A non pellet/slug picky barrel is invaluable. Especially since finding our desired pellets any old time is next to impossible.
I have several great guns but can't always find the exact pellets/slugs they need to perform at their best.
A general rule of thumb is if a barrel shoots CPHP's well at 25-50 yards (hole in hole to 1/2") it will most likely shrink drastically with a softer lead JSB, AA, FX, other rebranded projectiles and do excellent further out.
As far as speed goes I'm going to say this. No pellets are as precise as ones flying at 560-575 in no winds. That's a 10m standard.
When trying for more power or less drop we usually want 880fps for pellets. But longer OAL& heavier options do require faster speeds or twists. Also contrary to belief a slug does NOT need to be going 950+ to be accurate or expand well . Look up Motorheads micro incised slugs similar to Lehigh Defense. Here's a calculator to play with & get some standards that might help. You need a micrometer or caliper to measure OD & OAL.
https://bergerbullets.com/twist-rate-calculator/ Here's what I get with less than ideal H&N .217" 27 grain slugs last night.
Factory spring, 115 gram no slap hammer, power wheel on ZERO, top hat .166" gapped 0.015" off spin lock to bottom of TH. Running tethered at 2100psi my chronograph let me know why I was hitting at 178 yards on 3.5 mils instead of the 7 I was told to use with a SWFA SS 16x by StrelokPro.
I thought I was sending them at
980-1020 but when pressure dropped from 2700 to 2100 I realized they were going out at 1140-1180fps.
I can't wait for my 32 grain .412" OAL .2170" RBT Griffin slugs and I am going to try some 44 grain 4S nose RHBT LDC .625 OAL .217" slugs once I find a 1:12 or faster twist 24-28" barrel. RHBT LDC is Rebated Hollow Boat Tail Low Density Core. And they are PHENOMENAL at expansion and long range accuracy. Literally firearms guys mouths are hanging open when they see what these Griffin & Varmint Knockers do. Tom Holland's .177's are awesome also but I only have my hot rod BSA Ultra/Scorpion to send them.
My LW Condor barrel is a 1:17.7 w/ a reduced smooth transition choke, threaded with an Emperor on the end. It's perfect for 68-100+ftlbs this rig can make & less back pressure. I rounded twist rate up to 1:18 I'm amazed at what it can do though calculator says unstable. Tell that to the dime sized 100 yard groups. I'm tethered mind you. I do want a 1:12 or faster.
I'll hand lap the new barrel the way I always do, not with a drill for God's sake. It must be done by feel and measuring, pushing slugs through often in between when prepping for next rouge. Well rouge you can polish with a drill and free spinning rod but actual lapping with
220-320-600 Wheeler scope ring or valve compounds can be very very bad. I'd start with 600 as your barrel isn't your rings. I'm wondering since I removed a tight spot, all tool marks, and really relieved that choke if that's the reason I saw 27 grain slugs at 1180. But this was in basement and they didn't crack sound barrier so my chronograph could be off. Saw 6 shots like that though, no errors and increased pressure on reg to 2300 to slow em to 1040. I'll make a quick video.
Check these out folks and if ANYONE knows where I can get a 1:12 or faster 24-28" .22 barrel (even the 1:8 5.45 Green Mountain as its a .220 and .218" are supposed to be doing great. I'd love a 7lb barrel!!! I have Machinists but if you have one and want to earn up to $300 holler.
What's not ideal is the chart doesn't let me use G1 or R4 for .22LR which is closer to anything in the charts other than calculating your actual BC from 12" out to 50 yards. I know this barrel would shoot the old hand swaged NSA 36 grain FB at 900fps & very well but nowhere as good as Griffins because they're quite a bit longer than all others. At 200 yards NSA Bulk are fine for Coyotes but he only has 28.5 I think now. If I'm going for superior accuracy it's Varmint Knockers or Griffins. The RBT shines past 200.
So original poster (OP) I don't know if any of this matters to you but LW liking faster/heavier? It all depends on the caliber, bhn (hardness of lead) twist rate is most important & how the barrel was rifled and broken in, polished or truly lapped to perfection (slugs should have no more than 0.001" engagement and more like 0.0005")
LW has been the main airgun barrel used forever; but since small bore PCP's can now do things never dreamed of 20 years ago I suggest you look at your options and a secret is pick one pellet or slug for one barrel. Have it matched if you don't know how.
Hope this helped & please, feel free to give me a green ball if it did help. I could have been shooting.
Edit: OP, this is an inside thing not meant for you so please forgive me for it but I feel it should be addressed, and since I asked if he still thinks I'm retarded just yesterday and he said yes, that's okay. I'm not "thin skinned" but he dam well needs to know someone else with PTSD might not be a pacifist like myself.
Odoyle thinks PTSD makes me "retarded" maybe I am. Was this post something useful Odoyle? I mean I'm not going to defend you when people don't like your posts and you text me asking me to "post something useful." I never saw one green ball from you chief. I clearly said the man found me after 10 years and paid me what was owed and $150.00 more, but then tells me & others I'm retarded. Otherwise he does what he says in deals no doubt. Just seems to be a jerk of a person or his humor isn't in harmony with most. And it's not a lie, I would never hang out with someone who is/was a owner of some of his businesses.
IDK if my IQ is still 127 or 80 after my stroke and admitted drinking and illicit substances but PTSD doesn't make a person retarded. And I am not drinking or on any drugs, not even Mary J.
This is related as
http://www.assessmentpsychology.com/iqclassifications.htm Now admittedly some people shouldn't play with HPA, projectiles, sharp objects, tools, etc. Seems lots of folks, even here don't believe anyone should have semi automatic anything. I am a precision shooter but I respect The Constitution and fun you have with your LCS-SK19 even if I don't want one.
People don't always do as they say and leave feedback for buying/selling/trading. I should have over 200 but I have a measly 35.
If this post helps anyone please just click on accuracy and write whatever you believe if it's positive as some abuse the accuracy rating and post anonymous negative feedback.
OP and Nervous trigger & are getting green balls right now from me, signed JD as always, as I don't do things I'm not proud of or feel I have to hide.