an 18" twist below about 1000 fps....

I have that bullet mould (with HP), and the only thing that concerns me is that with the long nose, the bearing area in the rifling is very short.... only about half a caliber.... Removing half the base won't make any difference in that, of course.... because the heeled base is less than the land diameter anyways.... The heeled base, located within a .22LR casing, would normally keep the bullet straight when chambered, something our airguns won't do.... I haven't cast any yet, so I don't know if my concerns are valid or not....

Bob

K.O. · « **Reply #10 on:** December 23, 2018, 03:23:30 AM »

How hot are you pouring the .220 BBT... I poured mine pretty hot and I got .2205-.221 on the band and a few that were near .221/.219 band/nose this was the 222/220 mold... not the .219/.217 that fell a little small also when poured hot... even at not so hot (780*-790*) they are falling just a teenie bit small... need to find out how cool I can run the mold and melt and see how they Drop then... only did the one practice run with the 222/220.... just ran out of the .217 ran at 1.5 tin and 790* they are perfect in a disco barrel... need sized down for the tight Max Barrel

Might try running hot with pure lead and see how small I can get them to drop for that barrel...

Bob I do have the one jug hollow pointed ( Al ) but the other is not eventually want both hollow pointed... yeah I do like it at about .110 long for it's counter balance effect on the round that will be coming out of the full nosed jug...

The .223-39 rn should do well in .220 groove and tighter barrels with(my estimate) ~.195 contact patch at .220 a bit more depending on rifling height / how tight a bore...

I think in my marlin barrel .220 groove/ .2185 bore it will be fine with the counter weight...

lotta old barrels tended to run tight about like the Shilen .22 barrels at .2215 groove...

Sammi is .222/.217 if I remember right... reality.......... it is all over...

so the advantage is might be able to take heel all the way down to gas check length in a .219/217 barrel especially if it is choked...

But yep that is just thinking about it as drawn cause I have not cast with it yet and do not know how true it will drop...

K.O. · « **Reply #11 on:** December 23, 2018, 05:29:16 AM »

These 225-39 will certainly launch well I bet... no in barrel wobbly danger as a plain base...

Hobbyman2007 · « **Reply #12 on:** December 23, 2018, 07:45:17 AM »

Ran a sting through the K550 and I think they are a bit oversized at .221” . With an average speed of 760 fps for just over 50 ft/lbs energy . This rifle I should usually a 55 ft/lb . I’ll size the next batch at .220” and see if I can gain some speed . I was impressed with the K550 and these at 42 shots with an Es of only 26 fps .

rsterne · « **Reply #13 on:** December 23, 2018, 02:17:31 PM »

Kirby, removing only 0.015" from the heel will only lighten the bullet by about 1.3 gr....

Bob

K.O. · « **Reply #14 on:** December 23, 2018, 04:34:11 PM »

Sweet Shootin iron there Dennis...about 3% es should be good for near no stringing at 100 yards and minimize any differences in barrel harmonics... gives ya one part of the accuracy equation..

are you running a lube... I feel may be more needed in a choked barrel... just one of my gut feelings...

I wonder sometimes that with air rifles having no hot wash like powder can have enough build up from wax based lubes to avoid wax lubes...need to get a tub of the to try Hornady case lube looked like it might of helped 30g BBT out of a BSA barrel... MSDS says Tallow/mink oil based...

Yep Bob that is why I was bringing up that I could make a jig to cut off the nose some probably about .017 or so... that would leave .250 forwards of the grease groove... probably approaching a 70% meplat... then could go with a .8-.9 heel..? OAl would be about .402 ... rough estimated pic below...

leaving less to need to counter balance would mean able to shorten the heel more and between the two...just trying to maintain sort of a balance between heel and nose... keep an aero balance (70% or less meplat) while bringing down the weight to about 35 g...if the Cg and Cp move a little more forwards of the drag at the drive band /grease groove I like that also...feel it may be just a bit more aerodynamically stable that way... My gut also says it might have a very slightly shorter CG/CP lever which means a touch less overturning moment... do not have the software to check tho..

K.O. · « **Reply #15 on:** December 23, 2018, 05:24:40 PM »

I think it might be enough counterbalance left with a .08 heel with the hollowpointed jug...

?

I think if I was running the 225-39 FN as a plain base instead of the gas checked version I would deck the base to between 2/3-3/4 of what it is...

Hobbyman2007 · « **Reply #16 on:** December 23, 2018, 08:00:14 PM »

Thanks Kirby , I use 10w synthetic shock oil for lube and have been for a while thanks to the heads up from Knifemaker . The stuff really stinks but does wonders for having to clean my barrel less often .

KnifeMaker · « **Reply #17 on:** December 24, 2018, 04:00:19 AM »

Denis, when you say stinks, are you taking about aroma? Reason I ask, the Lucas brand I am using seems to my nose to have no aroma at all. Just neutral.

I am seeing swirling of my bullets when shot against a dark background in bright light. GRRRR!!! Yet accuracy is good. Can't be good for BC though.

Mike

Hobbyman2007 · « **Reply #18 on:** December 24, 2018, 09:07:44 AM »

Quote from: KnifeMaker on December 24, 2018, 04:00:19 AM

Denis, when you say stinks, are you taking about aroma? Reason I ask, the Lucas brand I am using seems to my nose to have no aroma at all. Just neutral.

I am seeing swirling of my bullets when shot against a dark background in bright light. GRRRR!!! Yet accuracy is good. Can't be good for BC though.

Mike

Ya Mike the smell of the stuff is like old differential oil . The swirling is probably due to such a short bullet , maybe the twist rate is a little fast . That’s really to bad , I had high hopes for a short 257 bullet . I think I’ll try to find some Lucas brand oil , I’m using the “cheap” stuff .

rsterne · « **Reply #19 on:** December 24, 2018, 01:55:58 PM »

Mike, can you post a sketch of the bullet you are seeing wobbling or spiralling, with dimensions.... and also post the twist rate.... I would like to run it through the Kolbe Twist Calculator and see what the SF is.... It is likely becoming Dynamically Unstable downrange as it slows....

Bob

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New NOE 225-39 FN

Author Topic: New NOE 225-39 FN (Read 3122 times))