FX FX Impact M4 Compact in .25 shooting Hybrids

Have any of you tried sizing them down at all or just shooting the factory sizes? After shooting thousands of solid projectiles of different weights and lengths , I’ve found sizing makes a much bigger difference in accuracy than speed.
Yes, I always test them in .250 and .249 before moving on. Immediate speed jump in .249 but that’s about it. Now I have no problem getting a Hybrid to do pretty good out of a Superior standard .25 600mm at 935fps.
 
The reason I still have the 500mm Superior .25 lying around is because it’s the best damn .25 hunting pellet shooter I think I ever owned. I hunted squirrel with it for one season and anything out to 100 yards was dead. But twice that season I ran into coyotes. I boiler roomed both of them with a pellet but prefer to do it with a slug.

When you give up on getting that .25 compact to shoot slugs send me a PM. I’ll give you the Dr. Death pellet recipe for squirrels and hopefully your eternal love and happiness with that gun.
 
Sizing by means of pushing the slugs through a die. I use NOE sizing dies. The equipment to do the sizing is fairly inexpensive. A Lee hand press and a few dies will usually set you back a couple hundred dollars. The process is time consuming but once you get dialed in worth every penny. I’ve had poor performing hand cast slugs go from 3 plus inches at 50 yards down to less than 1/2 inch at the same yardage.

Your first step should be to slug your barrel and see what size it is. Lots of good info out there on that subject. I typically start at bore diameter then size down .0001 “and not much more than.0005” under size until I find the sweet spot. This works for pellets also.
Wow. That's quiet a bit of additional work to do to be honest. I was hoping for out of the box ready slugs... lol
 
The reason I still have the 500mm Superior .25 lying around is because it’s the best damn .25 hunting pellet shooter I think I ever owned. I hunted squirrel with it for one season and anything out to 100 yards was dead. But twice that season I ran into coyotes. I boiler roomed both of them with a pellet but prefer to do it with a slug.

When you give up on getting that .25 compact to shoot slugs send me a PM. I’ll give you the Dr. Death pellet recipe for squirrels and hopefully your eternal love and happiness with that gun.
That sounds like a plan. I have quiet a few slugs coming in today. I'll be testing them from 130bar to 150bar with the heavy liner than the STX superior liner. I have read that the Hybrids do well in the superior liner... but was recommended by Utah Airgun to use a heavy. I'll put the results here when I have them... it may even be a few weeks since I have 4 kids... 3 of them between the age of new born and 3 years old... lol