50calty

Well, I am totally guessing here but I will give you a thought...

But, first your Triumph should shoot the XTP with about any load you want shoot to about 130 grains and have great accuracy...

But here is what I am thinking.... your new bone collector with the new sharp lands has built up a some plastic fouling in the grooves allowing the sabot to slip up the bore with out turning early in the bottom of the bore by the time it leaves the bore it is rotating but not fast enough to have good stabilization.

The easy way to get rid of plastic fouling is to remove the barrel from the rifle and flush boiling hot water down the bore... the water will melt the pastic of the lands and grooves - when you get down you will be able to look down the bore and see it hanging there. Then scrub the heck out of the bore to remove it... but at least now you will not slip over it....

I have write-up some where about doing this process if you might be interested let me know....

The method - get some JB's Bore paste and scrub the heck out of the bore with a bore mop or bore brush I really prefer the mop.

You can look down the clean bore now even drop a bore light in and it will look bright and clean - you just can not see the fouling.

The more you shoot the bore and smooth out the lands - the less plastic fouling you will get especially with the new ploymere sabots. Running the JB's will also polish and smooth the lands...

Good luck I hope you get the gun shooting the way I know a Triumph can shoot.