Have you measured the velocity before and after?
Yes.
Shells were re-crimped.
This was some time ago, and included once fired hulls, and brand spanking new hulls that had not been factory loaded/
Factory components, such as Fiocchi nickle plated buckshot.
Factory used powders, wads, shot, primers...
Waxed paper hulls to the Compression formed to....
Just some fun stuff to do with , not anal or compulsive, instead a fun hobby that I did.
I had a Stan Baker Bore Diameter tool to measure barrels, and messed with fixed chokes, and was real interested in the differences of mfg barrels.
Winchester chokes do not get the respect they deserve. My testing confirmed that choke was well thought out and how the Win barrels were made from chamber to muzzle.
I cut apart new shells, looked at components and weighed powder charges , wads, shot, buffering material if they had them.
Took a small jewelers saw and cut pellets into to see the plating and to get a feel of hardness and compared to see the difference in antimony percentage made...
Brister called all this
Art & Science and he was correct.
I had the honor and pleasure to meet Brister and shoot with him. I met Stan Baker...
Just something to do for a break from what all I was doing.
Sometimes I was asked to test and evaluate, and not told what all I had, just test it, and keep notes.
My deal has always been to learn the correct basic fundamentals of shotgunning, pattern the gun and know what that gun likes at yardages for targets, and just shoot the durn thing.
My attitude was "If I can see it, I can fell it" and I was not the only one.
Not meaning to sound wrong, still just gimme a gun, some loads and I'll run with it.
I prefer slugs for serious use, and this comes from what I did and was exposed to in a hi risk setting.
Not many of you will have arrangements set up such and might have to shoot through one way mirrors, but I and mine did.
It is said one year when I was competing, I got a bit carried away, and shot over 50k shells in a years time.
It was normal for me to shoot 25-30k a year.
My fun and hobby times...consisted of days like-
I would have a pallet of Winchester/Western nine pellet 00 buck and pallet of Winchester /Western slugs, loadings many policed depts issued and shoot various guns, barrels, chokes and make notes.
Seriously, six police guns, exactly alike, with consecutive serial numbers, and they would vary in pattern and groups.
Brand spanking new guns to be issued and I got to play with them first.
I measured those guns with the Stan Baker tool. Oh the barrel might of said "Cyl bore" , trust me, those guns had some choke.
Hence another reason why I do not suggest whacking off a barrel and not having any choke.
I tested my share of these as well.
I had my share of non concentric chokes , and add improper gunsmithing to install chokes too I tested.
Me, I would just a soon stay with fixed chokes.
Still I did shoot guns to check POA/POI ,and pattern, and groups before barrel was sent to have screw in chokes installed, and check it with the same loads when it got back.
Some folks did a fine job, some did not and I could always tell when a kitchen table gunsmith had done one.
I have told more folks to not get screw in chokes than I have suggested they do so.
When I did, it was most often a barrel burst at the muzzle due to mud , and bought for a good price, if not given to them. Then b/t what all I had done, the experience of others,and the aftermarket screw in choke folks, we got a load to work for someone with loads.
There is some magic with a 21", 23" and 25" barrel. Hence the reason I always preferred the 20" barrels on "police" and "riot" shotguns.
There are a few barrels that were made, and one I know for sure still is, that is highly sought after, and I and others keep it a secret.
One member here, a friend of mine, waited a long time to get one, and now has more than one.
It does wonderful things with buckshot and slugs.
It is not a long barrel, it is a fixed choke...and that is all I or he, will share.
Find what a gun likes, have other choices to shoot the gun likes in case the favorite load is not available.
Then to heck what everyone else says , or uses. Use what works in your gun, and know how to run that gun.
This is not rocket science...