The official Mike Bellm's

Bellm TCs

TC Contender, G2, Encore/ProHunter Performance Center


From .300 H&H Mag rifle barrel

Before and after groups.

Larger group circled lower left is with the De-Resonator installed. Sub-inch 3-shot group to the right is without the De-Resonator.

This was a barrel I rechambered for Charlie, a factory blued barrel.

Sims Barrel De-Resonator installed

Charlie's Report

Afternoon Mike,
Just returned from wringing out the Sims allegedly small group inducer. Four hour and almost a 100 assorted rounds. Bottom line I think it is
a gimmick. If you will look at some of my targets the 300 H & H that you
rechambered actually opened up when the rubber doohickey was on the barrel.
It by the way is very capable of shooting one hole groups sandbagged at 100 yards if I do my part. The first three shots in a heated barrel and
going for record included two bullets in one slighter larger hole. Adding
the rubber... not only made my rifle look ugly it opened up the group. I
stuck to three shot groups because I figure guys want this for hunting and
three shots is all they will ever get. So I tried it on a 30 inch fluted VV
338 Galaxy barrel. It did not tighten groups but moved them two inches to
the left of point of it does do something with harmonics. I
tried it on the end of the barrel and next to the forend...with little
difference in accuracy. Putting on a 30-30 with a folding stock opened my
groups. On a 300 Win Mag with a folding stock no difference. If you have
another volunteer I would be very happy to send this thing to is
not something I want to pack around in the woods.
Hope this helps.
Regards Dr Charlie

And Another Similar Report

Sorry for the delay but deer hunting come first. I'm very disillusioned with the performance of my only TC rifle barrel with or without the deresonator. I therefor selected the most accurate barrel in my arsenal and proceded with testing. Tested was a Browning single shot with 26" octagon barrel in 6MM Rem Cal. The resuls are attached. Identical conditions were used in both sets of shots with cool down between shots. Results are attached and speak for them selves.


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