Just the fact you are shooting 130 grains of loose Triple Se7en 2f (IMO) you are doing a couple things that could lead to disaster. Your powder charge is much greater then what is recommended in the manual of my CVA Staghorn. Perhaps your manual states different levels. Mine says 100 grains maximum of loose powder. Although the manual also states my rifle is able to shoot 150 grains of pellets, look at a Hodgdon's Powder site and you will discover the do not recommend anything more then 100 grains of powder.

130 grains of loose Triple Se7en with the 15% additional power level as compared to Pyrodex or Black Powder pushed that load somewhere near 149.5 grains of conventional powder in strength. Again, this is considered too much powder for that rifle in loose form.

My CVA Staghorn also has a size on the sabots you should use and I believe that is 300 grains. You're right on the edge of the table with some of those loads. So it would be interesting to learn just what kind of stress and barrel pressures a load like that is reaching. I am no engineer and do not have the mathmatical abilities to figure such a thing but it would be interesting if some one has that information.

I believe there was a report of a Kodiak blowing up a while back while loaded normally. Isn't the Kodiak and the Apex about the same thing? Anyway, what I am trying to say is, I'd be careful shooting those kind of loads.

I am glad the rifle is shooting well for you.