Question on loading for X-treme bullets

[cwall64]

I purchased a couple of boxes of 10/40-180 RNFP HPCB from x-treme and was wondering how far others backed down the starting load to workup when using the Heavy Plate Concave Base bullet?  I have no experience with any plated bullets, I have been exclusively using Hornady 180 grain HAPs for the 10mm.  I have several loads I like for BE-86, Longshot, and 800X with jackets bullets (all seem to be at or near max book values), but wanted to try out the x-treme ones.  I was just wondering if I should go more than 10% down since they are not jacketed.

[tommac919]

Have been running those exact heads for a while now... prob about 2k+.  .... as a general rule plated run between lead and fmj as good start point.. low end of fmj.  (TMK)
Most plated say don't run at speeds higher then about 1200 +/- as it can shear the plating. The plating on this head is a bit thicker and holds up well in higher speeds.

With those I run 10.4 of Bluedot and fine them very accurate.

[The_Shadow]

If you are wanting to use the BE-86 then 7.6 grains would be about where you would want to be to yield target rounds.  You might could push higher with those bullets and if you gun is set up for higher impulse loadings.

With Longshot and 800X 8.6 should be just under 1200 fps as a good target loading, but the bullet could probably take more.

[cwall64]

Guess I should have stated that I am using mainly in Glock 20 & 29, and velocities I was looking for are around 1200 fps out of the Hornady's in the Glock 20 (running a KKM barrel and 24 lbs RSA).  I was just wondering on the X-treme's as they sated that the "heavy plated" are good for higher velocities (up to 1500 fps) - wondering if a marketing thing or real claim - not that I want higher than 1200!

With the Hornady bullets loads have been BE-86 8.2 grains (average 1209 fps), Longshot 9.2 grains (average 1216 fps), and 800X 8.7 grains (average 1210 fps).

[The_Shadow]

You should be fine matching those charges if the bullet inside the casing is the same when seated.  Measure the length of each bullet style, then extrapolate how much bullet is inside, if they are close to the same as the Hornady or less you should be good to go.  The plated copper may have about the same or slightly less frictional bearing surface.

[tommac919]

I was just wondering on the X-treme's as they sated that the "heavy plated" are good for higher velocities (up to 1500 fps) - wondering if a marketing thing or real claim - not that I want higher than 1200!

With the 180gr hplated, I've had them up to 1300+ (est by others data) and they held up fine on the plating.  As to 1500 , that's a guess if it would , not to mention getting a 180 to that speed would be interesting  but not in my g20

[bjw0007]

When going plated, I use cast, fmj, or hp data, whichever is the lowest.  I then just work up to my target velocity.  Most of the time, plated seems to match fmj data rather than cast data velocity wise.

[cwall64]

I got a chance to try them out today, not bad and 5 cents less than the Hornady's.  I will say with the load I was using on paper and chronograph they were not as fast or as accurate as the Hornady HAPs.  I used the Accurate data for #9 for the Hornady XTP (HAP is same bullet) of 13.5 grains and OAL of 1.250, so the HAPs had a little more in the case than the X-Treme's did.  Average velocity for a 10 shot group on the HAPs was 1,298 fps and the X-Treme was 1,275 fps - I know that is kind of splitting hairs!!!  Although the Hornady 10 shot group (off bag at 10 yards through chrony) were all touching and cut out a nice hole level with bullseye and a tad to the right quadrant of the bullseye, whereas the X-Treme's sprayed a little to the right, still level, but none touching each other.  Now It was hot and I could have been getting tired (always do chronograph work and paper shooting first thing when I get to our property to try to avoid being tired).