SapperLohr

I just bought a Thompson Omega, and am having some problems sighting it in. At 25 and 50 yards, I am hitting the "X" in the Ten Ring. Once I move out to 100 yards, I am all over the place. I do not understand this. I am consistent in my powder, and am shooting 100 grains of tripple 7, and 223 grain powerbelts. Any advice?

Triple Se7en

Powerbelts are made to cater to CVA/Winchester bores. It sounds like too much gas is escaping around the bullet on takeoff... stabilizing it out to 50 yards... but not 100. You also need to try 110, 105, 95 or 90 grains. If using pellets, buy the 30 grainers to adjust your load better.

You can also try filling the bottom hollow cavity of the plastic base with Bore Butter. That may seal the gas better. Odds are though, you'll get better 100 yard groups shooting T/C-packaged sabot/bullets like the Shockwaves, Mag Express Sabots or the Cheapshots.

dvdegeorge

Get rid of the Powerbelts,and try some 250 gr.Hornady sst's or 250 gr.TC Shockwaves.If you do stick with PB's the heavier one tend to shoot better from the Omega(295 or 348)

txhunter58

I would start with about 85 grains of powder and go to at least 245, 295, or 348 gr. In my experience, powerbelts seem to like lower powder charges with 777. Mine shoots 348's and 90 grains the best. This is my elk load, so with 777, you will have plenty of power even if you drop down to 85 grains. Another option is to try pure lead conicals such as maxiballs, no excuse conicals, or buffalo bullets. You got some work ahead of you. There are no shortcuts.

MLKeith

I find my Omega likes 348gr. Powerbelts or 300gr. SSTs or almost anybody else sabot with bullets of around 300gr. I Elk hunt so I have not tried any lower weight bullets. I also only shoot 100gr. or less of most of the synthetics; I shoot 90gr. or less of 777. Am presently doing a comparison of Clean Shot (American Pioneer), Black Mag3, and 777. Check Graybeard site if you are interested. I expect to have results by next Thursday.

JimboHunter1

Try the 250 grain PTX sabots by T/C. My brother in law and I both shoot them out of our Encores and they fly awesome.

bugs11

I shot some 260 grain PB's and some 260 grain .451 Nosler Partition HG last Sunday. Both with 80 grains of 777. I was using a wooden fence post as a rest, so the groups weren't the tightest. But one can compare the two bullets realative accuracy. At 60 yards the Noslers produced 2"-3" groups, the PB's produced 5"-6" groups. At 100 yards the Nolsers produced 8"-10" groups, the PB's produced 12"-14" groups. The gun has a 1.5-4.5 scope on it. The PB's load nice and easy, but really aren't that accurate out of my gun. The Noslers loaded about medium, not real easy, but not real hard either.

On a side note, this was the first time I had shot the gun using a Sims recoil pad and it made a world of difference on the recoil.

Nim

SapperLohr get a box or two of TC Maxi-Balls and run them through the barrel,mine did the same thing it has some burrs in the barrel also and the sabots arnt hard enought to smooth them out. And check the screws that hold the receiver down, front one first snug then back one then make them tight {and make shure the barrel is centered in the receiver}but not overly tight the composet stocks a bit soft.for what it is worth my $.02 Nim