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gwillis6
08-05-2010, 17:30
Been working my way up to a nice defense load using Longshot. Currently 9.5 gn. Longshot, 180 gn. XTP, 1.260" COL, WLP, Starline & PMC once fired brass with no signs of overpressure whatsoever. I was wondering if anybody has loaded this recipe using 9.8 gn. or more of Longshot? I am trying to get the most out of my G29's short barrel.

Meathead9
08-05-2010, 18:42
I don't know if this helps, but all the actual posted Longshot data I have read suggests a diminishing return with anything over 9.2-9.3gr. The velocities don't vary much when loaded above 9.2gr. I loaded all the way up to 9.5gr with no signs of pressure as well, but since I don't have a chrono, I keep all my 180gr loads at 9.2gr. I'd be very interested in the results if you decide to develop that load though.

jeffreybehr
08-05-2010, 23:46
Been working my way up to a nice defense load using Longshot.

IMO it won't be 'nice', unless nice includes BRIGHT and GLOWING. Longshot has a lot of muzzleflash and I wouldn't use it for a PD load.
http://i89.photobucket.com/albums/k220/jeffreybehr/Muzzleflash/10mmLongshot2_2000wwtext_800w.jpg

800X, either.
http://i89.photobucket.com/albums/k220/jeffreybehr/Muzzleflash/10mm800X3_2000wwtext_800w.jpg

I now use SR4756. Accurate 7 and 9 would also be good choices.

http://jeffreybehr.zenfolio.com/p548446203

gwillis6
08-06-2010, 06:01
I now use SR4756. Accurate 7 and 9 would also be good choices.

What kind of velocities are you getting with these powders? I did quite a bit of research before choosing Longshot and I found it to achive the best velocities with lowest pressures.

Keoking
08-06-2010, 06:19
I wish I had my reloading notes handy. Longshot is my main powder for 10mm target loads (180gr FMJ) and wake-up-the-range loads (various 135gr).
At 180gr, I carefully worked my way over 9.5gr until I started to see pressure signs (flattened primers). I don't recall how high I went, though. I was using a KKM barrel. If I'd been crazy enough to use the stock barrel, I would have seen the bulge and stopped before I made it to the flattened primers.

jeffreybehr
08-06-2010, 11:44
What kind of velocities are you getting with these powders? I did quite a bit of research before choosing Longshot and I found it to achive the best velocities with lowest pressures.

Velocities for the loads I fotografed are posted on the pics.
http://jeffreybehr.zenfolio.com/p548446203

I bought 8 pounds of LS for my .40 for the same reason, but then I switched to Universal for my .40-cal. PD loads.

steve4102
08-08-2010, 08:13
I don't know if this helps, but all the actual posted Longshot data I have read suggests a diminishing return with anything over 9.2-9.3gr. The velocities don't vary much when loaded above 9.2gr. I loaded all the way up to 9.5gr with no signs of pressure as well, but since I don't have a chrono, I keep all my 180gr loads at 9.2gr. I'd be very interested in the results if you decide to develop that load though.

This is exactly what I found with Longshot. With 180gr bullets 9.2gr was max as far as velocity goes. Anything over 9.2 and my velocities dropped. I like it though, 9.2gr of Longshot with 180gr JHP is running in the high 1200 in my pistols.

gwillis6
08-09-2010, 13:57
I don't know if this helps, but all the actual posted Longshot data I have read suggests a diminishing return with anything over 9.2-9.3gr. The velocities don't vary much when loaded above 9.2gr. I loaded all the way up to 9.5gr with no signs of pressure as well, but since I don't have a chrono, I keep all my 180gr loads at 9.2gr. I'd be very interested in the results if you decide to develop that load though.

I have heard that velocity with longshot does not increase over 9.4 as well. I got +15 fps. average from 9.4 to 9.5 so I am going to load a few batches of five:

9.6
9.7
9.8
9.9
10.0

I'll observe for overpressure signs and bring the chronograph with me and post results.

gwillis6
08-09-2010, 13:59
This is exactly what I found with Longshot. With 180gr bullets 9.2gr was max as far as velocity goes. Anything over 9.2 and my velocities dropped. I like it though, 9.2gr of Longshot with 180gr JHP is running in the high 1200 in my pistols.

did you go over 9.5? If so did you gain any velocity? You might just have saved me some time and $$ if you have already done this.

steve4102
08-10-2010, 06:23
I did not go over 9.5gr with 180gr.

gwillis6
08-10-2010, 13:51
I did not go over 9.5gr with 180gr.

I'm heading out to the range today. I'll let you know what I get for velocities.

LexDiamonds
08-10-2010, 20:16
Looking forward to your results gwillis. I am about to work up a longshot load w/ 180grainers and am interested in 9.0-10.0g data. Shooting out of a BarSto, and wanting 180@1300fps.

HiredGun77
08-11-2010, 02:33
Velocities for the loads I fotografed are posted on the pics.
http://jeffreybehr.zenfolio.com/p548446203

I bought 8 pounds of LS for my .40 for the same reason, but then I switched to Universal for my .40-cal. PD loads.


Nice pictures and your results were as expected for LongShot. The reason you were getting such a large flash in your 10mm LongShot load is the 155 grain bullet is too light to burn all the powder in the barrel with this slow powder in this large of case. I use 9.4 grains of LongShot with 180 grain XTP's to get 1325 fps and I get no flash visible from the firing position. Were you using magnum primers? They are recommended for LongShot.

In my G20 with the factory barrel, I started getting smilies at 9.5 at 1350fps at the rate of about 1 out of 5. It will go a lot faster and handle a bit more powder. I don't know who said it won't go faster as it goes right on up. I never tried any more than 9.6 grains as it was bulging 2 out of 5 in the stock barrel. I switched to a Lone Wolf barrel and no more bulges but this barrel isn't as fast as the Glock barrel. I recently started using a Dillon so I backed up the load to 9.4 for safety and it clocks 1325 in the Lone Wolf barrel.


My magic 10mm Load was given to me by Mike McNett from Double Tap a couple years ago.

180 grain XTP
Starline Brass
9.4 grains of LongShot. He actually used 9.5 to get his advertised 1350fps. I backed it down just to add a small margin of safety.
CCI-350 primer
1.260" OAL

This is my go to load for 10mm. It yields 1325 fps and 702fpe but don't recommend it in the stock barrel. I like it for how clean and powerful it burns with minimal pressure and almost no visible muzzle flash.

I just looked and noticed Mike is no longer selling this load so he may have concluded the same thing I did is is was a bit hot for the factory barrel. It is perfectly safe in the Lone Wolf barrel. Accuracy is excellent. On a good eye day I can hit clay pigeons pretty regularly at 100 yards.

I love LongShot and use it exclusively for all my auto pistol needs 9mm, 357Sig, 40S&W and 10mm.

My 155XTP LongShot load is a huge success with almost no flash and extremely clean burning while providing over 500FPE out of a G23. I sell the heck out of this load.

gwillis6
08-11-2010, 19:12
My velocities went up:

180 grain XTP
Once fired Starline & PMC brass
Longshot powder
WLP primers
1.260" OAL


9.5 1248
9.6 1254
9.7 1261
9.8 1266

These were the high velocities shot from my G29. I had no smilies or flattened primers or any other overpressure signs although the brass was flying a good 15 feet. My G29 is only a month or so old and I don't know if Glock has improved the chamber support any although it seems as though they may have. I'll try 9.9 and 10.0 on my next trip to the range. I'm extremely happy with Longshot and I'm not sure how much more I may get with true magnum primers...maybe I'll try CCI-350's next time (if i can find em'). Good luck!

gwillis6
08-15-2010, 08:14
While I am happy with the velocities I have got so far, I think I may be able to increase velocity while decreasing the powder charge weight. I picked up some CCI 350 magnum primers yesterday. After reading much about these primers I think I'm gonna back it up to 9.2 grains of Longshot with these and see what knid of velocities I get and work on up from there. Hopefully the magnum primer will help to ignite more of the slower burning powder on it's trip out of the launch tube. I am going to the range Monday and I will post results.

From what I have read (see HiredGun77's post above) I should be able to get around 1250 fps from 9.4 grains of longshot with the mag primers and 180 XTP out of my G29. Has anyone experienced significant velocity increases switching from WLP to the CCI 350 or know what knid of increase I can expect?

Meathead9
08-15-2010, 10:58
From what I have read (see HiredGun77's post above) I should be able to get around 1250 fps from 9.4 grains of longshot with the mag primers and 180 XTP out of my G29. Has anyone experienced significant velocity increases switching from WLP to the CCI 350 or know what knid of increase I can expect?

You posted that you get 1248fps with WLP's @ 9.5gr, and that there was a 15fps drop with 9.4gr (1233fps), all with no pressure signs. If CCI350's @ 9.4gr are at 1250fps, that's not a very big difference. Unless the mag primers cut your ES in half or something, I don't see the point in switching. Unless it's just for the sake of experimenting ofcourse. If your groups are good, with WLP's @ 9.5gr (Hodgdon's listed max), I wouldn't change a thing.

I'm new to this, so pardon my ignorance if I'm missing something here...

gwillis6
08-15-2010, 16:30
You posted that you get 1248fps with WLP's @ 9.5gr, and that there was a 15fps drop with 9.4gr (1233fps), all with no pressure signs. If CCI350's @ 9.4gr are at 1250fps, that's not a very big difference. Unless the mag primers cut your ES in half or something, I don't see the point in switching. Unless it's just for the sake of experimenting ofcourse. If your groups are good, with WLP's @ 9.5gr (Hodgdon's listed max), I wouldn't change a thing.

I'm new to this, so pardon my ignorance if I'm missing something here...

I am more experimenting than anything. I am very happy with the results so far. I just think that maybe with the magnum primers I can get even more velocity without going into the 9.8 grain territory again as more powder will be burnt before it leaves the short barrel. Longshot is a relatively slow burning powder. I would really like 1300 fps or so with 9.6 grains. I have just finished loading five each from 9.2 to 9.8....we'll see.

gwillis6
08-18-2010, 11:27
Well I made it to the range yesterday and found out the magnum primers (CCI 350) gave me 50-100 more FPS with a given powder charge vs. Winchester WLP primers. I do not have pressure testing capabilities so I do not know for sure what the difference is in pressure but I found no overpressure signs going all the way up to 10 grains of Longshot which gave me 1295 fps out of my G29. :supergrin:

HiredGun77
08-18-2010, 13:29
How many rounds did you fire at 10 grains?
This is assuming 180 grain bullets,
Longshot powder,
Starline brass,
CCI-350
OAL at 1.260"
Please correct or confirm and then what was your actual final ave speed and ES figures.

gwillis6
08-18-2010, 16:10
Now that I found my notes.

180 grain XTP
Longshot powder
CCI 350 primers
PMC brass (once fired)
OAL 1.260"
G29

Shooting Chrony F1
five shot average:

9.2 1240
9.4 1250
9.6 1265
9.8 1280
10.0 1295

My chrony does not do all the fancy stuff, simply velocity, so averages are my math. There were no overpressure signs at all...no flattened primers, Glock smiles or abnormal case bulges. These loads were weighed by hand. I could not be happier with the results.

Meathead9
08-19-2010, 09:40
Thanks for the load development data. I wasn't too sure about the use of Mag Primers, but I'm starting to see the light.

gwillis6
08-19-2010, 10:14
The biggest surprise was being able to hit 10 grains and almost 1300 fps with no overpressure signs from my standard G29 barrel. I am a happy camper. :supergrin:

_The_Shadow
08-19-2010, 15:32
Gwillis6, which Chrono do you have...Is it a Shooting Chrony? If Yes...Does it have a 3.5mm RCA port located some where on it!

If it has this port you can make a switch to access the functions of Velocity, Hi, Lo, Adv, SD, ED of a string.
Check these links to see...
http://forums.handloads.com/forum_posts.asp?TID=8020&PN=1&TPN=2

http://forums.handloads.com/forum_posts.asp?TID=15669&KW=chrony+switch

gwillis6
08-20-2010, 07:30
Gwillis6, which Chrono do you have...Is it a Shooting Chrony? If Yes...Does it have a 3.5mm RCA port located some where on it!

If it has this port you can make a switch to access the functions of Velocity, Hi, Lo, Adv, SD, ED of a string.
Check these links to see...
http://forums.handloads.com/forum_posts.asp?TID=8020&PN=1&TPN=2

http://forums.handloads.com/forum_posts.asp?TID=15669&KW=chrony+switch


Thanks a million for those links. It does have the RCA jack and someone at a gun show once told me that could be done but I was skeptical. I now have another project for the weekend.