Pellet Testing

Re: JSB Exact Diabolo 10..34 Gr. – 177 cal

I've been using a Red Wolf , specifically configured for field target use, and while it only has three settings – Low, Medium, and High – I conduct pellet testing at each power to determine which works best for me.

I'm committed to multiple rounds of testing to ensure that any promising results are not just due to luck. Once a pellet shows potential, I try it again a few days later to confirm its consistency.

Usually, I shoot 10-shot groups at 25 yards which is the limit of my backyard range. Each 10-shot group is tested on the Low, Medium, and High power settings, and I record the data for future reference. When time permits, I take a curated selection to the indoor range for additional testing at 50 yards.

Over the weekend, I experimented with various pellets in the 10-grain range. While using the High power setting, I noticed that one particular shot group, the JSB Diabolo 10.34 grain, produced an extremely tight 10-shot group, with shots landing almost on top of one another. Although not technically a single hole, it was close enough for government work as they say.

Later in the session I decided to go back and add additional shots to the same group hust to see if it was luck or something else. After 40 shots in the same hole, the grouping remained consistently tight. The initial results were enough to convince me that this could be an excellent choice for field target shooting, which I already knew, but always looking for that confirmation.

I couldn't help but wonder if the outcome was merely a fluke. To ease my doubts, I repeated the test Monday morning, 30-shot group with the same results. Now… we’ll have to see how well all of that holds up at the 50 yd. range.

SIDE NOTE: In a different series of tests, I used the JSB Premium Diabolo match pellet, 8.44 grain, and observed some surprising results that I plan to post in a separate post.

Conclusion – Now I need a shooter as good as the gun, lol.

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Have you tried the AEA or JTS pellets?

Yes—both were tested in this platform, and I’ve had good results with each.
The JTS, in particular, has proven consistent enough that I run it exclusively in one of my .177 caliber pistols.

What stood out in this specific session, however, was the performance of the JSB.
Under the conditions of that day—25 yards, outdoor range, with all the environmental variables in play—it delivered results I did not anticipate.
The critical takeaway is that accuracy data is always context-dependent: this gun, this barrel, this lot number, this test protocol, at this distance, under these exact conditions.

I fully expect that repeating this test at 50 yards in a controlled indoor range—eliminating wind and other atmospheric factors—could produce an entirely different ranking. That’s why I consider this part of a larger testing matrix.
The goal is to gather enough comparative data to select the optimal pellet for the intended discipline - in this case, field target competition where precision and repeatability under match conditions are paramount.

Once a top-performing pellet is identified, I treat it as a control round for ongoing evaluation.
Any new pellet is tested against this benchmark, and periodically I will re-test older options to confirm the results remain valid.

At present, the platform’s inherent mechanical accuracy, and shot-to-shot consistency are high enough that any deviation in results is far more likely due to shooter input than the hardware itself.