Hiya Everyone!

My good friend Warren posted a table-only comparison of the CP's vs. other pellets in the 14'ish grains region. I, personally, do not agree too much with SS's ballistic tables. Simply because they test one gun. In that sense they are valid as my tests or as any other person's tests. The other aspect is that they do not state explicitly what are the tenets of their tests, for example, My BC's are always higher than theirs, why? My GUESS is that they measure BC's over the 50-60 yards range, while I measure them in the region I use them, mainly around the 40 yards marker. Except for some selected instances, I try to avoid long range shots, after all that's why it's called HUNTING. JMHO.
For pest control, I will go further, but only to a point.

Anyway, I measured the Velocity (using a Pro-Chrono Digital) at 5 feet of the JSB Express (14.3 grs.) and the CP (14.3 grains) out of my 460, with the following results:
JSB X.- 828 fps
CP.- 814 fps.

V @ 40 yards:
JSB X.- 717 fps
CP.- 702 fps

This yields BC's of:
JSB X.- 0.035
CP.- 0.034

Given that the JSB X is much more accurate in my gun than the CP I choose the former pellet.

Again, these are results of ONE gun, they do not establish a rule, but they DO CONFIRM that springers usually perform at their best with the pellet that yields the most energy.

Tests were done with all 3 JSB's; Gamo Rockets; and Crosman Copperheads as well as CP's.

HTH



Un Abrazo!




H�ctor

Shot from the sitting FT position with the WGRS Peep sight and the modified front sight as described in another post.

Black dot is 3/4" across in diameter. Group measures less than 1 1/8" o-o; about 7/8" c-c:



It's dificult to aim at such a small dot with no optical aid. But the gun is light and points naturally and it's a joy to shoot like it is.

I need to get a better front sight installed, maybe a Williams FireSight, maybe a Lyman Globe front, so that small targets are easier to hit, I would only need a friend to get them to order the special Silhouette apertures from Brownell's ROFL!

Probably a more adjustable windage-correcting sight would also be nice. Problem would be a good sight that can stand the recoil. Dunno, we'll see.

Keep well!



Un Abrazo!




H�ctor

You really can't complain with that group. It's a pretty small target for peeps at 50m. If you can adjust windage a little your on the money. The new Panthers have a globe Tru-Glow front sight which works well with the WGRS. I've managed 3/4" at 30 yds and I am just thrilled.

Happy Canuck

Well done Hector,
that's good grouping at 50m,
you have good eyes and an accurate gun to match.
all the best,
David.

Hector:

no doubt your #'s are with your air guns' then why? the SS #'s cannot compete with your #'s. I am not talking about accuracy but FPS and FPE in these pellets

RWS 48 in .177 with JSB Exact @ 50 yards 8.33 gr. is 633 FPS

RWS 48 in .177 with CP lite @ 50 yards 7.90 gr. is 695 FPS

granted 8.33 - 7.90 gr. = a .43 difference in weight (JSB's are heavier in this test)

.22 Crosman Premiers 14.3 gr. are better than all others pellets (brands) in it's class and gr. at 50 yards in FPS and FPE

CP's win over all others in FPS and FPE, did not say accuracy, you do your part and the airgun and pellets does the other part

warren


and remember "it's 30% the gun and 70% the shooter"

JSB X's (Express) give higher MV and higher V@40 yards than the CP's.

At the muzzle, Energy is greater by 0.8 Ft-lbs. I.E. almost 4%.

If we look at terminal energy at my "strive to strike" distance of 25 yards, we have that the JSB X yields 18 1/2 ft-lbs and the CP falls to under 17 3/4 ft-lbs.

In both cases I get enough energy to do almost any airgun job I could care to tackle, but it is clear that the CP underperforms the JSB X by an observable margin.

When shooting heavy steel silhouettes at 45 yards, or when trying to dispatch poopy pigeons (hardy birds) at 50, this difference is not "theoretical" or "in paper"; it is very real.

I can reach the 85 yard marker with the same Energy as the UK shooters start at the muzle. The CP would shorten that distance by 5 yards.

Again, I am not trying to demean any pellet, just stating that EACH gun is different and we should NOT rely on other's tables. Ideally we should all have a Chrono to establish our own constants, parameters and BC's.



Un Abrazo!




H�ctor