Problem with TC Omega Z5 and Hornady FPB bullets
I'm having a problem with my TC Omega Z5 and Hornady FPB bullets with 150 grains of 777 powder.
My preferred load is the Hornady FPB bullets. My rifle has the Williams Firesight fiber-optic sites.
My problem is with my Williams Firesite. To site in the bullet/powder combination at 100 yards, I have to move the Williams firesite to the very top of the site. So to be sited in at 100 yards, I can't physically move my rear sight any higher/farther forward.
I have it tightened down as far forward as the set screw will allow. This bullet/powder combination was about 7 inches lower at 50 yards than the Hornady SST with the same powder measure.
Is there a higher rear fiber-optic site that I can use to site higher at 100 yards? Or is there a shim or anything I can put below the rear site to raise it, so I can raise my point of impact at 100 yards?
Is there anything else anyone can recommend? Our muzzleloader season is only open sites.
TC recommends that you use their super glide sabots. I use them and get superb accuracy and easy loading. I use 777 mag powder. You may try them as I have noticed a difference in elevation with different bullet sabot combo's.
Thompson's sabots are actually made by MMP. I think most companies actually use MMP sabots If you go on the MMP website, they have charts and will recommend the proper sabot for the bullet that you want to use.
What weight bullet are you using? maybe 150 grains is too much powder? I use the same rifle, and have shot 245gr Powerbelts and TC shockwaves at 100. No problems with the adjustibility of the sight with either. I only shoot 100 grains or 777, so that may be why??? Hornady SST and TC shockwaves are the same bullet just different colored tip from what I am told, so they should perform the same.
After this season I am going to get some Barnes bullets and loose powder and work up a load for this rifle, but for now I'll leave it as is.
My suggestion would be to lower the powder charge. Start somehere around 80 and work up from there. It may be that using so much powder is having a negative effect on the sabot. Check out the Hodgdon loading datafor suggested loads.
Hodgdon PDf file
Why not get a scope? Unless your state won't allow it but some states will let you put a 1x optic on it. Anyway, you should be able to get a shim under the rear sight. I've been thinking of what to use and was thinking a thin piece of packing plastic from toy packaging or something like that. Or maybe "bed" it with JB Weld. When I bedded down my scope mount on my Savage using JB Weld it raised in about 1mm. That may be all you need. If you do decide to go that route just coat your barrel and sight screws with silicone based lube so the JB Weld does not stick to them; only the sight. -John