[diogolopes]

Hey there...

I own a WE Scar-L wich i use as a DMR.

It comes originally with a 350mm barrel, not sure about inner diameter, and a ported cilinder, and shot at an average of 440FPS with .20.

Installed a R-HOP onto it as i do for all my guns.

So far so good...

Problem is that i was experiencing terrible accurary and consistency issues at a range of 65 meters, which is my most common engagement distance when i play as DM.

I usually use either .30 or .36 BBs.

Don't know why, but i suspected i was under-volumed, them i replaced stock cylinder by a fully closed one, and also replaced the barrel by a 6.03 455mm one.

Problems persist!

One shot goes to the right, other goes to the left, one gets not enough hop and drop way before the target, other gets over-hoped and goes way beyond the target, it's terrible and completally unstrastable, mainly for DM purposes.

There are a few things that gets me suspecious:

1. FPS variation/inconsistency
2. Over-volume
3. Under-volume

Then, in order to gather some data for deeper analysis, i took measurements with several BB weights by using a xcortech chronograph, and also did some math and determined that i am at an 1.94 cylinder to barrel ratio.

I'll present cronograh data below and later i'll put a few questions:

PS: Just remembering that in Brazil FPS Limit for DMR is 450 FPS.

FPS VS JOULES

BB WEIGHT: .20

432 1.72J
436 1.76J
443.9 1.83J
439.2 1.79J
436.2 1.76J
441 1.80J
443 1.82J
441 1.81J
441 1.80J
439.5 1.79J
436.9 1.77J
443.7 1.82J
440.5 1.80J
442.1 1.81J
437.4 1.77J
441.8 1.81J
442.3 1.81J
447.7 1.83J
442.2 1.83J
442.1 1.81J
442.9 1.82J
443.9 1.83J
447.4 1.85J
442.6 1.81J
443.7 1.82J
445.8 1.84J
436.7 1.77J
442.3 1.71J
442.1 1.81J

BB WEIGHT: .28

374.1 1.81J
362.4 1.70J
371.7 1.79J
371.4 1.79J
374.7 1.82J
375.6 1.83J
373.8 1.81J
371.2 1.79J
374.5 1.82J
373.6 1.81J
373.4 1.81J
369 1.76J
364 1.72J
371.4 1.79J
374.9 1.82J
372.3 1.79J
374.1 1.81J
372.6 1.80J
372.6 1.80J
374.1 1.81J
375.3 1.82J

BB WEIGHT: .30

359 1.79J
351.8 1.72J
356.9 1.77J
359.1 1.79J
351 1.71J
354.5 1.74J
354.2 1.74J
353.3 1.73J
352.7 1.73J
356.3 1.76J
356.7 1.77J
358 1.78J
358.4 1.78J
355.7 1.76J
356.3 1.76J
354.2 1.74J
355.3 1.75J
357.9 1.78J
359.9 1.80J
356.2 1.76J
356.9 1.77J
354.2 1.74J
355.8 1.76J
354.8 1.75J
355.2 1.75J
355.3 1.75J
356.3 1.76J
358.4 1.78J
355 1.75J

BB WEIGHT: .36

326.4 1.78J
320.5 1.71J
327 1.78J
323.2 1.74J
324.7 1.76J
322.1 1.73J
324.8 1.76J
326.5 1.78J
322.6 1.74J
321.9 1.73J
322.9 1.74J
325.3 1.76J
327.4 1.79J
330.1 1.82J
327.1 1.78J
325 1.76J
323.9 1.75J
324.6 1.76J
322.5 1.73J
326.7 1.78J
326.1 1.77J
327.1 1.78J
327.7 1.79J
325.1 1.76J
323.4 1.74J
327 1.78J
323.9 1.75J
324.1 1.75J
322.2 1.73J
325.7 1.77J
323.9 1.75J

Now, the questions:

1. Do these readings sugest any FPS inconsistency capable of such a huge HOP variations or do these readings sugest it is a gun with stable FPS?

2. Do these readings sugest i am over-volumed once as BB weight increases joules keeps almost the same? I tried to increase BB weight untill the point where joules started to significantlly drop, which in theory would indicate i started to get under-volumed, but that didn't happend and do not have any heavier bb, so, would this mean i am still over-volumed even for .36s?

Any help would be appreciated.

If i forget any point above please let me know.

Also, if anyone has a different point of view or other lines of investigation i'd like to hear about it!