Review of the Redesigned .177 JSB Monster pellet

December 2 2017 at 7:21 PM
Philip Hepler  (Login phepler)
YF12

Here's my unscientific review of the "Redesigned" .177 Monster pellet from JSB.
After waiting for months while my order of the new design Monster was on back order, I finally received a couple of tins and did a little comparison of the original vs. new design.

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I first weighed individual pellets from both designs. Similar to the original design pellet, only around 30% of the redesigned Monster pellets in the tin were actually 13.4 gr. Some were heavier or lighter give or take a tenth of a grain. That may not be a big deal, but just for consistency I only used 13.4 gr. from both the original and new design for this test.

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The change of pellet shape from old to new is obvious, but the skirt of the redesigned Monster looks identical to the original. The redesigned tin of pellets I sorted seemed a bit dirtier than the original design tin I sorted, as my fingers were dark gray by then end of handling 400 pellets one by one.

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Off to the sight in range! Weather was overcast with practically no wind and temperature around 54°. I'm testing these pellets with a non-regulated Gen 1 Marauder with a LW barrel, from a table with a bipod attached. I use this rifle for Hunter Field Target so it’s tuned to around 20 FPE. My scope is a UTG 12x, and I did not adjust or click my scope in any way during this test. I recorded the velocity of each shot of my groups shot at 55 yds. Before shooting each group of pellets I filled the gun to 2700 lbs. First I shot a small group at my 25 yd. zero with each type of pellet. As you can see, the original Monsters were on zero, and the new designed Monsters shot a bit lower- about 1/4" lower. I noticed the new design pellet fits a bit tighter in the breach than the original.

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At 55 yds I filled the rifle back up to 2700 lbs. for each group. I shot two, 10 round groups of each pellet design at 55 yds. As you can see, my best group from the original design pellet was slightly better at 7/8", but I had a couple of fliers that I can not explain. The redesigned Monster group was 1".

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The velocity from each group was similar and I didn't see a big difference there.

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So what are your thoughts? Which would you use?
Next step will be to test my grouping of original Monster vs. new Monsters in the wind.

Thanks for reading,
Philip Hepler
Member of the Tar Heel Air Gun Club- hosts of the 2018 AAFTA Field Target Nationals


    
This message has been edited by phepler on Dec 2, 2017 7:59 PM


 
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