@JungleShooter.....
For everybody else, this came up in a recent discussion here on AGN....how much fpe loss do we typically see from slugs? Well, it depends. lol.
Gun is a Vet Long in .22 with a 23inch 6 groove polygonal LW with a 1:32 twist rate, choked. Yes, an RTI "LR" barrel that a friend cut for me to fit a Veteran.
Didn't do any tuning or tweaking for these #s, same reg pressure and hammer tension and hammer spring for all of them. (replaced orings in the reg recently and it's settled into a bit higher fpe than what it was the last time I shot it, about a week ago)
All five lubed with Gunzilla.
.22/25.4gr Monster RDs: 934.5, 928.7, 925.5 --> average of 929.6 = 48.75fpe
.218/22.5gr Varmint Knocker: 968.9, 974.1, 971.1 --> average of 971.4 = 47.16fpe
.218/24gr Varmint Knocker: 934.3, 937.5, 938.5 --> average of 936.8 = 46.78fpe
.218/26gr Varmint Knocker: 907.1, 912.8, 909.3 --> average of 909.7 = 47.79fpe
.218/28gr Varmint Knocker: 863.8, 872.6, 875 --> average of 870.5 = 47.13
Honestly VERY surprised at how little fpe is lost when using slugs versus pellets from this barrel. Typically, the difference is much larger. Couple things that may be at play here though....the bore on the LR barrel is VERY smooth.....it's a poly, but it's even smooth for a poly.......and the choke isn't obnoxiously tight.
Again, all the other times I've tried this (other guns or other barrels), the slugs cost multiple FPE versus the same "tune" with pellets.
The only "rule" that I've found slugs follow, is that they don't follow any of the "rules" that we read about on the forums, or personal preconceived notions, even when based on previous slug experiences.
Quite interesting, and thought you (and others) might think so as well.
(For anyone curious, the top three weights showed promise, even though they're going slower than most would say they should be shot, AND being shot through a choked barrel, AND being shot through a pretty slow twist rate. The 24grain were the most promising. Basing that on how they shot at 100 yards).