Is anyone familiar with the difference between the Tac-X and the TSX. I was wanting to try some out in my 500 A2, can't find the TSX but it looks like Midway has the Tac-X in stock. Was also wondering if anyone else has played around with these in the A2, Jeffery, or the like and has any load data or field reports.

Thanks in advance!

The length of the Tac-Z is greater than the TSX - 1.892" vs. 1.663".

I would be interested in trying this in my .500 a2 as well. What loads would you start at and what velocity would you expect from a .500 A2 ? Would Varget be the powder to use ?

You can expect to get 2400 fps with the 647 TAC in 500 A2, maybe a bit more if you're up to it.
On powders, most anything from H322 up through H4895, Rel 15, Varget, and 4320 ought to work. Enjoy the shooting.

The Tac-X is designed for the 50 BMG if I recall. I have shot a bunch of them out of my 50-70-750 at about 1000 fps but never really found an accurate load. The overall length would be what would worry me in a magazine rifle.

Matthew

The CZ is pretty roomy. I can load a 570g TSX out to 3.73 (OAL), but I've decided on 3.63 to keep load density up in my 500 Jeffery. Haven't tried them, but with a relatively fast powder (I use 103g of H4895) my gut feel is they should work. My rifle also has a 1 in 10" twist. Not sure about other magazine rifles.

My .A2 is on a Stiller .338 action it has plenty of room, so I shouldnt have an issue. Only issue I will run into is that mine is throated for standard A2 so I doubt I'll be able to take advantage of the mag length anyways. Any others using thes ein their A2's ?

PC,
Unless you have a box inside-length of over 4.2 inches,
better plan on using them single-shot fashion.
IIRC, the standard 500 A2 throat has 0.400" of
parallel-sided free-bore length.
Throat will not be an issue for you.
Only if you are loading the 750-grain A-Max to well over 4.50", like COAL of 4.750" or longer,
will throat be an issue.

quote:

Originally posted by RIP:
PC,
Unless you have a box inside-length of over 4.2 inches,
better plan on using them single-shot fashion.
IIRC, the standard 500 A2 throat has 0.400" of
parallel-sided free-bore length.
Throat will not be an issue for you.
Only if you are loading the 750-grain A-Max to well over 4.50", like COAL of 4.750" or longer,
will throat be an issue.

So RIP what is the longest you can load a 750 AMAX in a standard 500 A2 throat (forgetting mag box length).

I will check my A2 when I get it back from the smith, just having some fine tuning done to it.

PC,
Don't have notes or hardware at hand, but I have photobucket ...

Your mileage may vary, as the Hornady A-Max shape and length have varied some over the ages.

Here is what I was using during the last century/millenium, bullet in the center.
I have stocks of some newer 750-grain A-Max that are different:





By eyeball, it looks like even 4.750" COAL will fit in the standard 500 A2 throat.
Only about .375" length of the full-diameter bullet shaft is sticking out ahead of the the 500 A2 case mouth.
IIRC, I was using 4.756" COAL in a 500 A2 with throat that had been lengthened to about 0.588" long parallel-sided free-bore.
Only about .188" longer than standard 500 A2 PS-free-bore of 0.400".
That was unnecessary, but may have given some free-bore pressure let-off.

There is only so long that COAL can go and still have the entire neck gripping full-diameter bullet shaft with only the boat tail intruding on powder space.

That longer than standard throat did not hurt accuracy either.
It shot the 705-grain AAA Harlow (first bullet on the left in the first picture in this post) very accurately:



In summary, I am sure you can make COAL at least 4.550", and probably 4.750" will be fine,
with standard 500 A2 and the old bullet I was using.
You or I would have to check the latest make 750-grain A-Max by Hornady in a standard 500 A2 to see if this still applies
with the newest bullets.
They may be different now.
Your mileage may vary.

Two 500A2 rifles below, aka .510 JABs, due to squirreling around with throat only on the Ruger No. 1,
and the same throat plus a 5-degree shoulder angle change on the BRNO.

The rifle that shot the above target with a 5X Leupold scope is the Ruger No. 1 below, 3 shots into 0.170" at 100 yards.
It was chambered with a standard 500 A2 reamer and throat lengthened by about 3/16" (0.188") with a throating reamer.
It graduated to a 4-16X Sightron for 942-yard cow pasture shooting from a sit with the bipod shown, since it was so accurate.



IIRC, the 750-grain Hornady A-Max was doing about 2150 fps, and was sighted 3" high at 100 yards,
requiring a 5-mil holdover at 942 yards to be right on the cow patty, when the Kentucky windage was correct.