10mm 155gr Hornady XTP Load Test.

[DadSmith]

10mm 155gr Hornady XTP
10.6gr 800x
CCI 350 primers
COL: 1.580
Avg FPS @ 10': 1457
Energy @ 10': 730 ft-lbs
Brass is looking fine no pressure signs so I'm going to take it to 10.8gr.

I've been working up from 9.8gr, but thats boring to post lol. I like it when i get over 700 ft-lbs of energy then I start getting happy

 

[Sling10mm]

Well, do you still have your hands?

I've never tried 800X, but it looks like you can wring a lot out of it. I like Accurate #9, but I think it tops out around 1400 fps with a 155 gr. XTP.

 

[DadSmith]

10mm 155gr Hornady XTP
10.8gr 800x
CCI 350 primers
COL: 1.580
Avg FPS @ 10': 1448
Energy @ 10': 721 ft-lbs

For some reason this was slower than the 10.6gr

10mm 155gr Hornady XTP
11.0gr 800x
CCI 350 primers
COL: 1.580
Avg FPS @ 10': 1511
Energy @ 10': 785 ft-lbs

This is as far as I went. I developed the infamous Glock Smiles at 11gr 800x.

So out of all the loads tested I think I'm going to stick with the 10.6gr 800x load. Which isn't to bad with a factory Glock Barrel.

 

[VulpesForge]

10mm 155gr Hornady XTP
10.8gr 800x
CCI 350 primers
COL: 1.580
Avg FPS @ 10': 1448
Energy @ 10': 721 ft-lbs

For some reason this was slower than the 10.6gr

10mm 155gr Hornady XTP
11.0gr 800x
CCI 350 primers
COL: 1.580
Avg FPS @ 10': 1511
Energy @ 10': 785 ft-lbs

This is as far as I went. I developed the infamous Glock Smiles at 11gr 800x.

So out of all the loads tested I think I'm going to stick with the 10.6gr 800x load. Which isn't to bad with a factory Glock Barrel.

When you start getting to the tippy top, variances in speed/powder charge that don't correlate can sometimes be a sign of adverse pressure symptoms. Powder can do strange things when there's too much to burn fully and pressures can vary wildly. I'm not that well versed with this particular powder, but I would check those cases very thoroughly for pressure signs. Another thing to consider is 10mm case length is actually quite important and your variance in pressure could have to do with your trim length/seating depth if you aren't paying super close attention to them at the top end of the powder scale. What made you choose the 155gr xtp to develop a load for? My last truly experimental rounds were 135gr Noslers going roughly 1500 from a kkm glock 20 standard barrel Using power pistol and winchester large magnum primers. I might try to change a few things around and get them to the advertised 1600 on the Double Tap nuclear loads someday soon.

 

[DadSmith]

When you start getting to the tippy top, variances in speed/powder charge that don't correlate can sometimes be a sign of adverse pressure symptoms. Powder can do strange things when there's too much to burn fully and pressures can vary wildly. I'm not that well versed with this particular powder, but I would check those cases very thoroughly for pressure signs. Another thing to consider is 10mm case length is actually quite important and your variance in pressure could have to do with your trim length/seating depth if you aren't paying super close attention to them at the top end of the powder scale. What made you choose the 155gr xtp to develop a load for? My last truly experimental rounds were 135gr Noslers going roughly 1500 from a kkm glock 20 standard barrel Using power pistol and winchester large magnum primers. I might try to change a few things around and get them to the advertised 1600 on the Double Tap nuclear loads someday soon.

I'm testing what grain my pistol likes best accuracy wise. The 155gr XTP off a rest at 50 yards produced approximately 2.5" 5 shot groups. I've already done 200gr double tap WFNGC they were okay but spread out a little over 3" 5 shot groups at 50 yards off a rest.

My next test is 200gr XTP.

 

[VulpesForge]

I actually just got done reading your posts about that load. A man after my own heart chasing those norma loads! The XTP's seem to be pretty accurate for me as well, I haven't tested the accuracy that far on those 135gr Nosler, but I'm expecting them to be pretty solid. Impressive groups from a pistol at any rate. Glad to see more 10mm addicts here.