New NOE 225-39 FN

[K.O.]

I am wondering about the choke and the long contact patch of the base...  thinking sizing under and knurling might be just the ticket..? along with minimal tin in the melt..?

[KnifeMaker]

I am wondering about the choke and the long contact patch of the base...  thinking sizing under and knurling might be just the ticket..? along with minimal tin in the melt..?

Yep, chokes can be a pita in slug guns! None of mine have chokes. the nose on the NOE gets more contact area than the rest of the bullet. Quite a bit actually.


Mike

[K.O.]

I do also wonder if sometimes a thicker tallow type lube would be better in a choked barrel... I do not think that silicone is a good soft metal to hard metal lube... in a non choked barrel not much lubrication is needed... with the choke a harder lube will be more effective because it will not be as displaced as the silicone... so yeah lube type may be worth a look also..?

[KnifeMaker]

Mr Bob, do you think that going to a 1-17 would help if I can't find a 1-20 twist?


I could size the bullets down and test them in the T/D. Just have to change the barrel. It is a bbl. I've had for years. No doubt it is still choked. It is 24 inches, so would have to loose 2 inches to go into the RS. (The breach slide area on Airforce guns) + the choke area. Shorter than I really want. 



Mike

[K.O.]

 I will not put out words other than mine but some what over spun is better than under spun..

 Being slightly over spun sometimes will work well till long distances and steeper angles of drop... So in my opinion yeah 1 :17 is good...

Being way over spun well any imbalance in the round gets it wobbling... that just gets worse with increasing drop angle...less spin less wobble... and more ability to nose over and less flying nose up as the round drops...

[KnifeMaker]

Thanks Kirby. To answer your earlier question, yes, I have tried different mixes in the lead. Settled on 1 to no more than 2% tin to pure.


Mike

[rsterne]

Mike, going to a 17.7" twist in an LW barrel would probably exhibit less tendency to wobble than your 14".... Either way, it's still a pretty short bullet in .25 cal, so you don't need to spin it that fast.... I agree with Kirby, too fast is better than too slow.... better a bit of wobble downrange than tumbling....

Bob

[KnifeMaker]

thank You bob!


I was shocked at how much better the TJ barrel shot the cast NOE .25 pellets. Much more accurate and predictable in the Rainstorm than from its factory barrel. Oddly, both are 1-14 twist. Even odder, the NOE's out shot the JSB's in the TJ barrel, while the factory barrel was a real shooter with the JSB's.


Just goes to show, you really never know what a barrel is going to like.


Mike

[Hobbyman2007]

thank You bob!


I was shocked at how much better the TJ barrel shot the cast NOE .25 pellets. Much more accurate and predictable in the Rainstorm than from its factory barrel. Oddly, both are 1-14 twist. Even odder, the NOE's out shot the JSB's in the TJ barrel, while the factory barrel was a real shooter with the JSB's.


Just goes to show, you really never know what a barrel is going to like.


Mike

Now that is exactly how I’ve been feelin . I’m gonna have to get a .25 mold ,just hope the Evanix barrel likes them .

[Sbak]

Just curious, I have yet to see a case where an airgun bullet is underspun. Any examples of bullet+barrel combo that didn't stabilize at useable velocities?

[K.O.]

I tend to think that the K550 is designed to send large head Eun Jin... does it do well with the Kodiacs..? I do not think it is the choke it is the 24" barrel/diameter + choke... it needs less fpe loss for sure... force loss at the choke needs to be closer to that of an Eunjin 28g...Should calm the barrel some and tighten thing up some...


Ditch the shroud and put a toilet plunger on the barrel..? Limbsaver of course...Might tighten things up...

https://limbsaver.com/collections/firearms-products/products/sharpshooter-x-ring-barrel-dampener...

[K.O.]

Just curious, I have yet to see a case where an airgun bullet is underspun. Any examples of bullet+barrel combo that didn't stabilize at useable velocities?

 

well there have been only a few folk down at .22 where a lee 225-55- rf might be to long for a 1:16 twist... and I think most that have tried .22 have gone with the .22 Hornet barrel... not .22lr...

[KnifeMaker]

Denis, I ordered some some Imperial Sizing wax. It came highly recommended by RoachCreek.


You simply rub some on your fingers and slide the bullets thry your fingers when feeding them into the sizing dies.


Now that I have an upside down sizing press, I use a bent Q-Tip to paint the inside of the sizing ring. Just a quick dip does it for about 30 bullets at a time.


The Wax really cuts down on smearing. Even worked with no sizing from 260 down to .249. Which is supposed to be impossible.  With no smearing what so ever. I also polished the inside of the die to a mirror polish suent pure green chrome polish. (Used in the Custom Knife industry for the final, cloudless/spotless finish).


The bullets come out as if polished on the driving bands.   they look down right pretty!