Tests were done using bench, sandbags, measuring tape, and chrony. I tested two of my favorite guns this morning before the heat and wind got up. First up was my RAW 1000X in .25 caliber using JSB 25.4 grain pellets set at a chronied 935 FPS and zeroed at 25 yards. After I shot the target and chronied the pellets I shot 3 shots at 100 yards waiting a couple of minutes between shots with a zero hold. Both these guns shoot better than I, and regularly shoot under 1 inch groups. I measured the group and it was under an inch and the center of the group was 14 inches below the dot I was holding on. Next was the old Air Ranger .22 50 FPE version also chronied at 935 FPS, zeroed at 25 yards, using JSB 25.4 pellets. After a quick check at 25 yards to make sure of the zero and chrony info I moved to 100 yards. I shot a 3 shot group waiting between shots trying to make the tests between the two guns equal. I measured the group, also under 1 inch, and the center of the group was 12 inches below the dot. These guns use the same scopes, mounts, etc and were set at 10 power for use with the mildots. I tried to make the tests as equal as possible. I will try to answer any questions and take suggestions anyone may have.
I suppose one would expect the .25 to have a better BC and therefore have less drop than the .22 but it appears he is saying the opposite. My only quick thought is that the scope height above the barrel could be a factor? Are they the same? It's tricky as the scope height is the center of the projected scope LOS above the barrel where the pellet exits ( I don't include the shroud, not sure if this is correct ).
Regards
John
Your results are as I would expect. Everything equal I would suspect the .22 to have slight edge over .25 with regards to bc. .22 being of same weight will be the longer pellet and I believe would lend towards the better bc. I would also think the .22 pellet would have deeper penetration. Note I said "suspect" as I really don't know the applied science here.
Cheer.
Edit due to spelling
Thanks for the comments. I was stating that in my test all things being equal, (pellet weight, starting muzzle velocity, scopes and scope mounts) the .22 had slightly (2 inches at 100 yards) less drop leading me to believe that the longer and equal weight .22 pellet had a slightly higher BC and less drop. I did the same test several years ago using identical pellet guns, scopes, scope mounts, and Crosman Premier 14.3 grain pellets in a .20 caliber vs .22 caliber. Only difference I did this test at 50 yards. The smaller but equal pellet weight .20 caliber had slightly less drop than the equal weight .22 caliber. I don't remember the exact measurements now but I do remember the .20 dropped less than the .22 just as the .22 dropped less than the .25 in the test today. Must mean the smaller diameter pellet with equal weight Has a higher BC and cuts through the wind better.
I believe you are correct, and that’s one of the main reasons many shooters miss the extra heavy Korean pellets (I want to say they were Dae Sung pellets?) in 20 & 22.
I have shot 22 and 25 PCPs for seven years now,
Just bought a Vulcan # 2 in 177 , Its got me saying wow hitting the target at 48 yards.
Just saying
Mike
Thanks for the "work". I would have thought it would have been the opposite. BUT, another post stated that the same test done with the .20 vs .22 also resulted in the smaller caliber doing better at distance. This brought back my thoughts from Doc Beeman heralding the .20 as the best at long range. After I FINALLY got a .20, looking at the long tail on it compared to the same weight in .22, I came to the conclusion that maybe Mr. Beeman was on to something here. My subsequent testing showed that Doc was right. Your testing shows the same.
The "advantage" of the .22 in the same weight, as shown, is the better BC and thus less drop.
The advantage of the larger diameter .25 is that (with "equal" guns) the efficiency will (if tuned correctly) be better, allowing for more shots on the same amount of air. This is due to the larger diameter surface area for the air to "push" on.
I have a range that I shoot at everyday. I shoot off the bench with sandbags. The reason I said the rifles are capable of out shooting me is some days I shoot all the pellets in the same hole, and with no adjustment to the rifle I go back the next day and can't seem to shoot as well, so I know it's me.
You ain't kidding. Out of ALL air guns I've ever owned, within reasonable airgun distances the .177's penetrate deepest & shoot the flattest with the right pellets. I always preferred 10.5 Ultra Mags, Eun Jin 16 grain, and at 75 yards I have no problem hitting quarter (coin) sized rocks everytime if I'm rested & know my speed & external ballistics. Not to hijack but the discussion on .22 VS .25 in BC, .177 pulls ahead I think in flattest shooting from 50 to 75 yards. Of course, heaviest carries most punch to target. The new JSB's needed this test now that .22's weigh as much as the Kings of .25.
One story to you real quick. AZ made a man a .177 laser of a rifle. 32ftlb Daystate Air Wolf spitting 16 grain Run Jin's into incredible groups at incredible distances. I don't remember what he said but both men loved the rifle & as I thought about it I wanted something akin to it. I wouldn't want a Daystate as I owned one and I just don't like the price tag. Great rifles otherwise. I'm saying I've seen cheaper (Evan, Marauders, etc.) rifles modded to shoot just as well as any 2K+ rifle.
A 32ftlb .177 of hard lead (Eun Jin's are perfect) at 50 yards & under? If accurate, that lead pill in anythings ear canal is a light switch off. Precise placement & not hitting ribs of any medium sized game would give PLENTY of penetration to vitals. Straight through vitals even. Good luck getting a Coyote within 50 yards though so heavier .25's & .22's are still best in my book for practicality. I hit a Crow once at 172 laser measured (after the fact) yards with a 25.43 grain King doing the magic 44.69 ftlbs, (860fps is it?) I remember the ftlbs not sure of speed. At 150 yards even 28ftlbs with 18.13 JSB only has about 8ft of drop. I regularly shoot my .22 anywhere from 32 to 200 yards set at 861fps with 18.13's & it's just plinking in the fields to see the drop & windage. It teaches you though many many things.
Great test & post. Much enjoyed & thank you.
Thanks James. After watching several of n2stuff's videos last night about the hmair in .172 caliber shooting slugs at incredible range (for airguns) it made a believer out of me. I have a .22 and a .25 MROD that I am thinking seriously about converting over to one of the hmair in .172 caliber.
