Speer Gold dot HP or Hornady Xtps?

[halfglocked]

 well thanks for the great input I am thinking of 155grainers,because of 1 velocity  and keep combined and if it has to be used hopefully  won't over penatrate  like the 180s and above .I am running  10 grs of long shot with CCI  large pistol primers, I'd did  try magnum pistol once with 8.7 grains of Longshot with 1 x fired starline brass and I wasn't  happy at all I had one total case seperation.So I won't do that again  out in my G20 SF .

[The_Shadow]

halfglocked, If you had a case separation using 8.7 grains of LongShot with a mag primer, you had a bad casing to start with.

Case inspections are a real part of handloading, and for the 10mm "pass through sizing" makes for a better case preparation and another chance for inspecting things.

Good luck with your project! 

[DM1906]

halfglocked, If you had a case separation using 8.7 grains of LongShot with a mag primer, you had a bad casing to start with.

Case inspections are a real part of handloading, and for the 10mm "pass through sizing" makes for a better case preparation and another chance for inspecting things.

Good luck with your project! 

This, without a doubt.

9.5 gr LS produces less than 35K with a Sierra JHP at 1.260". 8.7 gr is a powder-puff. Also, if magnum primers are doing anything, AT ALL, to "push it over the edge", you were already too far beyond the edge. Simply put, magnum primers are grossly overrated. A magnum primer used with ANY published load and ANY powder should be considered as nothing more than a fine-tuning tool with non-magnum powder loads, and recommended for slower powders in almost every case. At a time, not too long ago, I couldn't get reasonably priced standard primers, but could get plenty magnums. I reworked all my target loads, regardless of the cartridge and dozen or so powders used, with magnum primers. In most cases I ended up with the same charge. Those that required adjustment were still within the margin of error, at less than 5%, for the same feel, performance, velocities, and pressure indicators. All my defense and hunting loads get magnum primers from the start for a variety reasons (for another discussion). Ultimately, if you have magnum primers and want to use them, there is no additional risk. It's a myth. Just follow the fundamental handloader rules and do it right. No different than sourcing a new lot of powder or switching primer brands, which can, and often does, have a greater affect than what primer you use. If you aren't working up your loads with any component change, you should stick to store-bought ammo and forget about handloading.

Although, pass-through sizing without adequate inspection can hide defects. I've had situations that clearly illustrate it. One incident is posted in the "Weird case failure" thread.

[halfglocked]

 well thanks for the great input I am thinking of 155grainers,because of 1 velocity  and keep combined and if it has to be used hopefully  won't over penatrate  like the 180s and above .I am running  10 grs of long shot with CCI  large pistol primers, I'd did  try magnum pistol once with 8.7 grains of Longshot with 1 x fired starline brass and I wasn't  happy at all I had one total case seperation.So I won't do that again  out in my G20 SF .

[my_old_glock]

[Taterhead]

I've loaded and shot both 155 gr GDHPs and XTPs. I think the GDHPs are best in the low to mid 1300s. The XTPs mushroom smaller, but might retain weight better at 1400 fps and higher. The thing about XTPs is that they all basically make about the same shape and size of mushroom throughout the velocity range. It literally is shaped like a mushroom. The difference is that it will just flatten more with increased velocities. The GDHP expands into huge distinct petals, so it can more easily come apart at higher impact velocities.

I would not feel under gunned with either!