NCED reports the .177 CPL as being very consistent.
Has anyone measured the CPHs to the same level?
My brother used 10.5 grain Boxed Crosman Premier Heavies after I sold him one of my home tuned .177 Beeman R9s. That was years before I started measuring and weighing pellets, however they were very accurate from the R9 I sold him. Here is a 50 yard target my brother shot with the R9 & die lot marked and dated CP heavies..............
He was using his standard "powder burner 3 shot groups" when he first got the R9 but I figured that two 3 shot groups at one sitting was at least as good as one 5 shot "airgun group".
Anywhoo......my brother used the 10.5 grain Premiers for the first few years because he liked the way they would drive trough a tree squirrel at any angle if the poi was placed correctly. After one hunt my brother and I was cleaning squirrels taken and one particular squirrel was hit at the hip and the CPH drove long ways through the squirrel and was found rather mangled lodged in the base of the neck. Using the 10.5 grain pellet with a Maccari Tarantula spring (about 30 turns of .128 wire wound with a .540 nom ID) he would get about two seasons use before breaking (about 10,000 shots), however he did switch to the 7.9 grain boxed CPL because he found that the flatter trajectory of the faster pellet trumped the slightly better resistance to wind drift of the "heavies". After switching to the 7.9 grain CPLs he got about double the spring life using the same Maccari Tarantula spring (discontinued years ago), however the trade off was that he had to be more selective with shot placement because the CPL doesn't drive as deep as the CPH at similar FPE.
For quite a few years our die lot marked and dated boxed Crosman Premiers were simply lubed with Slick 50 One Lube, dropped into our pellet pouches, then shot without any other pellet tampering. If the CP dropped into the R9 leade sat visually at the proper height in the leade it was pushed home and shot. If the pellet dropped visually "too deep" into the leade it had an undersized head and was tossed out without shooting.
Anywhoo........my .177 Beeman R9 bought has a rather loose leade that allows "unsized/unmollested" 7.9 grain CPLs to be loaded and shot accurately. A while back I tried shooting supposedly 4.52mm JSB Exacts from the R9 almost all pellets fit the leade VERY loosely giving inconsistent accuracy so I reverted back to the boxed CPLs. A couple years ago I bought a new .177 HW95 and found that it had a considerably tighter leade than my R9. While still accurate, after a couple hundred shot practice session I had a sore loading finger because the CPLs were so tight in the leade. I started messing with sizing my CPL pellet heads to ease "sore loading finger sessions" and found that CPL heads sized to 4.48mm loaded "nicely snug" in the HW95 leade, however I sized some other CPLs so the heads were 4.50mm and found that they were accurate and "proper fitting in the leade" with both the looser leade R9 and tighter leade HW95.
The looser fitting Exacts weren't especially accurate from my .177 R9 so I sold the 9 tins I had and reverted back the hard lead CPLs. After buying the HW95 with the tighter leade I always wondered how the Exacts would shoot so a few months ago I bought a few tins of 8.4grain 4.52mm Air Arms domes and was pleased that they fit the HW95 leade well shot accurately upstairs at 18 yards, however I haven't tested them at longer distances yet due to the recent storms. Here is a 8.4 grain 4.52mm Air Arms Dome groups shot upstairs at 18 yards sitting on a bucket resting the HW95 on cross sticks.......
LOL......since I was only checing the grouping I used the same scope settings as I used with the sized CPLs (4.50mm heads) and was a bit surprised that both pellets gave the same windage.
Hummm......I'm pretty sure that the "left to right pellet spread" was due to the shooter swaying on the bucket, not the pellet.