2 10mm questions

[Edg]

Firstly i just ordered 1000 new starline 10mm brass, do i need to size it before the first loading?
Secondly im trying to load to near underwood FPS, all the load data is coming up about 100 fps less then they are getting, are they going over max load or is there another trick. Ill be loading the nosler 150gr. Ive read they use 800x powder, but the max load for that is listed at 1400fps, underwood advertises 1500fps and my chrono backs that up? Any advise before i break some of theirs down and weigh the charge?

[Gunsnwater]

How would you know what powder they are using by sight? Not likely they are used red dot, ble dot or green dot. No you don't need to size new brass. They have powder options you don't.

[SteveWag]

Have you compared some of the factory loads with your hand loads using a chronograph?
Steve

[gghbi]

Firstly i just ordered 1000 new starline 10mm brass, do i need to size it before the first loading?
Secondly im trying to load to near underwood FPS, all the load data is coming up about 100 fps less then they are getting, are they going over max load or is there another trick. Ill be loading the nosler 150gr. Ive read they use 800x powder, but the max load for that is listed at 1400fps, underwood advertises 1500fps and my chrono backs that up? Any advise before i break some of theirs down and weigh the charge?

I don't know your loading experience, but starting out with a max or max plus load is not a good idea. Start with a load that is not max, and work your way up to see where you are at. Check for pressure signs and closely inspect fired brass. Do I remember hearing that starline brass is good, but soft? Not sure on that one.

Let us know how it checks out as you go.

[noylj]

>Firstly i just ordered 1000 new starline 10mm brass, do i need to size it before the first loading?

Do you wash plates and glasses after you buy them or do you assume they are clean?
Remember, they have been tossed into bins and tossed into boxes and weighed and poured into boxes.
So, how much trouble is it to size them to ensure they will chamber?
I always size cases before loading, virgin or used.

>Secondly im trying to load to near underwood FPS, all the load data is coming up about 100 fps less then they are getting, are they going over max load or is there another trick. Ill be loading the nosler 150gr. Ive read they use 800x powder, but the max load for that is listed at 1400fps, underwood advertises 1500fps and my chrono backs that up? Any advise before i break some of theirs down and weigh the charge?

Why? If you want a magnum, there are better options.
You may have READ they use 800X, but they may also be using a non-cannister grade of 800X or some other entirely different powder that you can't buy. Then, a max load in a manual only means that it was a max load with the exact lot number of bullets, cases, primers, and powder they used, at the COL they used, using the gun they used. That load will almost certainly be over- or under-max in your gun with your components. You don't even know if the Underwood load is actually battering your gun and will cause problems over time.
For 155gn jacketed bullets and 800X, manual max loads range from 9.5gn (1296fps) to 9.8gn (1350 fps).
Now, if all you care about is velocity, you need a slower powder or, maybe 800X is too slow (2400 certainly is). The "best" powders, based on velocity in manuals, are AA9 (slower than 800X), AA7 (very close to 800X burn rate), and Blue Dot (slower than 800X).
Bullet Weight Powder Weight Velocity Start/Max PowerFactor
Sie JHP 150 800X 7.0 1029 Start 154
Sie JHP 150 800X 9.0 1301 Max 195
Sie JHP 150 800X 9.5 1301 NearMax/Acc. 195
JHP 150 AA7 11.7 1236 Start 185
Sie JHP 150 AA7 11.7 1236 185
Nos JHP 150 AA7 11.7 1253 188
Nos JHP 150 AA7 12.2 1306 196
Sie JHP 150 AA7 12.5 1290 NearMax 194
Sie JHP 150 AA7 12.6 1390 Accurate 209
Nos JHP 150 AA7 12.7 1358 Max 204
JHP 150 AA7 13.0 1326 Max 199
Nos JHP 150 AA7 13.0 1326 Max 199
JHP 150 AA7 13.0 1405 Max 211
Sie JHP 150 AA7 13.0 1405 Start 211
Sie JHP 150 AA7 13.0 1420 Accurate 213
Sie JHP 150 AA7 13.6 1440 Accurate 216
Nos JHP 150 AA7 14.2 1358 Start 204
Nos JHP 150 AA7 15.8 1543 Max 231
JHP 150 AA9 15.0 1284 Start 193
Nos JHP 150 AA9 16.7 1443 Start 216
JHP 150 AA9 16.7 1459 Max 219
Nos JHP 150 AA9 18.6 1640 Max 246
Nos JHP 150 Blue Dot 10.2 1148 Start 172
Sie JHP 150 Blue Dot 10.5 1265 Start 190
Nos JHP 150 Blue Dot 10.7 1220 183
Sie JHP 150 Blue Dot 11.0 1307 NearMax 196
Nos JHP 150 Blue Dot 11.2 1292 Max 194
JHP 150 HS7 9.5 1130 Start 170
Sie JHP 150 HS7 10.3 1170 Accurate 176
Sie JHP 150 HS7 10.8 1220 Accurate 183
Sie JHP 150 HS7 11.4 1260 Accurate 189
JHP 150 HS7 11.4 1330 Max 200
JHP 150 Power Pistol 8.7 Start 0
JHP 150 Power Pistol 9.2 1332 Accurate 200
Nos JHP 150 Power Pistol 9.7 1347 202
JHP 150 Power Pistol 9.7 1415 Max 212
Sie JHP 150 Silhouette 8.7 1290 Start 194
Sie JHP 150 Silhouette 9.8 1395 Max 209
JHP 150 Silhouette 10.0 1406 211
Sie JHP 150 SR4756 9.5 1276 NearMax/Acc. 191

[Bang]

It helps to know by what barrel Underwood achieved their stated FPS. And what barrel was used to record results for the reloading tables. Then consider how your barrel measures up.

[coat4gun]

Lots of good 10mm info on this site. Pull down specs will discribe exacly what Underwood and others are loading. http://10mm-firearms.com/index.php

[Edg]

>Firstly i just ordered 1000 new starline 10mm brass, do i need to size it before the first loading?

Do you wash plates and glasses after you buy them or do you assume they are clean?
Remember, they have been tossed into bins and tossed into boxes and weighed and poured into boxes.
So, how much trouble is it to size them to ensure they will chamber?
I always size cases before loading, virgin or used.

>Secondly im trying to load to near underwood FPS, all the load data is coming up about 100 fps less then they are getting, are they going over max load or is there another trick. Ill be loading the nosler 150gr. Ive read they use 800x powder, but the max load for that is listed at 1400fps, underwood advertises 1500fps and my chrono backs that up? Any advise before i break some of theirs down and weigh the charge?

Why? If you want a magnum, there are better options.
You may have READ they use 800X, but they may also be using a non-cannister grade of 800X or some other entirely different powder that you can't buy. Then, a max load in a manual only means that it was a max load with the exact lot number of bullets, cases, primers, and powder they used, at the COL they used, using the gun they used. That load will almost certainly be over- or under-max in your gun with your components. You don't even know if the Underwood load is actually battering your gun and will cause problems over time.
For 155gn jacketed bullets and 800X, manual max loads range from 9.5gn (1296fps) to 9.8gn (1350 fps).
Now, if all you care about is velocity, you need a slower powder or, maybe 800X is too slow (2400 certainly is). The "best" powders, based on velocity in manuals, are AA9 (slower than 800X), AA7 (very close to 800X burn rate), and Blue Dot (slower than 800X).
Bullet Weight Powder Weight Velocity Start/Max PowerFactor
Sie JHP 150 800X 7.0 1029 Start 154
Sie JHP 150 800X 9.0 1301 Max 195
Sie JHP 150 800X 9.5 1301 NearMax/Acc. 195
JHP 150 AA7 11.7 1236 Start 185
Sie JHP 150 AA7 11.7 1236 185
Nos JHP 150 AA7 11.7 1253 188
Nos JHP 150 AA7 12.2 1306 196
Sie JHP 150 AA7 12.5 1290 NearMax 194
Sie JHP 150 AA7 12.6 1390 Accurate 209
Nos JHP 150 AA7 12.7 1358 Max 204
JHP 150 AA7 13.0 1326 Max 199
Nos JHP 150 AA7 13.0 1326 Max 199
JHP 150 AA7 13.0 1405 Max 211
Sie JHP 150 AA7 13.0 1405 Start 211
Sie JHP 150 AA7 13.0 1420 Accurate 213
Sie JHP 150 AA7 13.6 1440 Accurate 216
Nos JHP 150 AA7 14.2 1358 Start 204
Nos JHP 150 AA7 15.8 1543 Max 231
JHP 150 AA9 15.0 1284 Start 193
Nos JHP 150 AA9 16.7 1443 Start 216
JHP 150 AA9 16.7 1459 Max 219
Nos JHP 150 AA9 18.6 1640 Max 246
Nos JHP 150 Blue Dot 10.2 1148 Start 172
Sie JHP 150 Blue Dot 10.5 1265 Start 190
Nos JHP 150 Blue Dot 10.7 1220 183
Sie JHP 150 Blue Dot 11.0 1307 NearMax 196
Nos JHP 150 Blue Dot 11.2 1292 Max 194
JHP 150 HS7 9.5 1130 Start 170
Sie JHP 150 HS7 10.3 1170 Accurate 176
Sie JHP 150 HS7 10.8 1220 Accurate 183
Sie JHP 150 HS7 11.4 1260 Accurate 189
JHP 150 HS7 11.4 1330 Max 200
JHP 150 Power Pistol 8.7 Start 0
JHP 150 Power Pistol 9.2 1332 Accurate 200
Nos JHP 150 Power Pistol 9.7 1347 202
JHP 150 Power Pistol 9.7 1415 Max 212
Sie JHP 150 Silhouette 8.7 1290 Start 194
Sie JHP 150 Silhouette 9.8 1395 Max 209
JHP 150 Silhouette 10.0 1406 211
Sie JHP 150 SR4756 9.5 1276 NearMax/Acc. 191

Thanks, Im going to go with the aa9. I looked up the data on their site and it appears ill have no problem reaching 1500fps with way less then max load.
Nos JHP 150 AA9 16.7 1443 Start 216
Nos JHP 150 AA9 18.6 1640 Max 246
Think ill start with about 17.2
Ill be firing these out of all three sizes Glock 29, 20 and 40mos. Which im pretty sure will destroy the brass no matter how i load them, but buying the components and loading myself is still about half the price of buying from UA.

[Edg]

my reloading experience is limited to a few thousand 5.56 rounds, some .243, and four hundred or so .480 ruger.
These will be my first Auto pistol rounds.

[39flathead]

Thanks, Im going to go with the aa9. I looked up the data on their site and it appears ill have no problem reaching 1500fps with way less then max load.
Nos JHP 150 AA9 16.7 1443 Start 216
Nos JHP 150 AA9 18.6 1640 Max 246
Think ill start with about 17.2
Ill be firing these out of all three sizes Glock 29, 20 and 40mos. Which im pretty sure will destroy the brass no matter how i load them, but buying the components and loading myself is still about half the price of buying from UA.

Are you attempting to perform a torture test on your Glocks?

Just wondering why one would want to put max loading after max loading through their guns.
Many times max velocity will generate poor accuracy.
Or are you just loading 1000 self defense rounds?

Most people reload to create accurate target loads, not punish their firearms.