10 mm load question

[Bacon buster]

I’m developing a load for my 10mm gen 3 Glock 20 sf. I e worked up to 9 gr of unique using 155 gr xtp. Crimp is .420-.421 and oal is 1.260-1.261. Chronograph at 1388 FPS from 8 feet. Inside of casing after firing looks good. It’s functioning good and I don’t think I’m pushing it too awful bad but I’d really like to hear from those that are more familiar with this type of combination. Casings show a little bulge but I understand that is common and normal with these chambers. Please advise

 

[BigBlue 94]

No comment or help on the load, but my G3 G20 also produces a slightly bulged case. The stock glock barrels have a very loose chamber.

 

[BigBore44]

Are they fully supported chambers? FYI, there are better powders out there than Unique for 10mm. Like 800X and BlueDot. But in the times we are in right now, I can understand using what you have that books as safe. Alliant lists 8.5gr Unique for a 155 Gold Dot. Doesn’t list Unique with other 155gr bullets. It also doesn’t say if it’s a max load or not. So basically, without my manuals in front of me, all I can tell you is Alliant’s website sucks. Unique can have severe pressure spikes. I’d be very leery of going over max with that powder especially.

 

[Bacon buster]

I don’t want to max out the load per say. Just wanted a good stout load for hogs. For reference Using 7.5 grains in my 40 s&w. With the same 155 xtp at 1237 FPS. Also for reference I have some underwood 165 jhp 10mm factory ammo rated at 1400 FPS that chronograph 1248 FPS. Powder availability is super slim. I have some hp-38 that I haven’t tried as I have been happy with unique. I did see some longshot the other day and I’ve heard it is a great pistol powder as well.

 

[Lennyjoe]

Older Generation Glock barrels are not fully supported, hence the “Glocksmiles”.

If that’s the only bullets you have to use them so be it but I prefer 180’ or 200’s for field carry. May give you better penetration on them hogs.

 

[TTv2]

Pictures would be nice. What you consider a "little bulge" may be a blowout waiting to happen to a more experienced set of eyes.

All I've heard in regards to Gen 3 and prior Glocks is the chamber support isn't good and the Gen 4's and later are better.

I agree with the post above, 155 is light for 10mm and hogs. For me, I load only 180 and 200 grain bullets for 10mm, the 200gr XTP's don't explode like the lighter bullets do at 10mm velocities, thus better penetration.

 

[Lennyjoe]

By referencing Hornady’s 10th edition manual, you’re slightly above their max powder load with Unique.

 

[Casefull]

You’re fine with that load. I’ve done quite a bit with unique in my G 20. The previous posts have good advice.