Crosman hollow probe build

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   I did try 15.89 grn pellets too, but the heavier pellets seem to hit a sweeter spot.
15.89 grn
12 pumps = 18.10 / 716
8 Pumps  = 14.86 / 649
4 pumps  =  9.46 / 516

What I really like is that this is a really good plinker too. A couple of pumps will give you enough power for quiet plinking.

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Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1676	Post Options Post Reply Quote Pauly5 Report Post Thanks(0) Quote Reply Posted: 16 May 2023 at 3:06am
	I did try 15.89 grn pellets too, but the heavier pellets seem to hit a sweeter spot. 15.89 grn 12 pumps = 18.10 / 716 8 Pumps = 14.86 / 649 4 pumps = 9.46 / 516 What I really like is that this is a really good plinker too. A couple of pumps will give you enough power for quiet plinking.

kruzaroad Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 03 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2691	Post Options Post Reply Quote kruzaroad Report Post Thanks(0) Quote Reply Posted: 16 May 2023 at 3:26am
	That's interesting I got 652fps average over 10shots which is 15fpe with hades 15.89gr out of box when first got 362.@8 pumps. Page 14 of you got to be out there to see,has all 10 chrono numbers.

J-S Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Senior Member Joined: 20 Oct 2014 Location: Auckland Status: Offline Posts: 497	Post Options Post Reply Quote J-S Report Post Thanks(0) Quote Reply Posted: 16 May 2023 at 8:45am
	Looking like a good project! 4 pumps for 9fpe is nice power!
	J S Airguns Air Arms TX200('s) Theoben Sirocco HW77 FWB 300s Webley Patriot One or two others... Current projects: Too many..

RangerPete Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 19 Apr 2023 Location: Cambridge. Status: Offline Posts: 1035	Post Options Post Reply Quote RangerPete Report Post Thanks(0) Quote Reply Posted: 26 May 2023 at 3:10pm
	Hi Paul, Have u noticed and skirt “reformation” with your beveled probe? Makes me wonder if it might be worth making a dedicated “pellet skirt reformer press”?!?! Something like a small press that holds the damaged pellet by the waist, and a beveled rod is carefully pressed into the skirt to re form it back to round. 🤔
	Walk quietly, but carry a big stick.

Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1676	Post Options Post Reply Quote Pauly5 Report Post Thanks(0) Quote Reply Posted: 26 May 2023 at 3:46pm
	Hi Pete, I did do some trials to see what sort of engagement was made on a good pellet, and I don't think that there is enough resistance from the barrel for the probe to push the pellet against. So while it won't straighten out a deformed skirt, it does look like it kind of seals inside the skirt. But it would be possible to make something that you drop the pellet into and push a probe into the rear of the pellet. I'm sure someone has tried it.

RangerPete Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 19 Apr 2023 Location: Cambridge. Status: Offline Posts: 1035	Post Options Post Reply Quote RangerPete Report Post Thanks(0) Quote Reply Posted: 26 May 2023 at 4:06pm
	Ja, what you say about the barrel not offering enough resistance to “grip” the pellet while the probe reforms a damaged skirt, makes perfect sence. I wonder if u can buy a mini press that would reform the skirt and at the same time swage a pellet. Maybe the ultra competitive competition guys have already come up with one to make sure every pellet is perfectly uniformly shaped and sized… Like powder burners who work out individual case volumes and weigh every case for uniformity, I’m sure a pellet swager/skirt uniformer would greatly increase the accuracy of any air gun.
	Walk quietly, but carry a big stick.

kruzaroad Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 03 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2691	Post Options Post Reply Quote kruzaroad Report Post Thanks(0) Quote Reply Posted: 27 May 2023 at 2:24am
	It's called eyes and a vernier+, scales, or sorting your pellets.

Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1676	Post Options Post Reply Quote Pauly5 Report Post Thanks(0) Quote Reply Posted: 27 May 2023 at 3:01am
	I guess sorting first, visually and weighing would be the first step, then deal with the damaged skirt ones, or use them for practice. I have a brass pellet sizer that I used to use when shooting FT, but I don't think i'm good enough for it to make a difference anyway. I have also washed pellets in the past, applying a couple drops of lubricant to a tins worth. To be honest, I never spent enough time at a bench validating if there was ever any benefit. Now I just check for bent skirts before loading. If I was target shooting I would pre-sort and weigh.

jwabfrog Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 13 Nov 2021 Location: Thames Status: Offline Posts: 159	Post Options Post Reply Quote jwabfrog Report Post Thanks(0) Quote Reply Posted: 27 May 2023 at 4:11am
	Tinbum sells pellet sizers - obviously only good for reducing pellet size. Link below https://www.airrifletuning.com/store/tbt-22-pellet-sizer/ I've also been interested in using lubricant but have never actually tried this - Napier sells prelubricated pellets which I think I might try as well as pellet lube: https://www.napieruk.com/products/power-pellets-22-target-tin-of-500-pellets https://www.trademe.co.nz/a/marketplace/sports/hunting-shooting/air-guns-parts/ammunition/listing/4147949924 https://www.napieruk.com/products/power-pellet-lube-10ml Lots of videos on youtube covering pellet cleaning and lubricating: https://www.youtube.com/watch?v=n9lNFKD3Q-0

kruzaroad Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 03 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2691	Post Options Post Reply Quote kruzaroad Report Post Thanks(0) Quote Reply Posted: 27 May 2023 at 4:36am
	Head sizing and weighing reduces Flyers. I have no dought on that from target shooting on farm.

jwabfrog Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 13 Nov 2021 Location: Thames Status: Offline Posts: 159	Post Options Post Reply Quote jwabfrog Report Post Thanks(0) Quote Reply Posted: 27 May 2023 at 5:01am
	PCP testing accuracy with damaged pellets: https://pneumaticdetonation.wordpress.com/2017/08/02/bent-pellet-skirts-and-accuracy/

kruzaroad Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 03 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2691	Post Options Post Reply Quote kruzaroad Report Post Thanks(0) Quote Reply Posted: 27 May 2023 at 5:09am
	Yep not for hunting. He's also using a pcp which may be firing at good fpe. I wouldn't go by that myself as I've spent the time shooting unsorted pellets verses sorted and never got that good result with damaged pellets. Each to thier own.

Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1676	Post Options Post Reply Quote Pauly5 Report Post Thanks(0) Quote Reply Posted: 27 May 2023 at 2:52pm
	I don't know, but I'm guessing the more powerful the pcp, the better chance of the instant blast of pressure opening up a bent skirt.

RangerPete Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 19 Apr 2023 Location: Cambridge. Status: Offline Posts: 1035	Post Options Post Reply Quote RangerPete Report Post Thanks(0) Quote Reply Posted: 27 May 2023 at 4:07pm
	That sounds reasonable Paul, that a stronger blast or air has more chance of opening up a skirt. What have you guys tried as pellet lube? I know there are commercially avalible little bottles, but are there any home remidys that are cheaper or more easily avalible? I saw one guy on u tube, Tinys rifle stocks or something, (he shoots some impressive groups so he’s probably worth listening to) using a bicycle chain wax which is in a liquid form and dries fairly quickly. I think another guy was suggesting automatic transmission fluid… do u think that would produce dieseling?
	Walk quietly, but carry a big stick.

RangerPete Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 19 Apr 2023 Location: Cambridge. Status: Offline Posts: 1035	Post Options Post Reply Quote RangerPete Report Post Thanks(0) Quote Reply Posted: 27 May 2023 at 4:22pm
	Jwabfrog, I have tried the Napier power pellet lube once a long time ago. Unfortunately I didn’t do a before and after test to see if it actually improved accuracy and velocity, I just bought it and used it, and the little air arms shot beautifully, so I just kept on always using 4 or 5 drops of the lube in every new tin of pellets and kept on blissfully shooting… I’d like to get some more and give it a good “scientific” test. I’ll also do the same using the bicycle chain wax.
	Walk quietly, but carry a big stick.